+
+
+
+
+
+⬇️🏷️ Download all the metadata for Example dataset for RO-Crate specification in JSON-LD format
+
+
+
+
+
+
+
+
+
+
+Example dataset for RO-Crate specification
+
+
+⬇️🏷️ Download all the metadata for Example dataset for RO-Crate specification in JSON-LD format
+
+
+
+
+
+
+
+
+
+
+
+
+ +
`; + + } + } + } + } + } else if ( types.includes("File") || types.includes("ImageObject") || types.includes("MediaObject") || path === "ro-crate-metadata.jsonld"){ + view = "⬇️ Download: "; + } + if (view){ + idLink += `${view}`; + } + return `
`;
+ }
+ }
+ return image;
+ }
+ articleBody(item) {
+ // See if there are any fragments to display - if there are references to things which have
+ // articleBody but no name (for lab notebook display)
+ var articleBody = ""
+ for (let part of this.crate.utils.asArray(item.hasPart)) {
+ const p = this.crate.getItem(part["@id"]);
+ if (p && this.crate.utils.asArray(p["@type"]).includes("Article") && p.articleBody) {
+ for (let b of this.crate.utils.asArray(p.articleBody))
+ {
+ articleBody += `
`
+ }
+ }
+ }
+ return articleBody;
+ }
+
+ script() {
+ const url = this.config.renderScript || this.crate.defaults.render_script;
+ return ``
+ }
+ previews(item, dontShowPreviews) {
+ var p = `${item["@id"]}`;
+ if (this.config.utils) {
+ p = this.config.utils.getImagePath(this.baseID, p)
+ }
+
+
+
+ var previews = "";
+ var types = this.crate.utils.asArray(item["@type"]);
+ if (!dontShowPreviews && (types.includes("Dataset") || types.includes("File") ||types.includes("ImageObject") ||types.includes("MediaObject"))) {
+ if (p.match(/(\.txt$)|(\.html?$)/i)){
+ previews += ``;
+ } else if (p.match(/(\.mp3)|(\.ogg?)|(\.wav)$/i)){
+ previews += ``;
+ } else if (p.match(/(\.jpe?g)|(\.png)$/i)){
+ previews += `
`;
+ }
+ else if (p.match(/pdf$/i)){
+ previews += ``;
+
+ }
+ }
+ return previews;
+ }
+
+ metaTable(it, showName) {
+ // Generate a "table" (or other structure)
+ const item = _.clone(it);
+ var name = "";
+ if (showName) {
+ name = `Items that reference this one `;
+ for (let prop of Object.keys(item["@reverse"])) {
+ rows += this.metadataRow(item["@reverse"], prop);
+
+ }
+ }
+ return `
+
+ ${propName}
+ ${this.displayValues(item[prop])}
+ `;
+ }
+
+ displayValuesAsString(v) {
+ const vals = this.crate.utils.asArray(v);
+ var html = "";
+ for (v of vals) {
+ html += this.displayValue(v);
+ }
+ return html;
+}
+
+ displayValues(v) {
+ const vals = this.crate.utils.asArray(v);
+ const page = new Page({values: vals, pageSize: this.defaults.pageSize});
+ return this.displayPage(page);
+}
+
+
+displayPage(page) {
+ var html = "";
+ if (page.pages.length > 0) {
+ for (let p of page.pages) {
+ if (p.first && p.last) {
+ html += `
+
+ * MIT Licensed
+ */
+
+/*!
+ * Return a function that will copy properties from
+ * one object to another excluding any originally
+ * listed. Returned function will create a new `{}`.
+ *
+ * @param {String} excluded properties ...
+ * @return {Function}
+ */
+
+function exclude () {
+ var excludes = [].slice.call(arguments);
+
+ function excludeProps (res, obj) {
+ Object.keys(obj).forEach(function (key) {
+ if (!~excludes.indexOf(key)) res[key] = obj[key];
+ });
+ }
+
+ return function extendExclude () {
+ var args = [].slice.call(arguments)
+ , i = 0
+ , res = {};
+
+ for (; i < args.length; i++) {
+ excludeProps(res, args[i]);
+ }
+
+ return res;
+ };
+};
+
+/*!
+ * Primary Exports
+ */
+
+module.exports = AssertionError;
+
+/**
+ * ### AssertionError
+ *
+ * An extension of the JavaScript `Error` constructor for
+ * assertion and validation scenarios.
+ *
+ * @param {String} message
+ * @param {Object} properties to include (optional)
+ * @param {callee} start stack function (optional)
+ */
+
+function AssertionError (message, _props, ssf) {
+ var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
+ , props = extend(_props || {});
+
+ // default values
+ this.message = message || 'Unspecified AssertionError';
+ this.showDiff = false;
+
+ // copy from properties
+ for (var key in props) {
+ this[key] = props[key];
+ }
+
+ // capture stack trace
+ ssf = ssf || AssertionError;
+ if (Error.captureStackTrace) {
+ Error.captureStackTrace(this, ssf);
+ } else {
+ try {
+ throw new Error();
+ } catch(e) {
+ this.stack = e.stack;
+ }
+ }
+}
+
+/*!
+ * Inherit from Error.prototype
+ */
+
+AssertionError.prototype = Object.create(Error.prototype);
+
+/*!
+ * Statically set name
+ */
+
+AssertionError.prototype.name = 'AssertionError';
+
+/*!
+ * Ensure correct constructor
+ */
+
+AssertionError.prototype.constructor = AssertionError;
+
+/**
+ * Allow errors to be converted to JSON for static transfer.
+ *
+ * @param {Boolean} include stack (default: `true`)
+ * @return {Object} object that can be `JSON.stringify`
+ */
+
+AssertionError.prototype.toJSON = function (stack) {
+ var extend = exclude('constructor', 'toJSON', 'stack')
+ , props = extend({ name: this.name }, this);
+
+ // include stack if exists and not turned off
+ if (false !== stack && this.stack) {
+ props.stack = this.stack;
+ }
+
+ return props;
+};
+
+},{}],6:[function(require,module,exports){
+module.exports = require('./lib/axios');
+},{"./lib/axios":8}],7:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+var settle = require('./../core/settle');
+var cookies = require('./../helpers/cookies');
+var buildURL = require('./../helpers/buildURL');
+var buildFullPath = require('../core/buildFullPath');
+var parseHeaders = require('./../helpers/parseHeaders');
+var isURLSameOrigin = require('./../helpers/isURLSameOrigin');
+var createError = require('../core/createError');
+
+module.exports = function xhrAdapter(config) {
+ return new Promise(function dispatchXhrRequest(resolve, reject) {
+ var requestData = config.data;
+ var requestHeaders = config.headers;
+
+ if (utils.isFormData(requestData)) {
+ delete requestHeaders['Content-Type']; // Let the browser set it
+ }
+
+ var request = new XMLHttpRequest();
+
+ // HTTP basic authentication
+ if (config.auth) {
+ var username = config.auth.username || '';
+ var password = config.auth.password ? unescape(encodeURIComponent(config.auth.password)) : '';
+ requestHeaders.Authorization = 'Basic ' + btoa(username + ':' + password);
+ }
+
+ var fullPath = buildFullPath(config.baseURL, config.url);
+ request.open(config.method.toUpperCase(), buildURL(fullPath, config.params, config.paramsSerializer), true);
+
+ // Set the request timeout in MS
+ request.timeout = config.timeout;
+
+ // Listen for ready state
+ request.onreadystatechange = function handleLoad() {
+ if (!request || request.readyState !== 4) {
+ return;
+ }
+
+ // The request errored out and we didn't get a response, this will be
+ // handled by onerror instead
+ // With one exception: request that using file: protocol, most browsers
+ // will return status as 0 even though it's a successful request
+ if (request.status === 0 && !(request.responseURL && request.responseURL.indexOf('file:') === 0)) {
+ return;
+ }
+
+ // Prepare the response
+ var responseHeaders = 'getAllResponseHeaders' in request ? parseHeaders(request.getAllResponseHeaders()) : null;
+ var responseData = !config.responseType || config.responseType === 'text' ? request.responseText : request.response;
+ var response = {
+ data: responseData,
+ status: request.status,
+ statusText: request.statusText,
+ headers: responseHeaders,
+ config: config,
+ request: request
+ };
+
+ settle(resolve, reject, response);
+
+ // Clean up request
+ request = null;
+ };
+
+ // Handle browser request cancellation (as opposed to a manual cancellation)
+ request.onabort = function handleAbort() {
+ if (!request) {
+ return;
+ }
+
+ reject(createError('Request aborted', config, 'ECONNABORTED', request));
+
+ // Clean up request
+ request = null;
+ };
+
+ // Handle low level network errors
+ request.onerror = function handleError() {
+ // Real errors are hidden from us by the browser
+ // onerror should only fire if it's a network error
+ reject(createError('Network Error', config, null, request));
+
+ // Clean up request
+ request = null;
+ };
+
+ // Handle timeout
+ request.ontimeout = function handleTimeout() {
+ var timeoutErrorMessage = 'timeout of ' + config.timeout + 'ms exceeded';
+ if (config.timeoutErrorMessage) {
+ timeoutErrorMessage = config.timeoutErrorMessage;
+ }
+ reject(createError(timeoutErrorMessage, config, 'ECONNABORTED',
+ request));
+
+ // Clean up request
+ request = null;
+ };
+
+ // Add xsrf header
+ // This is only done if running in a standard browser environment.
+ // Specifically not if we're in a web worker, or react-native.
+ if (utils.isStandardBrowserEnv()) {
+ // Add xsrf header
+ var xsrfValue = (config.withCredentials || isURLSameOrigin(fullPath)) && config.xsrfCookieName ?
+ cookies.read(config.xsrfCookieName) :
+ undefined;
+
+ if (xsrfValue) {
+ requestHeaders[config.xsrfHeaderName] = xsrfValue;
+ }
+ }
+
+ // Add headers to the request
+ if ('setRequestHeader' in request) {
+ utils.forEach(requestHeaders, function setRequestHeader(val, key) {
+ if (typeof requestData === 'undefined' && key.toLowerCase() === 'content-type') {
+ // Remove Content-Type if data is undefined
+ delete requestHeaders[key];
+ } else {
+ // Otherwise add header to the request
+ request.setRequestHeader(key, val);
+ }
+ });
+ }
+
+ // Add withCredentials to request if needed
+ if (!utils.isUndefined(config.withCredentials)) {
+ request.withCredentials = !!config.withCredentials;
+ }
+
+ // Add responseType to request if needed
+ if (config.responseType) {
+ try {
+ request.responseType = config.responseType;
+ } catch (e) {
+ // Expected DOMException thrown by browsers not compatible XMLHttpRequest Level 2.
+ // But, this can be suppressed for 'json' type as it can be parsed by default 'transformResponse' function.
+ if (config.responseType !== 'json') {
+ throw e;
+ }
+ }
+ }
+
+ // Handle progress if needed
+ if (typeof config.onDownloadProgress === 'function') {
+ request.addEventListener('progress', config.onDownloadProgress);
+ }
+
+ // Not all browsers support upload events
+ if (typeof config.onUploadProgress === 'function' && request.upload) {
+ request.upload.addEventListener('progress', config.onUploadProgress);
+ }
+
+ if (config.cancelToken) {
+ // Handle cancellation
+ config.cancelToken.promise.then(function onCanceled(cancel) {
+ if (!request) {
+ return;
+ }
+
+ request.abort();
+ reject(cancel);
+ // Clean up request
+ request = null;
+ });
+ }
+
+ if (!requestData) {
+ requestData = null;
+ }
+
+ // Send the request
+ request.send(requestData);
+ });
+};
+
+},{"../core/buildFullPath":14,"../core/createError":15,"./../core/settle":19,"./../helpers/buildURL":23,"./../helpers/cookies":25,"./../helpers/isURLSameOrigin":28,"./../helpers/parseHeaders":30,"./../utils":32}],8:[function(require,module,exports){
+'use strict';
+
+var utils = require('./utils');
+var bind = require('./helpers/bind');
+var Axios = require('./core/Axios');
+var mergeConfig = require('./core/mergeConfig');
+var defaults = require('./defaults');
+
+/**
+ * Create an instance of Axios
+ *
+ * @param {Object} defaultConfig The default config for the instance
+ * @return {Axios} A new instance of Axios
+ */
+function createInstance(defaultConfig) {
+ var context = new Axios(defaultConfig);
+ var instance = bind(Axios.prototype.request, context);
+
+ // Copy axios.prototype to instance
+ utils.extend(instance, Axios.prototype, context);
+
+ // Copy context to instance
+ utils.extend(instance, context);
+
+ return instance;
+}
+
+// Create the default instance to be exported
+var axios = createInstance(defaults);
+
+// Expose Axios class to allow class inheritance
+axios.Axios = Axios;
+
+// Factory for creating new instances
+axios.create = function create(instanceConfig) {
+ return createInstance(mergeConfig(axios.defaults, instanceConfig));
+};
+
+// Expose Cancel & CancelToken
+axios.Cancel = require('./cancel/Cancel');
+axios.CancelToken = require('./cancel/CancelToken');
+axios.isCancel = require('./cancel/isCancel');
+
+// Expose all/spread
+axios.all = function all(promises) {
+ return Promise.all(promises);
+};
+axios.spread = require('./helpers/spread');
+
+// Expose isAxiosError
+axios.isAxiosError = require('./helpers/isAxiosError');
+
+module.exports = axios;
+
+// Allow use of default import syntax in TypeScript
+module.exports.default = axios;
+
+},{"./cancel/Cancel":9,"./cancel/CancelToken":10,"./cancel/isCancel":11,"./core/Axios":12,"./core/mergeConfig":18,"./defaults":21,"./helpers/bind":22,"./helpers/isAxiosError":27,"./helpers/spread":31,"./utils":32}],9:[function(require,module,exports){
+'use strict';
+
+/**
+ * A `Cancel` is an object that is thrown when an operation is canceled.
+ *
+ * @class
+ * @param {string=} message The message.
+ */
+function Cancel(message) {
+ this.message = message;
+}
+
+Cancel.prototype.toString = function toString() {
+ return 'Cancel' + (this.message ? ': ' + this.message : '');
+};
+
+Cancel.prototype.__CANCEL__ = true;
+
+module.exports = Cancel;
+
+},{}],10:[function(require,module,exports){
+'use strict';
+
+var Cancel = require('./Cancel');
+
+/**
+ * A `CancelToken` is an object that can be used to request cancellation of an operation.
+ *
+ * @class
+ * @param {Function} executor The executor function.
+ */
+function CancelToken(executor) {
+ if (typeof executor !== 'function') {
+ throw new TypeError('executor must be a function.');
+ }
+
+ var resolvePromise;
+ this.promise = new Promise(function promiseExecutor(resolve) {
+ resolvePromise = resolve;
+ });
+
+ var token = this;
+ executor(function cancel(message) {
+ if (token.reason) {
+ // Cancellation has already been requested
+ return;
+ }
+
+ token.reason = new Cancel(message);
+ resolvePromise(token.reason);
+ });
+}
+
+/**
+ * Throws a `Cancel` if cancellation has been requested.
+ */
+CancelToken.prototype.throwIfRequested = function throwIfRequested() {
+ if (this.reason) {
+ throw this.reason;
+ }
+};
+
+/**
+ * Returns an object that contains a new `CancelToken` and a function that, when called,
+ * cancels the `CancelToken`.
+ */
+CancelToken.source = function source() {
+ var cancel;
+ var token = new CancelToken(function executor(c) {
+ cancel = c;
+ });
+ return {
+ token: token,
+ cancel: cancel
+ };
+};
+
+module.exports = CancelToken;
+
+},{"./Cancel":9}],11:[function(require,module,exports){
+'use strict';
+
+module.exports = function isCancel(value) {
+ return !!(value && value.__CANCEL__);
+};
+
+},{}],12:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+var buildURL = require('../helpers/buildURL');
+var InterceptorManager = require('./InterceptorManager');
+var dispatchRequest = require('./dispatchRequest');
+var mergeConfig = require('./mergeConfig');
+
+/**
+ * Create a new instance of Axios
+ *
+ * @param {Object} instanceConfig The default config for the instance
+ */
+function Axios(instanceConfig) {
+ this.defaults = instanceConfig;
+ this.interceptors = {
+ request: new InterceptorManager(),
+ response: new InterceptorManager()
+ };
+}
+
+/**
+ * Dispatch a request
+ *
+ * @param {Object} config The config specific for this request (merged with this.defaults)
+ */
+Axios.prototype.request = function request(config) {
+ /*eslint no-param-reassign:0*/
+ // Allow for axios('example/url'[, config]) a la fetch API
+ if (typeof config === 'string') {
+ config = arguments[1] || {};
+ config.url = arguments[0];
+ } else {
+ config = config || {};
+ }
+
+ config = mergeConfig(this.defaults, config);
+
+ // Set config.method
+ if (config.method) {
+ config.method = config.method.toLowerCase();
+ } else if (this.defaults.method) {
+ config.method = this.defaults.method.toLowerCase();
+ } else {
+ config.method = 'get';
+ }
+
+ // Hook up interceptors middleware
+ var chain = [dispatchRequest, undefined];
+ var promise = Promise.resolve(config);
+
+ this.interceptors.request.forEach(function unshiftRequestInterceptors(interceptor) {
+ chain.unshift(interceptor.fulfilled, interceptor.rejected);
+ });
+
+ this.interceptors.response.forEach(function pushResponseInterceptors(interceptor) {
+ chain.push(interceptor.fulfilled, interceptor.rejected);
+ });
+
+ while (chain.length) {
+ promise = promise.then(chain.shift(), chain.shift());
+ }
+
+ return promise;
+};
+
+Axios.prototype.getUri = function getUri(config) {
+ config = mergeConfig(this.defaults, config);
+ return buildURL(config.url, config.params, config.paramsSerializer).replace(/^\?/, '');
+};
+
+// Provide aliases for supported request methods
+utils.forEach(['delete', 'get', 'head', 'options'], function forEachMethodNoData(method) {
+ /*eslint func-names:0*/
+ Axios.prototype[method] = function(url, config) {
+ return this.request(mergeConfig(config || {}, {
+ method: method,
+ url: url,
+ data: (config || {}).data
+ }));
+ };
+});
+
+utils.forEach(['post', 'put', 'patch'], function forEachMethodWithData(method) {
+ /*eslint func-names:0*/
+ Axios.prototype[method] = function(url, data, config) {
+ return this.request(mergeConfig(config || {}, {
+ method: method,
+ url: url,
+ data: data
+ }));
+ };
+});
+
+module.exports = Axios;
+
+},{"../helpers/buildURL":23,"./../utils":32,"./InterceptorManager":13,"./dispatchRequest":16,"./mergeConfig":18}],13:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+function InterceptorManager() {
+ this.handlers = [];
+}
+
+/**
+ * Add a new interceptor to the stack
+ *
+ * @param {Function} fulfilled The function to handle `then` for a `Promise`
+ * @param {Function} rejected The function to handle `reject` for a `Promise`
+ *
+ * @return {Number} An ID used to remove interceptor later
+ */
+InterceptorManager.prototype.use = function use(fulfilled, rejected) {
+ this.handlers.push({
+ fulfilled: fulfilled,
+ rejected: rejected
+ });
+ return this.handlers.length - 1;
+};
+
+/**
+ * Remove an interceptor from the stack
+ *
+ * @param {Number} id The ID that was returned by `use`
+ */
+InterceptorManager.prototype.eject = function eject(id) {
+ if (this.handlers[id]) {
+ this.handlers[id] = null;
+ }
+};
+
+/**
+ * Iterate over all the registered interceptors
+ *
+ * This method is particularly useful for skipping over any
+ * interceptors that may have become `null` calling `eject`.
+ *
+ * @param {Function} fn The function to call for each interceptor
+ */
+InterceptorManager.prototype.forEach = function forEach(fn) {
+ utils.forEach(this.handlers, function forEachHandler(h) {
+ if (h !== null) {
+ fn(h);
+ }
+ });
+};
+
+module.exports = InterceptorManager;
+
+},{"./../utils":32}],14:[function(require,module,exports){
+'use strict';
+
+var isAbsoluteURL = require('../helpers/isAbsoluteURL');
+var combineURLs = require('../helpers/combineURLs');
+
+/**
+ * Creates a new URL by combining the baseURL with the requestedURL,
+ * only when the requestedURL is not already an absolute URL.
+ * If the requestURL is absolute, this function returns the requestedURL untouched.
+ *
+ * @param {string} baseURL The base URL
+ * @param {string} requestedURL Absolute or relative URL to combine
+ * @returns {string} The combined full path
+ */
+module.exports = function buildFullPath(baseURL, requestedURL) {
+ if (baseURL && !isAbsoluteURL(requestedURL)) {
+ return combineURLs(baseURL, requestedURL);
+ }
+ return requestedURL;
+};
+
+},{"../helpers/combineURLs":24,"../helpers/isAbsoluteURL":26}],15:[function(require,module,exports){
+'use strict';
+
+var enhanceError = require('./enhanceError');
+
+/**
+ * Create an Error with the specified message, config, error code, request and response.
+ *
+ * @param {string} message The error message.
+ * @param {Object} config The config.
+ * @param {string} [code] The error code (for example, 'ECONNABORTED').
+ * @param {Object} [request] The request.
+ * @param {Object} [response] The response.
+ * @returns {Error} The created error.
+ */
+module.exports = function createError(message, config, code, request, response) {
+ var error = new Error(message);
+ return enhanceError(error, config, code, request, response);
+};
+
+},{"./enhanceError":17}],16:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+var transformData = require('./transformData');
+var isCancel = require('../cancel/isCancel');
+var defaults = require('../defaults');
+
+/**
+ * Throws a `Cancel` if cancellation has been requested.
+ */
+function throwIfCancellationRequested(config) {
+ if (config.cancelToken) {
+ config.cancelToken.throwIfRequested();
+ }
+}
+
+/**
+ * Dispatch a request to the server using the configured adapter.
+ *
+ * @param {object} config The config that is to be used for the request
+ * @returns {Promise} The Promise to be fulfilled
+ */
+module.exports = function dispatchRequest(config) {
+ throwIfCancellationRequested(config);
+
+ // Ensure headers exist
+ config.headers = config.headers || {};
+
+ // Transform request data
+ config.data = transformData(
+ config.data,
+ config.headers,
+ config.transformRequest
+ );
+
+ // Flatten headers
+ config.headers = utils.merge(
+ config.headers.common || {},
+ config.headers[config.method] || {},
+ config.headers
+ );
+
+ utils.forEach(
+ ['delete', 'get', 'head', 'post', 'put', 'patch', 'common'],
+ function cleanHeaderConfig(method) {
+ delete config.headers[method];
+ }
+ );
+
+ var adapter = config.adapter || defaults.adapter;
+
+ return adapter(config).then(function onAdapterResolution(response) {
+ throwIfCancellationRequested(config);
+
+ // Transform response data
+ response.data = transformData(
+ response.data,
+ response.headers,
+ config.transformResponse
+ );
+
+ return response;
+ }, function onAdapterRejection(reason) {
+ if (!isCancel(reason)) {
+ throwIfCancellationRequested(config);
+
+ // Transform response data
+ if (reason && reason.response) {
+ reason.response.data = transformData(
+ reason.response.data,
+ reason.response.headers,
+ config.transformResponse
+ );
+ }
+ }
+
+ return Promise.reject(reason);
+ });
+};
+
+},{"../cancel/isCancel":11,"../defaults":21,"./../utils":32,"./transformData":20}],17:[function(require,module,exports){
+'use strict';
+
+/**
+ * Update an Error with the specified config, error code, and response.
+ *
+ * @param {Error} error The error to update.
+ * @param {Object} config The config.
+ * @param {string} [code] The error code (for example, 'ECONNABORTED').
+ * @param {Object} [request] The request.
+ * @param {Object} [response] The response.
+ * @returns {Error} The error.
+ */
+module.exports = function enhanceError(error, config, code, request, response) {
+ error.config = config;
+ if (code) {
+ error.code = code;
+ }
+
+ error.request = request;
+ error.response = response;
+ error.isAxiosError = true;
+
+ error.toJSON = function toJSON() {
+ return {
+ // Standard
+ message: this.message,
+ name: this.name,
+ // Microsoft
+ description: this.description,
+ number: this.number,
+ // Mozilla
+ fileName: this.fileName,
+ lineNumber: this.lineNumber,
+ columnNumber: this.columnNumber,
+ stack: this.stack,
+ // Axios
+ config: this.config,
+ code: this.code
+ };
+ };
+ return error;
+};
+
+},{}],18:[function(require,module,exports){
+'use strict';
+
+var utils = require('../utils');
+
+/**
+ * Config-specific merge-function which creates a new config-object
+ * by merging two configuration objects together.
+ *
+ * @param {Object} config1
+ * @param {Object} config2
+ * @returns {Object} New object resulting from merging config2 to config1
+ */
+module.exports = function mergeConfig(config1, config2) {
+ // eslint-disable-next-line no-param-reassign
+ config2 = config2 || {};
+ var config = {};
+
+ var valueFromConfig2Keys = ['url', 'method', 'data'];
+ var mergeDeepPropertiesKeys = ['headers', 'auth', 'proxy', 'params'];
+ var defaultToConfig2Keys = [
+ 'baseURL', 'transformRequest', 'transformResponse', 'paramsSerializer',
+ 'timeout', 'timeoutMessage', 'withCredentials', 'adapter', 'responseType', 'xsrfCookieName',
+ 'xsrfHeaderName', 'onUploadProgress', 'onDownloadProgress', 'decompress',
+ 'maxContentLength', 'maxBodyLength', 'maxRedirects', 'transport', 'httpAgent',
+ 'httpsAgent', 'cancelToken', 'socketPath', 'responseEncoding'
+ ];
+ var directMergeKeys = ['validateStatus'];
+
+ function getMergedValue(target, source) {
+ if (utils.isPlainObject(target) && utils.isPlainObject(source)) {
+ return utils.merge(target, source);
+ } else if (utils.isPlainObject(source)) {
+ return utils.merge({}, source);
+ } else if (utils.isArray(source)) {
+ return source.slice();
+ }
+ return source;
+ }
+
+ function mergeDeepProperties(prop) {
+ if (!utils.isUndefined(config2[prop])) {
+ config[prop] = getMergedValue(config1[prop], config2[prop]);
+ } else if (!utils.isUndefined(config1[prop])) {
+ config[prop] = getMergedValue(undefined, config1[prop]);
+ }
+ }
+
+ utils.forEach(valueFromConfig2Keys, function valueFromConfig2(prop) {
+ if (!utils.isUndefined(config2[prop])) {
+ config[prop] = getMergedValue(undefined, config2[prop]);
+ }
+ });
+
+ utils.forEach(mergeDeepPropertiesKeys, mergeDeepProperties);
+
+ utils.forEach(defaultToConfig2Keys, function defaultToConfig2(prop) {
+ if (!utils.isUndefined(config2[prop])) {
+ config[prop] = getMergedValue(undefined, config2[prop]);
+ } else if (!utils.isUndefined(config1[prop])) {
+ config[prop] = getMergedValue(undefined, config1[prop]);
+ }
+ });
+
+ utils.forEach(directMergeKeys, function merge(prop) {
+ if (prop in config2) {
+ config[prop] = getMergedValue(config1[prop], config2[prop]);
+ } else if (prop in config1) {
+ config[prop] = getMergedValue(undefined, config1[prop]);
+ }
+ });
+
+ var axiosKeys = valueFromConfig2Keys
+ .concat(mergeDeepPropertiesKeys)
+ .concat(defaultToConfig2Keys)
+ .concat(directMergeKeys);
+
+ var otherKeys = Object
+ .keys(config1)
+ .concat(Object.keys(config2))
+ .filter(function filterAxiosKeys(key) {
+ return axiosKeys.indexOf(key) === -1;
+ });
+
+ utils.forEach(otherKeys, mergeDeepProperties);
+
+ return config;
+};
+
+},{"../utils":32}],19:[function(require,module,exports){
+'use strict';
+
+var createError = require('./createError');
+
+/**
+ * Resolve or reject a Promise based on response status.
+ *
+ * @param {Function} resolve A function that resolves the promise.
+ * @param {Function} reject A function that rejects the promise.
+ * @param {object} response The response.
+ */
+module.exports = function settle(resolve, reject, response) {
+ var validateStatus = response.config.validateStatus;
+ if (!response.status || !validateStatus || validateStatus(response.status)) {
+ resolve(response);
+ } else {
+ reject(createError(
+ 'Request failed with status code ' + response.status,
+ response.config,
+ null,
+ response.request,
+ response
+ ));
+ }
+};
+
+},{"./createError":15}],20:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+/**
+ * Transform the data for a request or a response
+ *
+ * @param {Object|String} data The data to be transformed
+ * @param {Array} headers The headers for the request or response
+ * @param {Array|Function} fns A single function or Array of functions
+ * @returns {*} The resulting transformed data
+ */
+module.exports = function transformData(data, headers, fns) {
+ /*eslint no-param-reassign:0*/
+ utils.forEach(fns, function transform(fn) {
+ data = fn(data, headers);
+ });
+
+ return data;
+};
+
+},{"./../utils":32}],21:[function(require,module,exports){
+(function (process){(function (){
+'use strict';
+
+var utils = require('./utils');
+var normalizeHeaderName = require('./helpers/normalizeHeaderName');
+
+var DEFAULT_CONTENT_TYPE = {
+ 'Content-Type': 'application/x-www-form-urlencoded'
+};
+
+function setContentTypeIfUnset(headers, value) {
+ if (!utils.isUndefined(headers) && utils.isUndefined(headers['Content-Type'])) {
+ headers['Content-Type'] = value;
+ }
+}
+
+function getDefaultAdapter() {
+ var adapter;
+ if (typeof XMLHttpRequest !== 'undefined') {
+ // For browsers use XHR adapter
+ adapter = require('./adapters/xhr');
+ } else if (typeof process !== 'undefined' && Object.prototype.toString.call(process) === '[object process]') {
+ // For node use HTTP adapter
+ adapter = require('./adapters/http');
+ }
+ return adapter;
+}
+
+var defaults = {
+ adapter: getDefaultAdapter(),
+
+ transformRequest: [function transformRequest(data, headers) {
+ normalizeHeaderName(headers, 'Accept');
+ normalizeHeaderName(headers, 'Content-Type');
+ if (utils.isFormData(data) ||
+ utils.isArrayBuffer(data) ||
+ utils.isBuffer(data) ||
+ utils.isStream(data) ||
+ utils.isFile(data) ||
+ utils.isBlob(data)
+ ) {
+ return data;
+ }
+ if (utils.isArrayBufferView(data)) {
+ return data.buffer;
+ }
+ if (utils.isURLSearchParams(data)) {
+ setContentTypeIfUnset(headers, 'application/x-www-form-urlencoded;charset=utf-8');
+ return data.toString();
+ }
+ if (utils.isObject(data)) {
+ setContentTypeIfUnset(headers, 'application/json;charset=utf-8');
+ return JSON.stringify(data);
+ }
+ return data;
+ }],
+
+ transformResponse: [function transformResponse(data) {
+ /*eslint no-param-reassign:0*/
+ if (typeof data === 'string') {
+ try {
+ data = JSON.parse(data);
+ } catch (e) { /* Ignore */ }
+ }
+ return data;
+ }],
+
+ /**
+ * A timeout in milliseconds to abort a request. If set to 0 (default) a
+ * timeout is not created.
+ */
+ timeout: 0,
+
+ xsrfCookieName: 'XSRF-TOKEN',
+ xsrfHeaderName: 'X-XSRF-TOKEN',
+
+ maxContentLength: -1,
+ maxBodyLength: -1,
+
+ validateStatus: function validateStatus(status) {
+ return status >= 200 && status < 300;
+ }
+};
+
+defaults.headers = {
+ common: {
+ 'Accept': 'application/json, text/plain, */*'
+ }
+};
+
+utils.forEach(['delete', 'get', 'head'], function forEachMethodNoData(method) {
+ defaults.headers[method] = {};
+});
+
+utils.forEach(['post', 'put', 'patch'], function forEachMethodWithData(method) {
+ defaults.headers[method] = utils.merge(DEFAULT_CONTENT_TYPE);
+});
+
+module.exports = defaults;
+
+}).call(this)}).call(this,require('_process'))
+},{"./adapters/http":7,"./adapters/xhr":7,"./helpers/normalizeHeaderName":29,"./utils":32,"_process":76}],22:[function(require,module,exports){
+'use strict';
+
+module.exports = function bind(fn, thisArg) {
+ return function wrap() {
+ var args = new Array(arguments.length);
+ for (var i = 0; i < args.length; i++) {
+ args[i] = arguments[i];
+ }
+ return fn.apply(thisArg, args);
+ };
+};
+
+},{}],23:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+function encode(val) {
+ return encodeURIComponent(val).
+ replace(/%3A/gi, ':').
+ replace(/%24/g, '$').
+ replace(/%2C/gi, ',').
+ replace(/%20/g, '+').
+ replace(/%5B/gi, '[').
+ replace(/%5D/gi, ']');
+}
+
+/**
+ * Build a URL by appending params to the end
+ *
+ * @param {string} url The base of the url (e.g., http://www.google.com)
+ * @param {object} [params] The params to be appended
+ * @returns {string} The formatted url
+ */
+module.exports = function buildURL(url, params, paramsSerializer) {
+ /*eslint no-param-reassign:0*/
+ if (!params) {
+ return url;
+ }
+
+ var serializedParams;
+ if (paramsSerializer) {
+ serializedParams = paramsSerializer(params);
+ } else if (utils.isURLSearchParams(params)) {
+ serializedParams = params.toString();
+ } else {
+ var parts = [];
+
+ utils.forEach(params, function serialize(val, key) {
+ if (val === null || typeof val === 'undefined') {
+ return;
+ }
+
+ if (utils.isArray(val)) {
+ key = key + '[]';
+ } else {
+ val = [val];
+ }
+
+ utils.forEach(val, function parseValue(v) {
+ if (utils.isDate(v)) {
+ v = v.toISOString();
+ } else if (utils.isObject(v)) {
+ v = JSON.stringify(v);
+ }
+ parts.push(encode(key) + '=' + encode(v));
+ });
+ });
+
+ serializedParams = parts.join('&');
+ }
+
+ if (serializedParams) {
+ var hashmarkIndex = url.indexOf('#');
+ if (hashmarkIndex !== -1) {
+ url = url.slice(0, hashmarkIndex);
+ }
+
+ url += (url.indexOf('?') === -1 ? '?' : '&') + serializedParams;
+ }
+
+ return url;
+};
+
+},{"./../utils":32}],24:[function(require,module,exports){
+'use strict';
+
+/**
+ * Creates a new URL by combining the specified URLs
+ *
+ * @param {string} baseURL The base URL
+ * @param {string} relativeURL The relative URL
+ * @returns {string} The combined URL
+ */
+module.exports = function combineURLs(baseURL, relativeURL) {
+ return relativeURL
+ ? baseURL.replace(/\/+$/, '') + '/' + relativeURL.replace(/^\/+/, '')
+ : baseURL;
+};
+
+},{}],25:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+module.exports = (
+ utils.isStandardBrowserEnv() ?
+
+ // Standard browser envs support document.cookie
+ (function standardBrowserEnv() {
+ return {
+ write: function write(name, value, expires, path, domain, secure) {
+ var cookie = [];
+ cookie.push(name + '=' + encodeURIComponent(value));
+
+ if (utils.isNumber(expires)) {
+ cookie.push('expires=' + new Date(expires).toGMTString());
+ }
+
+ if (utils.isString(path)) {
+ cookie.push('path=' + path);
+ }
+
+ if (utils.isString(domain)) {
+ cookie.push('domain=' + domain);
+ }
+
+ if (secure === true) {
+ cookie.push('secure');
+ }
+
+ document.cookie = cookie.join('; ');
+ },
+
+ read: function read(name) {
+ var match = document.cookie.match(new RegExp('(^|;\\s*)(' + name + ')=([^;]*)'));
+ return (match ? decodeURIComponent(match[3]) : null);
+ },
+
+ remove: function remove(name) {
+ this.write(name, '', Date.now() - 86400000);
+ }
+ };
+ })() :
+
+ // Non standard browser env (web workers, react-native) lack needed support.
+ (function nonStandardBrowserEnv() {
+ return {
+ write: function write() {},
+ read: function read() { return null; },
+ remove: function remove() {}
+ };
+ })()
+);
+
+},{"./../utils":32}],26:[function(require,module,exports){
+'use strict';
+
+/**
+ * Determines whether the specified URL is absolute
+ *
+ * @param {string} url The URL to test
+ * @returns {boolean} True if the specified URL is absolute, otherwise false
+ */
+module.exports = function isAbsoluteURL(url) {
+ // A URL is considered absolute if it begins with "://" or "//" (protocol-relative URL).
+ // RFC 3986 defines scheme name as a sequence of characters beginning with a letter and followed
+ // by any combination of letters, digits, plus, period, or hyphen.
+ return /^([a-z][a-z\d\+\-\.]*:)?\/\//i.test(url);
+};
+
+},{}],27:[function(require,module,exports){
+'use strict';
+
+/**
+ * Determines whether the payload is an error thrown by Axios
+ *
+ * @param {*} payload The value to test
+ * @returns {boolean} True if the payload is an error thrown by Axios, otherwise false
+ */
+module.exports = function isAxiosError(payload) {
+ return (typeof payload === 'object') && (payload.isAxiosError === true);
+};
+
+},{}],28:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+module.exports = (
+ utils.isStandardBrowserEnv() ?
+
+ // Standard browser envs have full support of the APIs needed to test
+ // whether the request URL is of the same origin as current location.
+ (function standardBrowserEnv() {
+ var msie = /(msie|trident)/i.test(navigator.userAgent);
+ var urlParsingNode = document.createElement('a');
+ var originURL;
+
+ /**
+ * Parse a URL to discover it's components
+ *
+ * @param {String} url The URL to be parsed
+ * @returns {Object}
+ */
+ function resolveURL(url) {
+ var href = url;
+
+ if (msie) {
+ // IE needs attribute set twice to normalize properties
+ urlParsingNode.setAttribute('href', href);
+ href = urlParsingNode.href;
+ }
+
+ urlParsingNode.setAttribute('href', href);
+
+ // urlParsingNode provides the UrlUtils interface - http://url.spec.whatwg.org/#urlutils
+ return {
+ href: urlParsingNode.href,
+ protocol: urlParsingNode.protocol ? urlParsingNode.protocol.replace(/:$/, '') : '',
+ host: urlParsingNode.host,
+ search: urlParsingNode.search ? urlParsingNode.search.replace(/^\?/, '') : '',
+ hash: urlParsingNode.hash ? urlParsingNode.hash.replace(/^#/, '') : '',
+ hostname: urlParsingNode.hostname,
+ port: urlParsingNode.port,
+ pathname: (urlParsingNode.pathname.charAt(0) === '/') ?
+ urlParsingNode.pathname :
+ '/' + urlParsingNode.pathname
+ };
+ }
+
+ originURL = resolveURL(window.location.href);
+
+ /**
+ * Determine if a URL shares the same origin as the current location
+ *
+ * @param {String} requestURL The URL to test
+ * @returns {boolean} True if URL shares the same origin, otherwise false
+ */
+ return function isURLSameOrigin(requestURL) {
+ var parsed = (utils.isString(requestURL)) ? resolveURL(requestURL) : requestURL;
+ return (parsed.protocol === originURL.protocol &&
+ parsed.host === originURL.host);
+ };
+ })() :
+
+ // Non standard browser envs (web workers, react-native) lack needed support.
+ (function nonStandardBrowserEnv() {
+ return function isURLSameOrigin() {
+ return true;
+ };
+ })()
+);
+
+},{"./../utils":32}],29:[function(require,module,exports){
+'use strict';
+
+var utils = require('../utils');
+
+module.exports = function normalizeHeaderName(headers, normalizedName) {
+ utils.forEach(headers, function processHeader(value, name) {
+ if (name !== normalizedName && name.toUpperCase() === normalizedName.toUpperCase()) {
+ headers[normalizedName] = value;
+ delete headers[name];
+ }
+ });
+};
+
+},{"../utils":32}],30:[function(require,module,exports){
+'use strict';
+
+var utils = require('./../utils');
+
+// Headers whose duplicates are ignored by node
+// c.f. https://nodejs.org/api/http.html#http_message_headers
+var ignoreDuplicateOf = [
+ 'age', 'authorization', 'content-length', 'content-type', 'etag',
+ 'expires', 'from', 'host', 'if-modified-since', 'if-unmodified-since',
+ 'last-modified', 'location', 'max-forwards', 'proxy-authorization',
+ 'referer', 'retry-after', 'user-agent'
+];
+
+/**
+ * Parse headers into an object
+ *
+ * ```
+ * Date: Wed, 27 Aug 2014 08:58:49 GMT
+ * Content-Type: application/json
+ * Connection: keep-alive
+ * Transfer-Encoding: chunked
+ * ```
+ *
+ * @param {String} headers Headers needing to be parsed
+ * @returns {Object} Headers parsed into an object
+ */
+module.exports = function parseHeaders(headers) {
+ var parsed = {};
+ var key;
+ var val;
+ var i;
+
+ if (!headers) { return parsed; }
+
+ utils.forEach(headers.split('\n'), function parser(line) {
+ i = line.indexOf(':');
+ key = utils.trim(line.substr(0, i)).toLowerCase();
+ val = utils.trim(line.substr(i + 1));
+
+ if (key) {
+ if (parsed[key] && ignoreDuplicateOf.indexOf(key) >= 0) {
+ return;
+ }
+ if (key === 'set-cookie') {
+ parsed[key] = (parsed[key] ? parsed[key] : []).concat([val]);
+ } else {
+ parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;
+ }
+ }
+ });
+
+ return parsed;
+};
+
+},{"./../utils":32}],31:[function(require,module,exports){
+'use strict';
+
+/**
+ * Syntactic sugar for invoking a function and expanding an array for arguments.
+ *
+ * Common use case would be to use `Function.prototype.apply`.
+ *
+ * ```js
+ * function f(x, y, z) {}
+ * var args = [1, 2, 3];
+ * f.apply(null, args);
+ * ```
+ *
+ * With `spread` this example can be re-written.
+ *
+ * ```js
+ * spread(function(x, y, z) {})([1, 2, 3]);
+ * ```
+ *
+ * @param {Function} callback
+ * @returns {Function}
+ */
+module.exports = function spread(callback) {
+ return function wrap(arr) {
+ return callback.apply(null, arr);
+ };
+};
+
+},{}],32:[function(require,module,exports){
+'use strict';
+
+var bind = require('./helpers/bind');
+
+/*global toString:true*/
+
+// utils is a library of generic helper functions non-specific to axios
+
+var toString = Object.prototype.toString;
+
+/**
+ * Determine if a value is an Array
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is an Array, otherwise false
+ */
+function isArray(val) {
+ return toString.call(val) === '[object Array]';
+}
+
+/**
+ * Determine if a value is undefined
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if the value is undefined, otherwise false
+ */
+function isUndefined(val) {
+ return typeof val === 'undefined';
+}
+
+/**
+ * Determine if a value is a Buffer
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Buffer, otherwise false
+ */
+function isBuffer(val) {
+ return val !== null && !isUndefined(val) && val.constructor !== null && !isUndefined(val.constructor)
+ && typeof val.constructor.isBuffer === 'function' && val.constructor.isBuffer(val);
+}
+
+/**
+ * Determine if a value is an ArrayBuffer
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is an ArrayBuffer, otherwise false
+ */
+function isArrayBuffer(val) {
+ return toString.call(val) === '[object ArrayBuffer]';
+}
+
+/**
+ * Determine if a value is a FormData
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is an FormData, otherwise false
+ */
+function isFormData(val) {
+ return (typeof FormData !== 'undefined') && (val instanceof FormData);
+}
+
+/**
+ * Determine if a value is a view on an ArrayBuffer
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a view on an ArrayBuffer, otherwise false
+ */
+function isArrayBufferView(val) {
+ var result;
+ if ((typeof ArrayBuffer !== 'undefined') && (ArrayBuffer.isView)) {
+ result = ArrayBuffer.isView(val);
+ } else {
+ result = (val) && (val.buffer) && (val.buffer instanceof ArrayBuffer);
+ }
+ return result;
+}
+
+/**
+ * Determine if a value is a String
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a String, otherwise false
+ */
+function isString(val) {
+ return typeof val === 'string';
+}
+
+/**
+ * Determine if a value is a Number
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Number, otherwise false
+ */
+function isNumber(val) {
+ return typeof val === 'number';
+}
+
+/**
+ * Determine if a value is an Object
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is an Object, otherwise false
+ */
+function isObject(val) {
+ return val !== null && typeof val === 'object';
+}
+
+/**
+ * Determine if a value is a plain Object
+ *
+ * @param {Object} val The value to test
+ * @return {boolean} True if value is a plain Object, otherwise false
+ */
+function isPlainObject(val) {
+ if (toString.call(val) !== '[object Object]') {
+ return false;
+ }
+
+ var prototype = Object.getPrototypeOf(val);
+ return prototype === null || prototype === Object.prototype;
+}
+
+/**
+ * Determine if a value is a Date
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Date, otherwise false
+ */
+function isDate(val) {
+ return toString.call(val) === '[object Date]';
+}
+
+/**
+ * Determine if a value is a File
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a File, otherwise false
+ */
+function isFile(val) {
+ return toString.call(val) === '[object File]';
+}
+
+/**
+ * Determine if a value is a Blob
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Blob, otherwise false
+ */
+function isBlob(val) {
+ return toString.call(val) === '[object Blob]';
+}
+
+/**
+ * Determine if a value is a Function
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Function, otherwise false
+ */
+function isFunction(val) {
+ return toString.call(val) === '[object Function]';
+}
+
+/**
+ * Determine if a value is a Stream
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Stream, otherwise false
+ */
+function isStream(val) {
+ return isObject(val) && isFunction(val.pipe);
+}
+
+/**
+ * Determine if a value is a URLSearchParams object
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a URLSearchParams object, otherwise false
+ */
+function isURLSearchParams(val) {
+ return typeof URLSearchParams !== 'undefined' && val instanceof URLSearchParams;
+}
+
+/**
+ * Trim excess whitespace off the beginning and end of a string
+ *
+ * @param {String} str The String to trim
+ * @returns {String} The String freed of excess whitespace
+ */
+function trim(str) {
+ return str.replace(/^\s*/, '').replace(/\s*$/, '');
+}
+
+/**
+ * Determine if we're running in a standard browser environment
+ *
+ * This allows axios to run in a web worker, and react-native.
+ * Both environments support XMLHttpRequest, but not fully standard globals.
+ *
+ * web workers:
+ * typeof window -> undefined
+ * typeof document -> undefined
+ *
+ * react-native:
+ * navigator.product -> 'ReactNative'
+ * nativescript
+ * navigator.product -> 'NativeScript' or 'NS'
+ */
+function isStandardBrowserEnv() {
+ if (typeof navigator !== 'undefined' && (navigator.product === 'ReactNative' ||
+ navigator.product === 'NativeScript' ||
+ navigator.product === 'NS')) {
+ return false;
+ }
+ return (
+ typeof window !== 'undefined' &&
+ typeof document !== 'undefined'
+ );
+}
+
+/**
+ * Iterate over an Array or an Object invoking a function for each item.
+ *
+ * If `obj` is an Array callback will be called passing
+ * the value, index, and complete array for each item.
+ *
+ * If 'obj' is an Object callback will be called passing
+ * the value, key, and complete object for each property.
+ *
+ * @param {Object|Array} obj The object to iterate
+ * @param {Function} fn The callback to invoke for each item
+ */
+function forEach(obj, fn) {
+ // Don't bother if no value provided
+ if (obj === null || typeof obj === 'undefined') {
+ return;
+ }
+
+ // Force an array if not already something iterable
+ if (typeof obj !== 'object') {
+ /*eslint no-param-reassign:0*/
+ obj = [obj];
+ }
+
+ if (isArray(obj)) {
+ // Iterate over array values
+ for (var i = 0, l = obj.length; i < l; i++) {
+ fn.call(null, obj[i], i, obj);
+ }
+ } else {
+ // Iterate over object keys
+ for (var key in obj) {
+ if (Object.prototype.hasOwnProperty.call(obj, key)) {
+ fn.call(null, obj[key], key, obj);
+ }
+ }
+ }
+}
+
+/**
+ * Accepts varargs expecting each argument to be an object, then
+ * immutably merges the properties of each object and returns result.
+ *
+ * When multiple objects contain the same key the later object in
+ * the arguments list will take precedence.
+ *
+ * Example:
+ *
+ * ```js
+ * var result = merge({foo: 123}, {foo: 456});
+ * console.log(result.foo); // outputs 456
+ * ```
+ *
+ * @param {Object} obj1 Object to merge
+ * @returns {Object} Result of all merge properties
+ */
+function merge(/* obj1, obj2, obj3, ... */) {
+ var result = {};
+ function assignValue(val, key) {
+ if (isPlainObject(result[key]) && isPlainObject(val)) {
+ result[key] = merge(result[key], val);
+ } else if (isPlainObject(val)) {
+ result[key] = merge({}, val);
+ } else if (isArray(val)) {
+ result[key] = val.slice();
+ } else {
+ result[key] = val;
+ }
+ }
+
+ for (var i = 0, l = arguments.length; i < l; i++) {
+ forEach(arguments[i], assignValue);
+ }
+ return result;
+}
+
+/**
+ * Extends object a by mutably adding to it the properties of object b.
+ *
+ * @param {Object} a The object to be extended
+ * @param {Object} b The object to copy properties from
+ * @param {Object} thisArg The object to bind function to
+ * @return {Object} The resulting value of object a
+ */
+function extend(a, b, thisArg) {
+ forEach(b, function assignValue(val, key) {
+ if (thisArg && typeof val === 'function') {
+ a[key] = bind(val, thisArg);
+ } else {
+ a[key] = val;
+ }
+ });
+ return a;
+}
+
+/**
+ * Remove byte order marker. This catches EF BB BF (the UTF-8 BOM)
+ *
+ * @param {string} content with BOM
+ * @return {string} content value without BOM
+ */
+function stripBOM(content) {
+ if (content.charCodeAt(0) === 0xFEFF) {
+ content = content.slice(1);
+ }
+ return content;
+}
+
+module.exports = {
+ isArray: isArray,
+ isArrayBuffer: isArrayBuffer,
+ isBuffer: isBuffer,
+ isFormData: isFormData,
+ isArrayBufferView: isArrayBufferView,
+ isString: isString,
+ isNumber: isNumber,
+ isObject: isObject,
+ isPlainObject: isPlainObject,
+ isUndefined: isUndefined,
+ isDate: isDate,
+ isFile: isFile,
+ isBlob: isBlob,
+ isFunction: isFunction,
+ isStream: isStream,
+ isURLSearchParams: isURLSearchParams,
+ isStandardBrowserEnv: isStandardBrowserEnv,
+ forEach: forEach,
+ merge: merge,
+ extend: extend,
+ trim: trim,
+ stripBOM: stripBOM
+};
+
+},{"./helpers/bind":22}],33:[function(require,module,exports){
+module.exports = require('./lib/chai');
+
+},{"./lib/chai":34}],34:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var used = [];
+
+/*!
+ * Chai version
+ */
+
+exports.version = '4.2.0';
+
+/*!
+ * Assertion Error
+ */
+
+exports.AssertionError = require('assertion-error');
+
+/*!
+ * Utils for plugins (not exported)
+ */
+
+var util = require('./chai/utils');
+
+/**
+ * # .use(function)
+ *
+ * Provides a way to extend the internals of Chai.
+ *
+ * @param {Function}
+ * @returns {this} for chaining
+ * @api public
+ */
+
+exports.use = function (fn) {
+ if (!~used.indexOf(fn)) {
+ fn(exports, util);
+ used.push(fn);
+ }
+
+ return exports;
+};
+
+/*!
+ * Utility Functions
+ */
+
+exports.util = util;
+
+/*!
+ * Configuration
+ */
+
+var config = require('./chai/config');
+exports.config = config;
+
+/*!
+ * Primary `Assertion` prototype
+ */
+
+var assertion = require('./chai/assertion');
+exports.use(assertion);
+
+/*!
+ * Core Assertions
+ */
+
+var core = require('./chai/core/assertions');
+exports.use(core);
+
+/*!
+ * Expect interface
+ */
+
+var expect = require('./chai/interface/expect');
+exports.use(expect);
+
+/*!
+ * Should interface
+ */
+
+var should = require('./chai/interface/should');
+exports.use(should);
+
+/*!
+ * Assert interface
+ */
+
+var assert = require('./chai/interface/assert');
+exports.use(assert);
+
+},{"./chai/assertion":35,"./chai/config":36,"./chai/core/assertions":37,"./chai/interface/assert":38,"./chai/interface/expect":39,"./chai/interface/should":40,"./chai/utils":54,"assertion-error":5}],35:[function(require,module,exports){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var config = require('./config');
+
+module.exports = function (_chai, util) {
+ /*!
+ * Module dependencies.
+ */
+
+ var AssertionError = _chai.AssertionError
+ , flag = util.flag;
+
+ /*!
+ * Module export.
+ */
+
+ _chai.Assertion = Assertion;
+
+ /*!
+ * Assertion Constructor
+ *
+ * Creates object for chaining.
+ *
+ * `Assertion` objects contain metadata in the form of flags. Three flags can
+ * be assigned during instantiation by passing arguments to this constructor:
+ *
+ * - `object`: This flag contains the target of the assertion. For example, in
+ * the assertion `expect(numKittens).to.equal(7);`, the `object` flag will
+ * contain `numKittens` so that the `equal` assertion can reference it when
+ * needed.
+ *
+ * - `message`: This flag contains an optional custom error message to be
+ * prepended to the error message that's generated by the assertion when it
+ * fails.
+ *
+ * - `ssfi`: This flag stands for "start stack function indicator". It
+ * contains a function reference that serves as the starting point for
+ * removing frames from the stack trace of the error that's created by the
+ * assertion when it fails. The goal is to provide a cleaner stack trace to
+ * end users by removing Chai's internal functions. Note that it only works
+ * in environments that support `Error.captureStackTrace`, and only when
+ * `Chai.config.includeStack` hasn't been set to `false`.
+ *
+ * - `lockSsfi`: This flag controls whether or not the given `ssfi` flag
+ * should retain its current value, even as assertions are chained off of
+ * this object. This is usually set to `true` when creating a new assertion
+ * from within another assertion. It's also temporarily set to `true` before
+ * an overwritten assertion gets called by the overwriting assertion.
+ *
+ * @param {Mixed} obj target of the assertion
+ * @param {String} msg (optional) custom error message
+ * @param {Function} ssfi (optional) starting point for removing stack frames
+ * @param {Boolean} lockSsfi (optional) whether or not the ssfi flag is locked
+ * @api private
+ */
+
+ function Assertion (obj, msg, ssfi, lockSsfi) {
+ flag(this, 'ssfi', ssfi || Assertion);
+ flag(this, 'lockSsfi', lockSsfi);
+ flag(this, 'object', obj);
+ flag(this, 'message', msg);
+
+ return util.proxify(this);
+ }
+
+ Object.defineProperty(Assertion, 'includeStack', {
+ get: function() {
+ console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
+ return config.includeStack;
+ },
+ set: function(value) {
+ console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
+ config.includeStack = value;
+ }
+ });
+
+ Object.defineProperty(Assertion, 'showDiff', {
+ get: function() {
+ console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
+ return config.showDiff;
+ },
+ set: function(value) {
+ console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
+ config.showDiff = value;
+ }
+ });
+
+ Assertion.addProperty = function (name, fn) {
+ util.addProperty(this.prototype, name, fn);
+ };
+
+ Assertion.addMethod = function (name, fn) {
+ util.addMethod(this.prototype, name, fn);
+ };
+
+ Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
+ util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
+ };
+
+ Assertion.overwriteProperty = function (name, fn) {
+ util.overwriteProperty(this.prototype, name, fn);
+ };
+
+ Assertion.overwriteMethod = function (name, fn) {
+ util.overwriteMethod(this.prototype, name, fn);
+ };
+
+ Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {
+ util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);
+ };
+
+ /**
+ * ### .assert(expression, message, negateMessage, expected, actual, showDiff)
+ *
+ * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
+ *
+ * @name assert
+ * @param {Philosophical} expression to be tested
+ * @param {String|Function} message or function that returns message to display if expression fails
+ * @param {String|Function} negatedMessage or function that returns negatedMessage to display if negated expression fails
+ * @param {Mixed} expected value (remember to check for negation)
+ * @param {Mixed} actual (optional) will default to `this.obj`
+ * @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails
+ * @api private
+ */
+
+ Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
+ var ok = util.test(this, arguments);
+ if (false !== showDiff) showDiff = true;
+ if (undefined === expected && undefined === _actual) showDiff = false;
+ if (true !== config.showDiff) showDiff = false;
+
+ if (!ok) {
+ msg = util.getMessage(this, arguments);
+ var actual = util.getActual(this, arguments);
+ throw new AssertionError(msg, {
+ actual: actual
+ , expected: expected
+ , showDiff: showDiff
+ }, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
+ }
+ };
+
+ /*!
+ * ### ._obj
+ *
+ * Quick reference to stored `actual` value for plugin developers.
+ *
+ * @api private
+ */
+
+ Object.defineProperty(Assertion.prototype, '_obj',
+ { get: function () {
+ return flag(this, 'object');
+ }
+ , set: function (val) {
+ flag(this, 'object', val);
+ }
+ });
+};
+
+},{"./config":36}],36:[function(require,module,exports){
+module.exports = {
+
+ /**
+ * ### config.includeStack
+ *
+ * User configurable property, influences whether stack trace
+ * is included in Assertion error message. Default of false
+ * suppresses stack trace in the error message.
+ *
+ * chai.config.includeStack = true; // enable stack on error
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ includeStack: false,
+
+ /**
+ * ### config.showDiff
+ *
+ * User configurable property, influences whether or not
+ * the `showDiff` flag should be included in the thrown
+ * AssertionErrors. `false` will always be `false`; `true`
+ * will be true when the assertion has requested a diff
+ * be shown.
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ showDiff: true,
+
+ /**
+ * ### config.truncateThreshold
+ *
+ * User configurable property, sets length threshold for actual and
+ * expected values in assertion errors. If this threshold is exceeded, for
+ * example for large data structures, the value is replaced with something
+ * like `[ Array(3) ]` or `{ Object (prop1, prop2) }`.
+ *
+ * Set it to zero if you want to disable truncating altogether.
+ *
+ * This is especially userful when doing assertions on arrays: having this
+ * set to a reasonable large value makes the failure messages readily
+ * inspectable.
+ *
+ * chai.config.truncateThreshold = 0; // disable truncating
+ *
+ * @param {Number}
+ * @api public
+ */
+
+ truncateThreshold: 40,
+
+ /**
+ * ### config.useProxy
+ *
+ * User configurable property, defines if chai will use a Proxy to throw
+ * an error when a non-existent property is read, which protects users
+ * from typos when using property-based assertions.
+ *
+ * Set it to false if you want to disable this feature.
+ *
+ * chai.config.useProxy = false; // disable use of Proxy
+ *
+ * This feature is automatically disabled regardless of this config value
+ * in environments that don't support proxies.
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ useProxy: true,
+
+ /**
+ * ### config.proxyExcludedKeys
+ *
+ * User configurable property, defines which properties should be ignored
+ * instead of throwing an error if they do not exist on the assertion.
+ * This is only applied if the environment Chai is running in supports proxies and
+ * if the `useProxy` configuration setting is enabled.
+ * By default, `then` and `inspect` will not throw an error if they do not exist on the
+ * assertion object because the `.inspect` property is read by `util.inspect` (for example, when
+ * using `console.log` on the assertion object) and `.then` is necessary for promise type-checking.
+ *
+ * // By default these keys will not throw an error if they do not exist on the assertion object
+ * chai.config.proxyExcludedKeys = ['then', 'inspect'];
+ *
+ * @param {Array}
+ * @api public
+ */
+
+ proxyExcludedKeys: ['then', 'catch', 'inspect', 'toJSON']
+};
+
+},{}],37:[function(require,module,exports){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+module.exports = function (chai, _) {
+ var Assertion = chai.Assertion
+ , AssertionError = chai.AssertionError
+ , flag = _.flag;
+
+ /**
+ * ### Language Chains
+ *
+ * The following are provided as chainable getters to improve the readability
+ * of your assertions.
+ *
+ * **Chains**
+ *
+ * - to
+ * - be
+ * - been
+ * - is
+ * - that
+ * - which
+ * - and
+ * - has
+ * - have
+ * - with
+ * - at
+ * - of
+ * - same
+ * - but
+ * - does
+ * - still
+ *
+ * @name language chains
+ * @namespace BDD
+ * @api public
+ */
+
+ [ 'to', 'be', 'been', 'is'
+ , 'and', 'has', 'have', 'with'
+ , 'that', 'which', 'at', 'of'
+ , 'same', 'but', 'does', 'still' ].forEach(function (chain) {
+ Assertion.addProperty(chain);
+ });
+
+ /**
+ * ### .not
+ *
+ * Negates all assertions that follow in the chain.
+ *
+ * expect(function () {}).to.not.throw();
+ * expect({a: 1}).to.not.have.property('b');
+ * expect([1, 2]).to.be.an('array').that.does.not.include(3);
+ *
+ * Just because you can negate any assertion with `.not` doesn't mean you
+ * should. With great power comes great responsibility. It's often best to
+ * assert that the one expected output was produced, rather than asserting
+ * that one of countless unexpected outputs wasn't produced. See individual
+ * assertions for specific guidance.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.equal(1); // Not recommended
+ *
+ * @name not
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('not', function () {
+ flag(this, 'negate', true);
+ });
+
+ /**
+ * ### .deep
+ *
+ * Causes all `.equal`, `.include`, `.members`, `.keys`, and `.property`
+ * assertions that follow in the chain to use deep equality instead of strict
+ * (`===`) equality. See the `deep-eql` project page for info on the deep
+ * equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) equals `{a: 1}`
+ * expect({a: 1}).to.deep.equal({a: 1});
+ * expect({a: 1}).to.not.equal({a: 1});
+ *
+ * // Target array deeply (but not strictly) includes `{a: 1}`
+ * expect([{a: 1}]).to.deep.include({a: 1});
+ * expect([{a: 1}]).to.not.include({a: 1});
+ *
+ * // Target object deeply (but not strictly) includes `x: {a: 1}`
+ * expect({x: {a: 1}}).to.deep.include({x: {a: 1}});
+ * expect({x: {a: 1}}).to.not.include({x: {a: 1}});
+ *
+ * // Target array deeply (but not strictly) has member `{a: 1}`
+ * expect([{a: 1}]).to.have.deep.members([{a: 1}]);
+ * expect([{a: 1}]).to.not.have.members([{a: 1}]);
+ *
+ * // Target set deeply (but not strictly) has key `{a: 1}`
+ * expect(new Set([{a: 1}])).to.have.deep.keys([{a: 1}]);
+ * expect(new Set([{a: 1}])).to.not.have.keys([{a: 1}]);
+ *
+ * // Target object deeply (but not strictly) has property `x: {a: 1}`
+ * expect({x: {a: 1}}).to.have.deep.property('x', {a: 1});
+ * expect({x: {a: 1}}).to.not.have.property('x', {a: 1});
+ *
+ * @name deep
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('deep', function () {
+ flag(this, 'deep', true);
+ });
+
+ /**
+ * ### .nested
+ *
+ * Enables dot- and bracket-notation in all `.property` and `.include`
+ * assertions that follow in the chain.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]');
+ * expect({a: {b: ['x', 'y']}}).to.nested.include({'a.b[1]': 'y'});
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 'x'}}).to.have.nested.property('\\.a.\\[b\\]');
+ * expect({'.a': {'[b]': 'x'}}).to.nested.include({'\\.a.\\[b\\]': 'x'});
+ *
+ * `.nested` cannot be combined with `.own`.
+ *
+ * @name nested
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('nested', function () {
+ flag(this, 'nested', true);
+ });
+
+ /**
+ * ### .own
+ *
+ * Causes all `.property` and `.include` assertions that follow in the chain
+ * to ignore inherited properties.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.have.own.property('a');
+ * expect({a: 1}).to.have.property('b');
+ * expect({a: 1}).to.not.have.own.property('b');
+ *
+ * expect({a: 1}).to.own.include({a: 1});
+ * expect({a: 1}).to.include({b: 2}).but.not.own.include({b: 2});
+ *
+ * `.own` cannot be combined with `.nested`.
+ *
+ * @name own
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('own', function () {
+ flag(this, 'own', true);
+ });
+
+ /**
+ * ### .ordered
+ *
+ * Causes all `.members` assertions that follow in the chain to require that
+ * members be in the same order.
+ *
+ * expect([1, 2]).to.have.ordered.members([1, 2])
+ * .but.not.have.ordered.members([2, 1]);
+ *
+ * When `.include` and `.ordered` are combined, the ordering begins at the
+ * start of both arrays.
+ *
+ * expect([1, 2, 3]).to.include.ordered.members([1, 2])
+ * .but.not.include.ordered.members([2, 3]);
+ *
+ * @name ordered
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('ordered', function () {
+ flag(this, 'ordered', true);
+ });
+
+ /**
+ * ### .any
+ *
+ * Causes all `.keys` assertions that follow in the chain to only require that
+ * the target have at least one of the given keys. This is the opposite of
+ * `.all`, which requires that the target have all of the given keys.
+ *
+ * expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
+ *
+ * See the `.keys` doc for guidance on when to use `.any` or `.all`.
+ *
+ * @name any
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('any', function () {
+ flag(this, 'any', true);
+ flag(this, 'all', false);
+ });
+
+ /**
+ * ### .all
+ *
+ * Causes all `.keys` assertions that follow in the chain to require that the
+ * target have all of the given keys. This is the opposite of `.any`, which
+ * only requires that the target have at least one of the given keys.
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ *
+ * Note that `.all` is used by default when neither `.all` nor `.any` are
+ * added earlier in the chain. However, it's often best to add `.all` anyway
+ * because it improves readability.
+ *
+ * See the `.keys` doc for guidance on when to use `.any` or `.all`.
+ *
+ * @name all
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('all', function () {
+ flag(this, 'all', true);
+ flag(this, 'any', false);
+ });
+
+ /**
+ * ### .a(type[, msg])
+ *
+ * Asserts that the target's type is equal to the given string `type`. Types
+ * are case insensitive. See the `type-detect` project page for info on the
+ * type detection algorithm: https://github.com/chaijs/type-detect.
+ *
+ * expect('foo').to.be.a('string');
+ * expect({a: 1}).to.be.an('object');
+ * expect(null).to.be.a('null');
+ * expect(undefined).to.be.an('undefined');
+ * expect(new Error).to.be.an('error');
+ * expect(Promise.resolve()).to.be.a('promise');
+ * expect(new Float32Array).to.be.a('float32array');
+ * expect(Symbol()).to.be.a('symbol');
+ *
+ * `.a` supports objects that have a custom type set via `Symbol.toStringTag`.
+ *
+ * var myObj = {
+ * [Symbol.toStringTag]: 'myCustomType'
+ * };
+ *
+ * expect(myObj).to.be.a('myCustomType').but.not.an('object');
+ *
+ * It's often best to use `.a` to check a target's type before making more
+ * assertions on the same target. That way, you avoid unexpected behavior from
+ * any assertion that does different things based on the target's type.
+ *
+ * expect([1, 2, 3]).to.be.an('array').that.includes(2);
+ * expect([]).to.be.an('array').that.is.empty;
+ *
+ * Add `.not` earlier in the chain to negate `.a`. However, it's often best to
+ * assert that the target is the expected type, rather than asserting that it
+ * isn't one of many unexpected types.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.an('array'); // Not recommended
+ *
+ * `.a` accepts an optional `msg` argument which is a custom error message to
+ * show when the assertion fails. The message can also be given as the second
+ * argument to `expect`.
+ *
+ * expect(1).to.be.a('string', 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.a('string');
+ *
+ * `.a` can also be used as a language chain to improve the readability of
+ * your assertions.
+ *
+ * expect({b: 2}).to.have.a.property('b');
+ *
+ * The alias `.an` can be used interchangeably with `.a`.
+ *
+ * @name a
+ * @alias an
+ * @param {String} type
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function an (type, msg) {
+ if (msg) flag(this, 'message', msg);
+ type = type.toLowerCase();
+ var obj = flag(this, 'object')
+ , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';
+
+ this.assert(
+ type === _.type(obj).toLowerCase()
+ , 'expected #{this} to be ' + article + type
+ , 'expected #{this} not to be ' + article + type
+ );
+ }
+
+ Assertion.addChainableMethod('an', an);
+ Assertion.addChainableMethod('a', an);
+
+ /**
+ * ### .include(val[, msg])
+ *
+ * When the target is a string, `.include` asserts that the given string `val`
+ * is a substring of the target.
+ *
+ * expect('foobar').to.include('foo');
+ *
+ * When the target is an array, `.include` asserts that the given `val` is a
+ * member of the target.
+ *
+ * expect([1, 2, 3]).to.include(2);
+ *
+ * When the target is an object, `.include` asserts that the given object
+ * `val`'s properties are a subset of the target's properties.
+ *
+ * expect({a: 1, b: 2, c: 3}).to.include({a: 1, b: 2});
+ *
+ * When the target is a Set or WeakSet, `.include` asserts that the given `val` is a
+ * member of the target. SameValueZero equality algorithm is used.
+ *
+ * expect(new Set([1, 2])).to.include(2);
+ *
+ * When the target is a Map, `.include` asserts that the given `val` is one of
+ * the values of the target. SameValueZero equality algorithm is used.
+ *
+ * expect(new Map([['a', 1], ['b', 2]])).to.include(2);
+ *
+ * Because `.include` does different things based on the target's type, it's
+ * important to check the target's type before using `.include`. See the `.a`
+ * doc for info on testing a target's type.
+ *
+ * expect([1, 2, 3]).to.be.an('array').that.includes(2);
+ *
+ * By default, strict (`===`) equality is used to compare array members and
+ * object properties. Add `.deep` earlier in the chain to use deep equality
+ * instead (WeakSet targets are not supported). See the `deep-eql` project
+ * page for info on the deep equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target array deeply (but not strictly) includes `{a: 1}`
+ * expect([{a: 1}]).to.deep.include({a: 1});
+ * expect([{a: 1}]).to.not.include({a: 1});
+ *
+ * // Target object deeply (but not strictly) includes `x: {a: 1}`
+ * expect({x: {a: 1}}).to.deep.include({x: {a: 1}});
+ * expect({x: {a: 1}}).to.not.include({x: {a: 1}});
+ *
+ * By default, all of the target's properties are searched when working with
+ * objects. This includes properties that are inherited and/or non-enumerable.
+ * Add `.own` earlier in the chain to exclude the target's inherited
+ * properties from the search.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.own.include({a: 1});
+ * expect({a: 1}).to.include({b: 2}).but.not.own.include({b: 2});
+ *
+ * Note that a target object is always only searched for `val`'s own
+ * enumerable properties.
+ *
+ * `.deep` and `.own` can be combined.
+ *
+ * expect({a: {b: 2}}).to.deep.own.include({a: {b: 2}});
+ *
+ * Add `.nested` earlier in the chain to enable dot- and bracket-notation when
+ * referencing nested properties.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.nested.include({'a.b[1]': 'y'});
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 2}}).to.nested.include({'\\.a.\\[b\\]': 2});
+ *
+ * `.deep` and `.nested` can be combined.
+ *
+ * expect({a: {b: [{c: 3}]}}).to.deep.nested.include({'a.b[0]': {c: 3}});
+ *
+ * `.own` and `.nested` cannot be combined.
+ *
+ * Add `.not` earlier in the chain to negate `.include`.
+ *
+ * expect('foobar').to.not.include('taco');
+ * expect([1, 2, 3]).to.not.include(4);
+ *
+ * However, it's dangerous to negate `.include` when the target is an object.
+ * The problem is that it creates uncertain expectations by asserting that the
+ * target object doesn't have all of `val`'s key/value pairs but may or may
+ * not have some of them. It's often best to identify the exact output that's
+ * expected, and then write an assertion that only accepts that exact output.
+ *
+ * When the target object isn't even expected to have `val`'s keys, it's
+ * often best to assert exactly that.
+ *
+ * expect({c: 3}).to.not.have.any.keys('a', 'b'); // Recommended
+ * expect({c: 3}).to.not.include({a: 1, b: 2}); // Not recommended
+ *
+ * When the target object is expected to have `val`'s keys, it's often best to
+ * assert that each of the properties has its expected value, rather than
+ * asserting that each property doesn't have one of many unexpected values.
+ *
+ * expect({a: 3, b: 4}).to.include({a: 3, b: 4}); // Recommended
+ * expect({a: 3, b: 4}).to.not.include({a: 1, b: 2}); // Not recommended
+ *
+ * `.include` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2, 3]).to.include(4, 'nooo why fail??');
+ * expect([1, 2, 3], 'nooo why fail??').to.include(4);
+ *
+ * `.include` can also be used as a language chain, causing all `.members` and
+ * `.keys` assertions that follow in the chain to require the target to be a
+ * superset of the expected set, rather than an identical set. Note that
+ * `.members` ignores duplicates in the subset when `.include` is added.
+ *
+ * // Target object's keys are a superset of ['a', 'b'] but not identical
+ * expect({a: 1, b: 2, c: 3}).to.include.all.keys('a', 'b');
+ * expect({a: 1, b: 2, c: 3}).to.not.have.all.keys('a', 'b');
+ *
+ * // Target array is a superset of [1, 2] but not identical
+ * expect([1, 2, 3]).to.include.members([1, 2]);
+ * expect([1, 2, 3]).to.not.have.members([1, 2]);
+ *
+ * // Duplicates in the subset are ignored
+ * expect([1, 2, 3]).to.include.members([1, 2, 2, 2]);
+ *
+ * Note that adding `.any` earlier in the chain causes the `.keys` assertion
+ * to ignore `.include`.
+ *
+ * // Both assertions are identical
+ * expect({a: 1}).to.include.any.keys('a', 'b');
+ * expect({a: 1}).to.have.any.keys('a', 'b');
+ *
+ * The aliases `.includes`, `.contain`, and `.contains` can be used
+ * interchangeably with `.include`.
+ *
+ * @name include
+ * @alias contain
+ * @alias includes
+ * @alias contains
+ * @param {Mixed} val
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function SameValueZero(a, b) {
+ return (_.isNaN(a) && _.isNaN(b)) || a === b;
+ }
+
+ function includeChainingBehavior () {
+ flag(this, 'contains', true);
+ }
+
+ function include (val, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var obj = flag(this, 'object')
+ , objType = _.type(obj).toLowerCase()
+ , flagMsg = flag(this, 'message')
+ , negate = flag(this, 'negate')
+ , ssfi = flag(this, 'ssfi')
+ , isDeep = flag(this, 'deep')
+ , descriptor = isDeep ? 'deep ' : '';
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ var included = false;
+
+ switch (objType) {
+ case 'string':
+ included = obj.indexOf(val) !== -1;
+ break;
+
+ case 'weakset':
+ if (isDeep) {
+ throw new AssertionError(
+ flagMsg + 'unable to use .deep.include with WeakSet',
+ undefined,
+ ssfi
+ );
+ }
+
+ included = obj.has(val);
+ break;
+
+ case 'map':
+ var isEql = isDeep ? _.eql : SameValueZero;
+ obj.forEach(function (item) {
+ included = included || isEql(item, val);
+ });
+ break;
+
+ case 'set':
+ if (isDeep) {
+ obj.forEach(function (item) {
+ included = included || _.eql(item, val);
+ });
+ } else {
+ included = obj.has(val);
+ }
+ break;
+
+ case 'array':
+ if (isDeep) {
+ included = obj.some(function (item) {
+ return _.eql(item, val);
+ })
+ } else {
+ included = obj.indexOf(val) !== -1;
+ }
+ break;
+
+ default:
+ // This block is for asserting a subset of properties in an object.
+ // `_.expectTypes` isn't used here because `.include` should work with
+ // objects with a custom `@@toStringTag`.
+ if (val !== Object(val)) {
+ throw new AssertionError(
+ flagMsg + 'object tested must be an array, a map, an object,'
+ + ' a set, a string, or a weakset, but ' + objType + ' given',
+ undefined,
+ ssfi
+ );
+ }
+
+ var props = Object.keys(val)
+ , firstErr = null
+ , numErrs = 0;
+
+ props.forEach(function (prop) {
+ var propAssertion = new Assertion(obj);
+ _.transferFlags(this, propAssertion, true);
+ flag(propAssertion, 'lockSsfi', true);
+
+ if (!negate || props.length === 1) {
+ propAssertion.property(prop, val[prop]);
+ return;
+ }
+
+ try {
+ propAssertion.property(prop, val[prop]);
+ } catch (err) {
+ if (!_.checkError.compatibleConstructor(err, AssertionError)) {
+ throw err;
+ }
+ if (firstErr === null) firstErr = err;
+ numErrs++;
+ }
+ }, this);
+
+ // When validating .not.include with multiple properties, we only want
+ // to throw an assertion error if all of the properties are included,
+ // in which case we throw the first property assertion error that we
+ // encountered.
+ if (negate && props.length > 1 && numErrs === props.length) {
+ throw firstErr;
+ }
+ return;
+ }
+
+ // Assert inclusion in collection or substring in a string.
+ this.assert(
+ included
+ , 'expected #{this} to ' + descriptor + 'include ' + _.inspect(val)
+ , 'expected #{this} to not ' + descriptor + 'include ' + _.inspect(val));
+ }
+
+ Assertion.addChainableMethod('include', include, includeChainingBehavior);
+ Assertion.addChainableMethod('contain', include, includeChainingBehavior);
+ Assertion.addChainableMethod('contains', include, includeChainingBehavior);
+ Assertion.addChainableMethod('includes', include, includeChainingBehavior);
+
+ /**
+ * ### .ok
+ *
+ * Asserts that the target is a truthy value (considered `true` in boolean context).
+ * However, it's often best to assert that the target is strictly (`===`) or
+ * deeply equal to its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.ok; // Not recommended
+ *
+ * expect(true).to.be.true; // Recommended
+ * expect(true).to.be.ok; // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.ok`.
+ *
+ * expect(0).to.equal(0); // Recommended
+ * expect(0).to.not.be.ok; // Not recommended
+ *
+ * expect(false).to.be.false; // Recommended
+ * expect(false).to.not.be.ok; // Not recommended
+ *
+ * expect(null).to.be.null; // Recommended
+ * expect(null).to.not.be.ok; // Not recommended
+ *
+ * expect(undefined).to.be.undefined; // Recommended
+ * expect(undefined).to.not.be.ok; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(false, 'nooo why fail??').to.be.ok;
+ *
+ * @name ok
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('ok', function () {
+ this.assert(
+ flag(this, 'object')
+ , 'expected #{this} to be truthy'
+ , 'expected #{this} to be falsy');
+ });
+
+ /**
+ * ### .true
+ *
+ * Asserts that the target is strictly (`===`) equal to `true`.
+ *
+ * expect(true).to.be.true;
+ *
+ * Add `.not` earlier in the chain to negate `.true`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `true`.
+ *
+ * expect(false).to.be.false; // Recommended
+ * expect(false).to.not.be.true; // Not recommended
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.true; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(false, 'nooo why fail??').to.be.true;
+ *
+ * @name true
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('true', function () {
+ this.assert(
+ true === flag(this, 'object')
+ , 'expected #{this} to be true'
+ , 'expected #{this} to be false'
+ , flag(this, 'negate') ? false : true
+ );
+ });
+
+ /**
+ * ### .false
+ *
+ * Asserts that the target is strictly (`===`) equal to `false`.
+ *
+ * expect(false).to.be.false;
+ *
+ * Add `.not` earlier in the chain to negate `.false`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to `false`.
+ *
+ * expect(true).to.be.true; // Recommended
+ * expect(true).to.not.be.false; // Not recommended
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.false; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(true, 'nooo why fail??').to.be.false;
+ *
+ * @name false
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('false', function () {
+ this.assert(
+ false === flag(this, 'object')
+ , 'expected #{this} to be false'
+ , 'expected #{this} to be true'
+ , flag(this, 'negate') ? true : false
+ );
+ });
+
+ /**
+ * ### .null
+ *
+ * Asserts that the target is strictly (`===`) equal to `null`.
+ *
+ * expect(null).to.be.null;
+ *
+ * Add `.not` earlier in the chain to negate `.null`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `null`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.null; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.null;
+ *
+ * @name null
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('null', function () {
+ this.assert(
+ null === flag(this, 'object')
+ , 'expected #{this} to be null'
+ , 'expected #{this} not to be null'
+ );
+ });
+
+ /**
+ * ### .undefined
+ *
+ * Asserts that the target is strictly (`===`) equal to `undefined`.
+ *
+ * expect(undefined).to.be.undefined;
+ *
+ * Add `.not` earlier in the chain to negate `.undefined`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to `undefined`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.undefined; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.undefined;
+ *
+ * @name undefined
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('undefined', function () {
+ this.assert(
+ undefined === flag(this, 'object')
+ , 'expected #{this} to be undefined'
+ , 'expected #{this} not to be undefined'
+ );
+ });
+
+ /**
+ * ### .NaN
+ *
+ * Asserts that the target is exactly `NaN`.
+ *
+ * expect(NaN).to.be.NaN;
+ *
+ * Add `.not` earlier in the chain to negate `.NaN`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `NaN`.
+ *
+ * expect('foo').to.equal('foo'); // Recommended
+ * expect('foo').to.not.be.NaN; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.NaN;
+ *
+ * @name NaN
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('NaN', function () {
+ this.assert(
+ _.isNaN(flag(this, 'object'))
+ , 'expected #{this} to be NaN'
+ , 'expected #{this} not to be NaN'
+ );
+ });
+
+ /**
+ * ### .exist
+ *
+ * Asserts that the target is not strictly (`===`) equal to either `null` or
+ * `undefined`. However, it's often best to assert that the target is equal to
+ * its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.exist; // Not recommended
+ *
+ * expect(0).to.equal(0); // Recommended
+ * expect(0).to.exist; // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.exist`.
+ *
+ * expect(null).to.be.null; // Recommended
+ * expect(null).to.not.exist; // Not recommended
+ *
+ * expect(undefined).to.be.undefined; // Recommended
+ * expect(undefined).to.not.exist; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(null, 'nooo why fail??').to.exist;
+ *
+ * @name exist
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('exist', function () {
+ var val = flag(this, 'object');
+ this.assert(
+ val !== null && val !== undefined
+ , 'expected #{this} to exist'
+ , 'expected #{this} to not exist'
+ );
+ });
+
+ /**
+ * ### .empty
+ *
+ * When the target is a string or array, `.empty` asserts that the target's
+ * `length` property is strictly (`===`) equal to `0`.
+ *
+ * expect([]).to.be.empty;
+ * expect('').to.be.empty;
+ *
+ * When the target is a map or set, `.empty` asserts that the target's `size`
+ * property is strictly equal to `0`.
+ *
+ * expect(new Set()).to.be.empty;
+ * expect(new Map()).to.be.empty;
+ *
+ * When the target is a non-function object, `.empty` asserts that the target
+ * doesn't have any own enumerable properties. Properties with Symbol-based
+ * keys are excluded from the count.
+ *
+ * expect({}).to.be.empty;
+ *
+ * Because `.empty` does different things based on the target's type, it's
+ * important to check the target's type before using `.empty`. See the `.a`
+ * doc for info on testing a target's type.
+ *
+ * expect([]).to.be.an('array').that.is.empty;
+ *
+ * Add `.not` earlier in the chain to negate `.empty`. However, it's often
+ * best to assert that the target contains its expected number of values,
+ * rather than asserting that it's not empty.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.not.be.empty; // Not recommended
+ *
+ * expect(new Set([1, 2, 3])).to.have.property('size', 3); // Recommended
+ * expect(new Set([1, 2, 3])).to.not.be.empty; // Not recommended
+ *
+ * expect(Object.keys({a: 1})).to.have.lengthOf(1); // Recommended
+ * expect({a: 1}).to.not.be.empty; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect([1, 2, 3], 'nooo why fail??').to.be.empty;
+ *
+ * @name empty
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('empty', function () {
+ var val = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , flagMsg = flag(this, 'message')
+ , itemsCount;
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ switch (_.type(val).toLowerCase()) {
+ case 'array':
+ case 'string':
+ itemsCount = val.length;
+ break;
+ case 'map':
+ case 'set':
+ itemsCount = val.size;
+ break;
+ case 'weakmap':
+ case 'weakset':
+ throw new AssertionError(
+ flagMsg + '.empty was passed a weak collection',
+ undefined,
+ ssfi
+ );
+ case 'function':
+ var msg = flagMsg + '.empty was passed a function ' + _.getName(val);
+ throw new AssertionError(msg.trim(), undefined, ssfi);
+ default:
+ if (val !== Object(val)) {
+ throw new AssertionError(
+ flagMsg + '.empty was passed non-string primitive ' + _.inspect(val),
+ undefined,
+ ssfi
+ );
+ }
+ itemsCount = Object.keys(val).length;
+ }
+
+ this.assert(
+ 0 === itemsCount
+ , 'expected #{this} to be empty'
+ , 'expected #{this} not to be empty'
+ );
+ });
+
+ /**
+ * ### .arguments
+ *
+ * Asserts that the target is an `arguments` object.
+ *
+ * function test () {
+ * expect(arguments).to.be.arguments;
+ * }
+ *
+ * test();
+ *
+ * Add `.not` earlier in the chain to negate `.arguments`. However, it's often
+ * best to assert which type the target is expected to be, rather than
+ * asserting that its not an `arguments` object.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.arguments; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({}, 'nooo why fail??').to.be.arguments;
+ *
+ * The alias `.Arguments` can be used interchangeably with `.arguments`.
+ *
+ * @name arguments
+ * @alias Arguments
+ * @namespace BDD
+ * @api public
+ */
+
+ function checkArguments () {
+ var obj = flag(this, 'object')
+ , type = _.type(obj);
+ this.assert(
+ 'Arguments' === type
+ , 'expected #{this} to be arguments but got ' + type
+ , 'expected #{this} to not be arguments'
+ );
+ }
+
+ Assertion.addProperty('arguments', checkArguments);
+ Assertion.addProperty('Arguments', checkArguments);
+
+ /**
+ * ### .equal(val[, msg])
+ *
+ * Asserts that the target is strictly (`===`) equal to the given `val`.
+ *
+ * expect(1).to.equal(1);
+ * expect('foo').to.equal('foo');
+ *
+ * Add `.deep` earlier in the chain to use deep equality instead. See the
+ * `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) equals `{a: 1}`
+ * expect({a: 1}).to.deep.equal({a: 1});
+ * expect({a: 1}).to.not.equal({a: 1});
+ *
+ * // Target array deeply (but not strictly) equals `[1, 2]`
+ * expect([1, 2]).to.deep.equal([1, 2]);
+ * expect([1, 2]).to.not.equal([1, 2]);
+ *
+ * Add `.not` earlier in the chain to negate `.equal`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to one of countless unexpected values.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.equal(2); // Not recommended
+ *
+ * `.equal` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.equal(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.equal(2);
+ *
+ * The aliases `.equals` and `eq` can be used interchangeably with `.equal`.
+ *
+ * @name equal
+ * @alias equals
+ * @alias eq
+ * @param {Mixed} val
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertEqual (val, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ if (flag(this, 'deep')) {
+ var prevLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ this.eql(val);
+ flag(this, 'lockSsfi', prevLockSsfi);
+ } else {
+ this.assert(
+ val === obj
+ , 'expected #{this} to equal #{exp}'
+ , 'expected #{this} to not equal #{exp}'
+ , val
+ , this._obj
+ , true
+ );
+ }
+ }
+
+ Assertion.addMethod('equal', assertEqual);
+ Assertion.addMethod('equals', assertEqual);
+ Assertion.addMethod('eq', assertEqual);
+
+ /**
+ * ### .eql(obj[, msg])
+ *
+ * Asserts that the target is deeply equal to the given `obj`. See the
+ * `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target object is deeply (but not strictly) equal to {a: 1}
+ * expect({a: 1}).to.eql({a: 1}).but.not.equal({a: 1});
+ *
+ * // Target array is deeply (but not strictly) equal to [1, 2]
+ * expect([1, 2]).to.eql([1, 2]).but.not.equal([1, 2]);
+ *
+ * Add `.not` earlier in the chain to negate `.eql`. However, it's often best
+ * to assert that the target is deeply equal to its expected value, rather
+ * than not deeply equal to one of countless unexpected values.
+ *
+ * expect({a: 1}).to.eql({a: 1}); // Recommended
+ * expect({a: 1}).to.not.eql({b: 2}); // Not recommended
+ *
+ * `.eql` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect({a: 1}).to.eql({b: 2}, 'nooo why fail??');
+ * expect({a: 1}, 'nooo why fail??').to.eql({b: 2});
+ *
+ * The alias `.eqls` can be used interchangeably with `.eql`.
+ *
+ * The `.deep.equal` assertion is almost identical to `.eql` but with one
+ * difference: `.deep.equal` causes deep equality comparisons to also be used
+ * for any other assertions that follow in the chain.
+ *
+ * @name eql
+ * @alias eqls
+ * @param {Mixed} obj
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertEql(obj, msg) {
+ if (msg) flag(this, 'message', msg);
+ this.assert(
+ _.eql(obj, flag(this, 'object'))
+ , 'expected #{this} to deeply equal #{exp}'
+ , 'expected #{this} to not deeply equal #{exp}'
+ , obj
+ , this._obj
+ , true
+ );
+ }
+
+ Assertion.addMethod('eql', assertEql);
+ Assertion.addMethod('eqls', assertEql);
+
+ /**
+ * ### .above(n[, msg])
+ *
+ * Asserts that the target is a number or a date greater than the given number or date `n` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.above(1); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.above(2); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.above(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.above`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(1).to.not.be.above(2); // Not recommended
+ *
+ * `.above` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.above(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.above(2);
+ *
+ * The aliases `.gt` and `.greaterThan` can be used interchangeably with
+ * `.above`.
+ *
+ * @name above
+ * @alias gt
+ * @alias greaterThan
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertAbove (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to above must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to above must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount > n
+ , 'expected #{this} to have a ' + descriptor + ' above #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' above #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj > n
+ , 'expected #{this} to be above #{exp}'
+ , 'expected #{this} to be at most #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('above', assertAbove);
+ Assertion.addMethod('gt', assertAbove);
+ Assertion.addMethod('greaterThan', assertAbove);
+
+ /**
+ * ### .least(n[, msg])
+ *
+ * Asserts that the target is a number or a date greater than or equal to the given
+ * number or date `n` respectively. However, it's often best to assert that the target is equal to
+ * its expected value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.at.least(1); // Not recommended
+ * expect(2).to.be.at.least(2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than or equal to the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.at.least(2); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.at.least(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.least`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.at.least(2); // Not recommended
+ *
+ * `.least` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.at.least(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.at.least(2);
+ *
+ * The alias `.gte` can be used interchangeably with `.least`.
+ *
+ * @name least
+ * @alias gte
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertLeast (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to least must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to least must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount >= n
+ , 'expected #{this} to have a ' + descriptor + ' at least #{exp} but got #{act}'
+ , 'expected #{this} to have a ' + descriptor + ' below #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj >= n
+ , 'expected #{this} to be at least #{exp}'
+ , 'expected #{this} to be below #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('least', assertLeast);
+ Assertion.addMethod('gte', assertLeast);
+
+ /**
+ * ### .below(n[, msg])
+ *
+ * Asserts that the target is a number or a date less than the given number or date `n` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.below(2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is less than the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.below(4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.length(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.below(4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.below`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.be.below(1); // Not recommended
+ *
+ * `.below` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(2).to.be.below(1, 'nooo why fail??');
+ * expect(2, 'nooo why fail??').to.be.below(1);
+ *
+ * The aliases `.lt` and `.lessThan` can be used interchangeably with
+ * `.below`.
+ *
+ * @name below
+ * @alias lt
+ * @alias lessThan
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertBelow (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to below must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to below must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount < n
+ , 'expected #{this} to have a ' + descriptor + ' below #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' below #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj < n
+ , 'expected #{this} to be below #{exp}'
+ , 'expected #{this} to be at least #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('below', assertBelow);
+ Assertion.addMethod('lt', assertBelow);
+ Assertion.addMethod('lessThan', assertBelow);
+
+ /**
+ * ### .most(n[, msg])
+ *
+ * Asserts that the target is a number or a date less than or equal to the given number
+ * or date `n` respectively. However, it's often best to assert that the target is equal to its
+ * expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.at.most(2); // Not recommended
+ * expect(1).to.be.at.most(1); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is less than or equal to the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.at.most(4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.at.most(4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.most`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.be.at.most(1); // Not recommended
+ *
+ * `.most` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(2).to.be.at.most(1, 'nooo why fail??');
+ * expect(2, 'nooo why fail??').to.be.at.most(1);
+ *
+ * The alias `.lte` can be used interchangeably with `.most`.
+ *
+ * @name most
+ * @alias lte
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertMost (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to most must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to most must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount <= n
+ , 'expected #{this} to have a ' + descriptor + ' at most #{exp} but got #{act}'
+ , 'expected #{this} to have a ' + descriptor + ' above #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj <= n
+ , 'expected #{this} to be at most #{exp}'
+ , 'expected #{this} to be above #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('most', assertMost);
+ Assertion.addMethod('lte', assertMost);
+
+ /**
+ * ### .within(start, finish[, msg])
+ *
+ * Asserts that the target is a number or a date greater than or equal to the given
+ * number or date `start`, and less than or equal to the given number or date `finish` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.within(1, 3); // Not recommended
+ * expect(2).to.be.within(2, 3); // Not recommended
+ * expect(2).to.be.within(1, 2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than or equal to the given number `start`, and less
+ * than or equal to the given number `finish`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.within(2, 4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.within(2, 4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.within`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.within(2, 4); // Not recommended
+ *
+ * `.within` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(4).to.be.within(1, 3, 'nooo why fail??');
+ * expect(4, 'nooo why fail??').to.be.within(1, 3);
+ *
+ * @name within
+ * @param {Number} start lower bound inclusive
+ * @param {Number} finish upper bound inclusive
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('within', function (start, finish, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , startType = _.type(start).toLowerCase()
+ , finishType = _.type(finish).toLowerCase()
+ , errorMessage
+ , shouldThrow = true
+ , range = (startType === 'date' && finishType === 'date')
+ ? start.toUTCString() + '..' + finish.toUTCString()
+ : start + '..' + finish;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && (startType !== 'date' || finishType !== 'date'))) {
+ errorMessage = msgPrefix + 'the arguments to within must be dates';
+ } else if ((startType !== 'number' || finishType !== 'number') && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the arguments to within must be numbers';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount >= start && itemsCount <= finish
+ , 'expected #{this} to have a ' + descriptor + ' within ' + range
+ , 'expected #{this} to not have a ' + descriptor + ' within ' + range
+ );
+ } else {
+ this.assert(
+ obj >= start && obj <= finish
+ , 'expected #{this} to be within ' + range
+ , 'expected #{this} to not be within ' + range
+ );
+ }
+ });
+
+ /**
+ * ### .instanceof(constructor[, msg])
+ *
+ * Asserts that the target is an instance of the given `constructor`.
+ *
+ * function Cat () { }
+ *
+ * expect(new Cat()).to.be.an.instanceof(Cat);
+ * expect([1, 2]).to.be.an.instanceof(Array);
+ *
+ * Add `.not` earlier in the chain to negate `.instanceof`.
+ *
+ * expect({a: 1}).to.not.be.an.instanceof(Array);
+ *
+ * `.instanceof` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1).to.be.an.instanceof(Array, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.an.instanceof(Array);
+ *
+ * Due to limitations in ES5, `.instanceof` may not always work as expected
+ * when using a transpiler such as Babel or TypeScript. In particular, it may
+ * produce unexpected results when subclassing built-in object such as
+ * `Array`, `Error`, and `Map`. See your transpiler's docs for details:
+ *
+ * - ([Babel](https://babeljs.io/docs/usage/caveats/#classes))
+ * - ([TypeScript](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work))
+ *
+ * The alias `.instanceOf` can be used interchangeably with `.instanceof`.
+ *
+ * @name instanceof
+ * @param {Constructor} constructor
+ * @param {String} msg _optional_
+ * @alias instanceOf
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertInstanceOf (constructor, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var target = flag(this, 'object')
+ var ssfi = flag(this, 'ssfi');
+ var flagMsg = flag(this, 'message');
+
+ try {
+ var isInstanceOf = target instanceof constructor;
+ } catch (err) {
+ if (err instanceof TypeError) {
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ throw new AssertionError(
+ flagMsg + 'The instanceof assertion needs a constructor but '
+ + _.type(constructor) + ' was given.',
+ undefined,
+ ssfi
+ );
+ }
+ throw err;
+ }
+
+ var name = _.getName(constructor);
+ if (name === null) {
+ name = 'an unnamed constructor';
+ }
+
+ this.assert(
+ isInstanceOf
+ , 'expected #{this} to be an instance of ' + name
+ , 'expected #{this} to not be an instance of ' + name
+ );
+ };
+
+ Assertion.addMethod('instanceof', assertInstanceOf);
+ Assertion.addMethod('instanceOf', assertInstanceOf);
+
+ /**
+ * ### .property(name[, val[, msg]])
+ *
+ * Asserts that the target has a property with the given key `name`.
+ *
+ * expect({a: 1}).to.have.property('a');
+ *
+ * When `val` is provided, `.property` also asserts that the property's value
+ * is equal to the given `val`.
+ *
+ * expect({a: 1}).to.have.property('a', 1);
+ *
+ * By default, strict (`===`) equality is used. Add `.deep` earlier in the
+ * chain to use deep equality instead. See the `deep-eql` project page for
+ * info on the deep equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) has property `x: {a: 1}`
+ * expect({x: {a: 1}}).to.have.deep.property('x', {a: 1});
+ * expect({x: {a: 1}}).to.not.have.property('x', {a: 1});
+ *
+ * The target's enumerable and non-enumerable properties are always included
+ * in the search. By default, both own and inherited properties are included.
+ * Add `.own` earlier in the chain to exclude inherited properties from the
+ * search.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.have.own.property('a');
+ * expect({a: 1}).to.have.own.property('a', 1);
+ * expect({a: 1}).to.have.property('b');
+ * expect({a: 1}).to.not.have.own.property('b');
+ *
+ * `.deep` and `.own` can be combined.
+ *
+ * expect({x: {a: 1}}).to.have.deep.own.property('x', {a: 1});
+ *
+ * Add `.nested` earlier in the chain to enable dot- and bracket-notation when
+ * referencing nested properties.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]');
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]', 'y');
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 'x'}}).to.have.nested.property('\\.a.\\[b\\]');
+ *
+ * `.deep` and `.nested` can be combined.
+ *
+ * expect({a: {b: [{c: 3}]}})
+ * .to.have.deep.nested.property('a.b[0]', {c: 3});
+ *
+ * `.own` and `.nested` cannot be combined.
+ *
+ * Add `.not` earlier in the chain to negate `.property`.
+ *
+ * expect({a: 1}).to.not.have.property('b');
+ *
+ * However, it's dangerous to negate `.property` when providing `val`. The
+ * problem is that it creates uncertain expectations by asserting that the
+ * target either doesn't have a property with the given key `name`, or that it
+ * does have a property with the given key `name` but its value isn't equal to
+ * the given `val`. It's often best to identify the exact output that's
+ * expected, and then write an assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to have a property with the given key
+ * `name`, it's often best to assert exactly that.
+ *
+ * expect({b: 2}).to.not.have.property('a'); // Recommended
+ * expect({b: 2}).to.not.have.property('a', 1); // Not recommended
+ *
+ * When the target is expected to have a property with the given key `name`,
+ * it's often best to assert that the property has its expected value, rather
+ * than asserting that it doesn't have one of many unexpected values.
+ *
+ * expect({a: 3}).to.have.property('a', 3); // Recommended
+ * expect({a: 3}).to.not.have.property('a', 1); // Not recommended
+ *
+ * `.property` changes the target of any assertions that follow in the chain
+ * to be the value of the property from the original target object.
+ *
+ * expect({a: 1}).to.have.property('a').that.is.a('number');
+ *
+ * `.property` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing `val`, only use the
+ * second form.
+ *
+ * // Recommended
+ * expect({a: 1}).to.have.property('a', 2, 'nooo why fail??');
+ * expect({a: 1}, 'nooo why fail??').to.have.property('a', 2);
+ * expect({a: 1}, 'nooo why fail??').to.have.property('b');
+ *
+ * // Not recommended
+ * expect({a: 1}).to.have.property('b', undefined, 'nooo why fail??');
+ *
+ * The above assertion isn't the same thing as not providing `val`. Instead,
+ * it's asserting that the target object has a `b` property that's equal to
+ * `undefined`.
+ *
+ * The assertions `.ownProperty` and `.haveOwnProperty` can be used
+ * interchangeably with `.own.property`.
+ *
+ * @name property
+ * @param {String} name
+ * @param {Mixed} val (optional)
+ * @param {String} msg _optional_
+ * @returns value of property for chaining
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertProperty (name, val, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var isNested = flag(this, 'nested')
+ , isOwn = flag(this, 'own')
+ , flagMsg = flag(this, 'message')
+ , obj = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , nameType = typeof name;
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ if (isNested) {
+ if (nameType !== 'string') {
+ throw new AssertionError(
+ flagMsg + 'the argument to property must be a string when using nested syntax',
+ undefined,
+ ssfi
+ );
+ }
+ } else {
+ if (nameType !== 'string' && nameType !== 'number' && nameType !== 'symbol') {
+ throw new AssertionError(
+ flagMsg + 'the argument to property must be a string, number, or symbol',
+ undefined,
+ ssfi
+ );
+ }
+ }
+
+ if (isNested && isOwn) {
+ throw new AssertionError(
+ flagMsg + 'The "nested" and "own" flags cannot be combined.',
+ undefined,
+ ssfi
+ );
+ }
+
+ if (obj === null || obj === undefined) {
+ throw new AssertionError(
+ flagMsg + 'Target cannot be null or undefined.',
+ undefined,
+ ssfi
+ );
+ }
+
+ var isDeep = flag(this, 'deep')
+ , negate = flag(this, 'negate')
+ , pathInfo = isNested ? _.getPathInfo(obj, name) : null
+ , value = isNested ? pathInfo.value : obj[name];
+
+ var descriptor = '';
+ if (isDeep) descriptor += 'deep ';
+ if (isOwn) descriptor += 'own ';
+ if (isNested) descriptor += 'nested ';
+ descriptor += 'property ';
+
+ var hasProperty;
+ if (isOwn) hasProperty = Object.prototype.hasOwnProperty.call(obj, name);
+ else if (isNested) hasProperty = pathInfo.exists;
+ else hasProperty = _.hasProperty(obj, name);
+
+ // When performing a negated assertion for both name and val, merely having
+ // a property with the given name isn't enough to cause the assertion to
+ // fail. It must both have a property with the given name, and the value of
+ // that property must equal the given val. Therefore, skip this assertion in
+ // favor of the next.
+ if (!negate || arguments.length === 1) {
+ this.assert(
+ hasProperty
+ , 'expected #{this} to have ' + descriptor + _.inspect(name)
+ , 'expected #{this} to not have ' + descriptor + _.inspect(name));
+ }
+
+ if (arguments.length > 1) {
+ this.assert(
+ hasProperty && (isDeep ? _.eql(val, value) : val === value)
+ , 'expected #{this} to have ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
+ , 'expected #{this} to not have ' + descriptor + _.inspect(name) + ' of #{act}'
+ , val
+ , value
+ );
+ }
+
+ flag(this, 'object', value);
+ }
+
+ Assertion.addMethod('property', assertProperty);
+
+ function assertOwnProperty (name, value, msg) {
+ flag(this, 'own', true);
+ assertProperty.apply(this, arguments);
+ }
+
+ Assertion.addMethod('ownProperty', assertOwnProperty);
+ Assertion.addMethod('haveOwnProperty', assertOwnProperty);
+
+ /**
+ * ### .ownPropertyDescriptor(name[, descriptor[, msg]])
+ *
+ * Asserts that the target has its own property descriptor with the given key
+ * `name`. Enumerable and non-enumerable properties are included in the
+ * search.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a');
+ *
+ * When `descriptor` is provided, `.ownPropertyDescriptor` also asserts that
+ * the property's descriptor is deeply equal to the given `descriptor`. See
+ * the `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * Add `.not` earlier in the chain to negate `.ownPropertyDescriptor`.
+ *
+ * expect({a: 1}).to.not.have.ownPropertyDescriptor('b');
+ *
+ * However, it's dangerous to negate `.ownPropertyDescriptor` when providing
+ * a `descriptor`. The problem is that it creates uncertain expectations by
+ * asserting that the target either doesn't have a property descriptor with
+ * the given key `name`, or that it does have a property descriptor with the
+ * given key `name` but its not deeply equal to the given `descriptor`. It's
+ * often best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to have a property descriptor with the given
+ * key `name`, it's often best to assert exactly that.
+ *
+ * // Recommended
+ * expect({b: 2}).to.not.have.ownPropertyDescriptor('a');
+ *
+ * // Not recommended
+ * expect({b: 2}).to.not.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * When the target is expected to have a property descriptor with the given
+ * key `name`, it's often best to assert that the property has its expected
+ * descriptor, rather than asserting that it doesn't have one of many
+ * unexpected descriptors.
+ *
+ * // Recommended
+ * expect({a: 3}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 3,
+ * });
+ *
+ * // Not recommended
+ * expect({a: 3}).to.not.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * `.ownPropertyDescriptor` changes the target of any assertions that follow
+ * in the chain to be the value of the property descriptor from the original
+ * target object.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a')
+ * .that.has.property('enumerable', true);
+ *
+ * `.ownPropertyDescriptor` accepts an optional `msg` argument which is a
+ * custom error message to show when the assertion fails. The message can also
+ * be given as the second argument to `expect`. When not providing
+ * `descriptor`, only use the second form.
+ *
+ * // Recommended
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 2,
+ * }, 'nooo why fail??');
+ *
+ * // Recommended
+ * expect({a: 1}, 'nooo why fail??').to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 2,
+ * });
+ *
+ * // Recommended
+ * expect({a: 1}, 'nooo why fail??').to.have.ownPropertyDescriptor('b');
+ *
+ * // Not recommended
+ * expect({a: 1})
+ * .to.have.ownPropertyDescriptor('b', undefined, 'nooo why fail??');
+ *
+ * The above assertion isn't the same thing as not providing `descriptor`.
+ * Instead, it's asserting that the target object has a `b` property
+ * descriptor that's deeply equal to `undefined`.
+ *
+ * The alias `.haveOwnPropertyDescriptor` can be used interchangeably with
+ * `.ownPropertyDescriptor`.
+ *
+ * @name ownPropertyDescriptor
+ * @alias haveOwnPropertyDescriptor
+ * @param {String} name
+ * @param {Object} descriptor _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertOwnPropertyDescriptor (name, descriptor, msg) {
+ if (typeof descriptor === 'string') {
+ msg = descriptor;
+ descriptor = null;
+ }
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ var actualDescriptor = Object.getOwnPropertyDescriptor(Object(obj), name);
+ if (actualDescriptor && descriptor) {
+ this.assert(
+ _.eql(descriptor, actualDescriptor)
+ , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to match ' + _.inspect(descriptor) + ', got ' + _.inspect(actualDescriptor)
+ , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to not match ' + _.inspect(descriptor)
+ , descriptor
+ , actualDescriptor
+ , true
+ );
+ } else {
+ this.assert(
+ actualDescriptor
+ , 'expected #{this} to have an own property descriptor for ' + _.inspect(name)
+ , 'expected #{this} to not have an own property descriptor for ' + _.inspect(name)
+ );
+ }
+ flag(this, 'object', actualDescriptor);
+ }
+
+ Assertion.addMethod('ownPropertyDescriptor', assertOwnPropertyDescriptor);
+ Assertion.addMethod('haveOwnPropertyDescriptor', assertOwnPropertyDescriptor);
+
+ /**
+ * ### .lengthOf(n[, msg])
+ *
+ * Asserts that the target's `length` or `size` is equal to the given number
+ * `n`.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3);
+ * expect('foo').to.have.lengthOf(3);
+ * expect(new Set([1, 2, 3])).to.have.lengthOf(3);
+ * expect(new Map([['a', 1], ['b', 2], ['c', 3]])).to.have.lengthOf(3);
+ *
+ * Add `.not` earlier in the chain to negate `.lengthOf`. However, it's often
+ * best to assert that the target's `length` property is equal to its expected
+ * value, rather than not equal to one of many unexpected values.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.not.have.lengthOf(4); // Not recommended
+ *
+ * `.lengthOf` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(2, 'nooo why fail??');
+ * expect([1, 2, 3], 'nooo why fail??').to.have.lengthOf(2);
+ *
+ * `.lengthOf` can also be used as a language chain, causing all `.above`,
+ * `.below`, `.least`, `.most`, and `.within` assertions that follow in the
+ * chain to use the target's `length` property as the target. However, it's
+ * often best to assert that the target's `length` property is equal to its
+ * expected length, rather than asserting that its `length` property falls
+ * within some range of values.
+ *
+ * // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf(3);
+ *
+ * // Not recommended
+ * expect([1, 2, 3]).to.have.lengthOf.above(2);
+ * expect([1, 2, 3]).to.have.lengthOf.below(4);
+ * expect([1, 2, 3]).to.have.lengthOf.at.least(3);
+ * expect([1, 2, 3]).to.have.lengthOf.at.most(3);
+ * expect([1, 2, 3]).to.have.lengthOf.within(2,4);
+ *
+ * Due to a compatibility issue, the alias `.length` can't be chained directly
+ * off of an uninvoked method such as `.a`. Therefore, `.length` can't be used
+ * interchangeably with `.lengthOf` in every situation. It's recommended to
+ * always use `.lengthOf` instead of `.length`.
+ *
+ * expect([1, 2, 3]).to.have.a.length(3); // incompatible; throws error
+ * expect([1, 2, 3]).to.have.a.lengthOf(3); // passes as expected
+ *
+ * @name lengthOf
+ * @alias length
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertLengthChain () {
+ flag(this, 'doLength', true);
+ }
+
+ function assertLength (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , objType = _.type(obj).toLowerCase()
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi')
+ , descriptor = 'length'
+ , itemsCount;
+
+ switch (objType) {
+ case 'map':
+ case 'set':
+ descriptor = 'size';
+ itemsCount = obj.size;
+ break;
+ default:
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ itemsCount = obj.length;
+ }
+
+ this.assert(
+ itemsCount == n
+ , 'expected #{this} to have a ' + descriptor + ' of #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' of #{act}'
+ , n
+ , itemsCount
+ );
+ }
+
+ Assertion.addChainableMethod('length', assertLength, assertLengthChain);
+ Assertion.addChainableMethod('lengthOf', assertLength, assertLengthChain);
+
+ /**
+ * ### .match(re[, msg])
+ *
+ * Asserts that the target matches the given regular expression `re`.
+ *
+ * expect('foobar').to.match(/^foo/);
+ *
+ * Add `.not` earlier in the chain to negate `.match`.
+ *
+ * expect('foobar').to.not.match(/taco/);
+ *
+ * `.match` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect('foobar').to.match(/taco/, 'nooo why fail??');
+ * expect('foobar', 'nooo why fail??').to.match(/taco/);
+ *
+ * The alias `.matches` can be used interchangeably with `.match`.
+ *
+ * @name match
+ * @alias matches
+ * @param {RegExp} re
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+ function assertMatch(re, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ this.assert(
+ re.exec(obj)
+ , 'expected #{this} to match ' + re
+ , 'expected #{this} not to match ' + re
+ );
+ }
+
+ Assertion.addMethod('match', assertMatch);
+ Assertion.addMethod('matches', assertMatch);
+
+ /**
+ * ### .string(str[, msg])
+ *
+ * Asserts that the target string contains the given substring `str`.
+ *
+ * expect('foobar').to.have.string('bar');
+ *
+ * Add `.not` earlier in the chain to negate `.string`.
+ *
+ * expect('foobar').to.not.have.string('taco');
+ *
+ * `.string` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect('foobar').to.have.string('taco', 'nooo why fail??');
+ * expect('foobar', 'nooo why fail??').to.have.string('taco');
+ *
+ * @name string
+ * @param {String} str
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('string', function (str, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(obj, flagMsg, ssfi, true).is.a('string');
+
+ this.assert(
+ ~obj.indexOf(str)
+ , 'expected #{this} to contain ' + _.inspect(str)
+ , 'expected #{this} to not contain ' + _.inspect(str)
+ );
+ });
+
+ /**
+ * ### .keys(key1[, key2[, ...]])
+ *
+ * Asserts that the target object, array, map, or set has the given keys. Only
+ * the target's own inherited properties are included in the search.
+ *
+ * When the target is an object or array, keys can be provided as one or more
+ * string arguments, a single array argument, or a single object argument. In
+ * the latter case, only the keys in the given object matter; the values are
+ * ignored.
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ * expect(['x', 'y']).to.have.all.keys(0, 1);
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys(['a', 'b']);
+ * expect(['x', 'y']).to.have.all.keys([0, 1]);
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys({a: 4, b: 5}); // ignore 4 and 5
+ * expect(['x', 'y']).to.have.all.keys({0: 4, 1: 5}); // ignore 4 and 5
+ *
+ * When the target is a map or set, each key must be provided as a separate
+ * argument.
+ *
+ * expect(new Map([['a', 1], ['b', 2]])).to.have.all.keys('a', 'b');
+ * expect(new Set(['a', 'b'])).to.have.all.keys('a', 'b');
+ *
+ * Because `.keys` does different things based on the target's type, it's
+ * important to check the target's type before using `.keys`. See the `.a` doc
+ * for info on testing a target's type.
+ *
+ * expect({a: 1, b: 2}).to.be.an('object').that.has.all.keys('a', 'b');
+ *
+ * By default, strict (`===`) equality is used to compare keys of maps and
+ * sets. Add `.deep` earlier in the chain to use deep equality instead. See
+ * the `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target set deeply (but not strictly) has key `{a: 1}`
+ * expect(new Set([{a: 1}])).to.have.all.deep.keys([{a: 1}]);
+ * expect(new Set([{a: 1}])).to.not.have.all.keys([{a: 1}]);
+ *
+ * By default, the target must have all of the given keys and no more. Add
+ * `.any` earlier in the chain to only require that the target have at least
+ * one of the given keys. Also, add `.not` earlier in the chain to negate
+ * `.keys`. It's often best to add `.any` when negating `.keys`, and to use
+ * `.all` when asserting `.keys` without negation.
+ *
+ * When negating `.keys`, `.any` is preferred because `.not.any.keys` asserts
+ * exactly what's expected of the output, whereas `.not.all.keys` creates
+ * uncertain expectations.
+ *
+ * // Recommended; asserts that target doesn't have any of the given keys
+ * expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
+ *
+ * // Not recommended; asserts that target doesn't have all of the given
+ * // keys but may or may not have some of them
+ * expect({a: 1, b: 2}).to.not.have.all.keys('c', 'd');
+ *
+ * When asserting `.keys` without negation, `.all` is preferred because
+ * `.all.keys` asserts exactly what's expected of the output, whereas
+ * `.any.keys` creates uncertain expectations.
+ *
+ * // Recommended; asserts that target has all the given keys
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ *
+ * // Not recommended; asserts that target has at least one of the given
+ * // keys but may or may not have more of them
+ * expect({a: 1, b: 2}).to.have.any.keys('a', 'b');
+ *
+ * Note that `.all` is used by default when neither `.all` nor `.any` appear
+ * earlier in the chain. However, it's often best to add `.all` anyway because
+ * it improves readability.
+ *
+ * // Both assertions are identical
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b'); // Recommended
+ * expect({a: 1, b: 2}).to.have.keys('a', 'b'); // Not recommended
+ *
+ * Add `.include` earlier in the chain to require that the target's keys be a
+ * superset of the expected keys, rather than identical sets.
+ *
+ * // Target object's keys are a superset of ['a', 'b'] but not identical
+ * expect({a: 1, b: 2, c: 3}).to.include.all.keys('a', 'b');
+ * expect({a: 1, b: 2, c: 3}).to.not.have.all.keys('a', 'b');
+ *
+ * However, if `.any` and `.include` are combined, only the `.any` takes
+ * effect. The `.include` is ignored in this case.
+ *
+ * // Both assertions are identical
+ * expect({a: 1}).to.have.any.keys('a', 'b');
+ * expect({a: 1}).to.include.any.keys('a', 'b');
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.have.key('b');
+ *
+ * The alias `.key` can be used interchangeably with `.keys`.
+ *
+ * @name keys
+ * @alias key
+ * @param {...String|Array|Object} keys
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertKeys (keys) {
+ var obj = flag(this, 'object')
+ , objType = _.type(obj)
+ , keysType = _.type(keys)
+ , ssfi = flag(this, 'ssfi')
+ , isDeep = flag(this, 'deep')
+ , str
+ , deepStr = ''
+ , actual
+ , ok = true
+ , flagMsg = flag(this, 'message');
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ var mixedArgsMsg = flagMsg + 'when testing keys against an object or an array you must give a single Array|Object|String argument or multiple String arguments';
+
+ if (objType === 'Map' || objType === 'Set') {
+ deepStr = isDeep ? 'deeply ' : '';
+ actual = [];
+
+ // Map and Set '.keys' aren't supported in IE 11. Therefore, use .forEach.
+ obj.forEach(function (val, key) { actual.push(key) });
+
+ if (keysType !== 'Array') {
+ keys = Array.prototype.slice.call(arguments);
+ }
+ } else {
+ actual = _.getOwnEnumerableProperties(obj);
+
+ switch (keysType) {
+ case 'Array':
+ if (arguments.length > 1) {
+ throw new AssertionError(mixedArgsMsg, undefined, ssfi);
+ }
+ break;
+ case 'Object':
+ if (arguments.length > 1) {
+ throw new AssertionError(mixedArgsMsg, undefined, ssfi);
+ }
+ keys = Object.keys(keys);
+ break;
+ default:
+ keys = Array.prototype.slice.call(arguments);
+ }
+
+ // Only stringify non-Symbols because Symbols would become "Symbol()"
+ keys = keys.map(function (val) {
+ return typeof val === 'symbol' ? val : String(val);
+ });
+ }
+
+ if (!keys.length) {
+ throw new AssertionError(flagMsg + 'keys required', undefined, ssfi);
+ }
+
+ var len = keys.length
+ , any = flag(this, 'any')
+ , all = flag(this, 'all')
+ , expected = keys;
+
+ if (!any && !all) {
+ all = true;
+ }
+
+ // Has any
+ if (any) {
+ ok = expected.some(function(expectedKey) {
+ return actual.some(function(actualKey) {
+ if (isDeep) {
+ return _.eql(expectedKey, actualKey);
+ } else {
+ return expectedKey === actualKey;
+ }
+ });
+ });
+ }
+
+ // Has all
+ if (all) {
+ ok = expected.every(function(expectedKey) {
+ return actual.some(function(actualKey) {
+ if (isDeep) {
+ return _.eql(expectedKey, actualKey);
+ } else {
+ return expectedKey === actualKey;
+ }
+ });
+ });
+
+ if (!flag(this, 'contains')) {
+ ok = ok && keys.length == actual.length;
+ }
+ }
+
+ // Key string
+ if (len > 1) {
+ keys = keys.map(function(key) {
+ return _.inspect(key);
+ });
+ var last = keys.pop();
+ if (all) {
+ str = keys.join(', ') + ', and ' + last;
+ }
+ if (any) {
+ str = keys.join(', ') + ', or ' + last;
+ }
+ } else {
+ str = _.inspect(keys[0]);
+ }
+
+ // Form
+ str = (len > 1 ? 'keys ' : 'key ') + str;
+
+ // Have / include
+ str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
+
+ // Assertion
+ this.assert(
+ ok
+ , 'expected #{this} to ' + deepStr + str
+ , 'expected #{this} to not ' + deepStr + str
+ , expected.slice(0).sort(_.compareByInspect)
+ , actual.sort(_.compareByInspect)
+ , true
+ );
+ }
+
+ Assertion.addMethod('keys', assertKeys);
+ Assertion.addMethod('key', assertKeys);
+
+ /**
+ * ### .throw([errorLike], [errMsgMatcher], [msg])
+ *
+ * When no arguments are provided, `.throw` invokes the target function and
+ * asserts that an error is thrown.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw();
+ *
+ * When one argument is provided, and it's an error constructor, `.throw`
+ * invokes the target function and asserts that an error is thrown that's an
+ * instance of that error constructor.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(TypeError);
+ *
+ * When one argument is provided, and it's an error instance, `.throw` invokes
+ * the target function and asserts that an error is thrown that's strictly
+ * (`===`) equal to that error instance.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(err);
+ *
+ * When one argument is provided, and it's a string, `.throw` invokes the
+ * target function and asserts that an error is thrown with a message that
+ * contains that string.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw('salmon');
+ *
+ * When one argument is provided, and it's a regular expression, `.throw`
+ * invokes the target function and asserts that an error is thrown with a
+ * message that matches that regular expression.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(/salmon/);
+ *
+ * When two arguments are provided, and the first is an error instance or
+ * constructor, and the second is a string or regular expression, `.throw`
+ * invokes the function and asserts that an error is thrown that fulfills both
+ * conditions as described above.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(TypeError, 'salmon');
+ * expect(badFn).to.throw(TypeError, /salmon/);
+ * expect(badFn).to.throw(err, 'salmon');
+ * expect(badFn).to.throw(err, /salmon/);
+ *
+ * Add `.not` earlier in the chain to negate `.throw`.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.not.throw();
+ *
+ * However, it's dangerous to negate `.throw` when providing any arguments.
+ * The problem is that it creates uncertain expectations by asserting that the
+ * target either doesn't throw an error, or that it throws an error but of a
+ * different type than the given type, or that it throws an error of the given
+ * type but with a message that doesn't include the given string. It's often
+ * best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to throw an error, it's often best to assert
+ * exactly that.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.not.throw(); // Recommended
+ * expect(goodFn).to.not.throw(ReferenceError, 'x'); // Not recommended
+ *
+ * When the target is expected to throw an error, it's often best to assert
+ * that the error is of its expected type, and has a message that includes an
+ * expected string, rather than asserting that it doesn't have one of many
+ * unexpected types, and doesn't have a message that includes some string.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(TypeError, 'salmon'); // Recommended
+ * expect(badFn).to.not.throw(ReferenceError, 'x'); // Not recommended
+ *
+ * `.throw` changes the target of any assertions that follow in the chain to
+ * be the error object that's thrown.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * err.code = 42;
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(TypeError).with.property('code', 42);
+ *
+ * `.throw` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`. When not providing two arguments, always use
+ * the second form.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.throw(TypeError, 'x', 'nooo why fail??');
+ * expect(goodFn, 'nooo why fail??').to.throw();
+ *
+ * Due to limitations in ES5, `.throw` may not always work as expected when
+ * using a transpiler such as Babel or TypeScript. In particular, it may
+ * produce unexpected results when subclassing the built-in `Error` object and
+ * then passing the subclassed constructor to `.throw`. See your transpiler's
+ * docs for details:
+ *
+ * - ([Babel](https://babeljs.io/docs/usage/caveats/#classes))
+ * - ([TypeScript](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work))
+ *
+ * Beware of some common mistakes when using the `throw` assertion. One common
+ * mistake is to accidentally invoke the function yourself instead of letting
+ * the `throw` assertion invoke the function for you. For example, when
+ * testing if a function named `fn` throws, provide `fn` instead of `fn()` as
+ * the target for the assertion.
+ *
+ * expect(fn).to.throw(); // Good! Tests `fn` as desired
+ * expect(fn()).to.throw(); // Bad! Tests result of `fn()`, not `fn`
+ *
+ * If you need to assert that your function `fn` throws when passed certain
+ * arguments, then wrap a call to `fn` inside of another function.
+ *
+ * expect(function () { fn(42); }).to.throw(); // Function expression
+ * expect(() => fn(42)).to.throw(); // ES6 arrow function
+ *
+ * Another common mistake is to provide an object method (or any stand-alone
+ * function that relies on `this`) as the target of the assertion. Doing so is
+ * problematic because the `this` context will be lost when the function is
+ * invoked by `.throw`; there's no way for it to know what `this` is supposed
+ * to be. There are two ways around this problem. One solution is to wrap the
+ * method or function call inside of another function. Another solution is to
+ * use `bind`.
+ *
+ * expect(function () { cat.meow(); }).to.throw(); // Function expression
+ * expect(() => cat.meow()).to.throw(); // ES6 arrow function
+ * expect(cat.meow.bind(cat)).to.throw(); // Bind
+ *
+ * Finally, it's worth mentioning that it's a best practice in JavaScript to
+ * only throw `Error` and derivatives of `Error` such as `ReferenceError`,
+ * `TypeError`, and user-defined objects that extend `Error`. No other type of
+ * value will generate a stack trace when initialized. With that said, the
+ * `throw` assertion does technically support any type of value being thrown,
+ * not just `Error` and its derivatives.
+ *
+ * The aliases `.throws` and `.Throw` can be used interchangeably with
+ * `.throw`.
+ *
+ * @name throw
+ * @alias throws
+ * @alias Throw
+ * @param {Error|ErrorConstructor} errorLike
+ * @param {String|RegExp} errMsgMatcher error message
+ * @param {String} msg _optional_
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @returns error for chaining (null if no error)
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertThrows (errorLike, errMsgMatcher, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , flagMsg = flag(this, 'message')
+ , negate = flag(this, 'negate') || false;
+ new Assertion(obj, flagMsg, ssfi, true).is.a('function');
+
+ if (errorLike instanceof RegExp || typeof errorLike === 'string') {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ var caughtErr;
+ try {
+ obj();
+ } catch (err) {
+ caughtErr = err;
+ }
+
+ // If we have the negate flag enabled and at least one valid argument it means we do expect an error
+ // but we want it to match a given set of criteria
+ var everyArgIsUndefined = errorLike === undefined && errMsgMatcher === undefined;
+
+ // If we've got the negate flag enabled and both args, we should only fail if both aren't compatible
+ // See Issue #551 and PR #683@GitHub
+ var everyArgIsDefined = Boolean(errorLike && errMsgMatcher);
+ var errorLikeFail = false;
+ var errMsgMatcherFail = false;
+
+ // Checking if error was thrown
+ if (everyArgIsUndefined || !everyArgIsUndefined && !negate) {
+ // We need this to display results correctly according to their types
+ var errorLikeString = 'an error';
+ if (errorLike instanceof Error) {
+ errorLikeString = '#{exp}';
+ } else if (errorLike) {
+ errorLikeString = _.checkError.getConstructorName(errorLike);
+ }
+
+ this.assert(
+ caughtErr
+ , 'expected #{this} to throw ' + errorLikeString
+ , 'expected #{this} to not throw an error but #{act} was thrown'
+ , errorLike && errorLike.toString()
+ , (caughtErr instanceof Error ?
+ caughtErr.toString() : (typeof caughtErr === 'string' ? caughtErr : caughtErr &&
+ _.checkError.getConstructorName(caughtErr)))
+ );
+ }
+
+ if (errorLike && caughtErr) {
+ // We should compare instances only if `errorLike` is an instance of `Error`
+ if (errorLike instanceof Error) {
+ var isCompatibleInstance = _.checkError.compatibleInstance(caughtErr, errorLike);
+
+ if (isCompatibleInstance === negate) {
+ // These checks were created to ensure we won't fail too soon when we've got both args and a negate
+ // See Issue #551 and PR #683@GitHub
+ if (everyArgIsDefined && negate) {
+ errorLikeFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr && !negate ? ' but #{act} was thrown' : '')
+ , errorLike.toString()
+ , caughtErr.toString()
+ );
+ }
+ }
+ }
+
+ var isCompatibleConstructor = _.checkError.compatibleConstructor(caughtErr, errorLike);
+ if (isCompatibleConstructor === negate) {
+ if (everyArgIsDefined && negate) {
+ errorLikeFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr ? ' but #{act} was thrown' : '')
+ , (errorLike instanceof Error ? errorLike.toString() : errorLike && _.checkError.getConstructorName(errorLike))
+ , (caughtErr instanceof Error ? caughtErr.toString() : caughtErr && _.checkError.getConstructorName(caughtErr))
+ );
+ }
+ }
+ }
+
+ if (caughtErr && errMsgMatcher !== undefined && errMsgMatcher !== null) {
+ // Here we check compatible messages
+ var placeholder = 'including';
+ if (errMsgMatcher instanceof RegExp) {
+ placeholder = 'matching'
+ }
+
+ var isCompatibleMessage = _.checkError.compatibleMessage(caughtErr, errMsgMatcher);
+ if (isCompatibleMessage === negate) {
+ if (everyArgIsDefined && negate) {
+ errMsgMatcherFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw error ' + placeholder + ' #{exp} but got #{act}'
+ , 'expected #{this} to throw error not ' + placeholder + ' #{exp}'
+ , errMsgMatcher
+ , _.checkError.getMessage(caughtErr)
+ );
+ }
+ }
+ }
+
+ // If both assertions failed and both should've matched we throw an error
+ if (errorLikeFail && errMsgMatcherFail) {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr ? ' but #{act} was thrown' : '')
+ , (errorLike instanceof Error ? errorLike.toString() : errorLike && _.checkError.getConstructorName(errorLike))
+ , (caughtErr instanceof Error ? caughtErr.toString() : caughtErr && _.checkError.getConstructorName(caughtErr))
+ );
+ }
+
+ flag(this, 'object', caughtErr);
+ };
+
+ Assertion.addMethod('throw', assertThrows);
+ Assertion.addMethod('throws', assertThrows);
+ Assertion.addMethod('Throw', assertThrows);
+
+ /**
+ * ### .respondTo(method[, msg])
+ *
+ * When the target is a non-function object, `.respondTo` asserts that the
+ * target has a method with the given name `method`. The method can be own or
+ * inherited, and it can be enumerable or non-enumerable.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(new Cat()).to.respondTo('meow');
+ *
+ * When the target is a function, `.respondTo` asserts that the target's
+ * `prototype` property has a method with the given name `method`. Again, the
+ * method can be own or inherited, and it can be enumerable or non-enumerable.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(Cat).to.respondTo('meow');
+ *
+ * Add `.itself` earlier in the chain to force `.respondTo` to treat the
+ * target as a non-function object, even if it's a function. Thus, it asserts
+ * that the target has a method with the given name `method`, rather than
+ * asserting that the target's `prototype` property has a method with the
+ * given name `method`.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ * Cat.hiss = function () {};
+ *
+ * expect(Cat).itself.to.respondTo('hiss').but.not.respondTo('meow');
+ *
+ * When not adding `.itself`, it's important to check the target's type before
+ * using `.respondTo`. See the `.a` doc for info on checking a target's type.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(new Cat()).to.be.an('object').that.respondsTo('meow');
+ *
+ * Add `.not` earlier in the chain to negate `.respondTo`.
+ *
+ * function Dog () {}
+ * Dog.prototype.bark = function () {};
+ *
+ * expect(new Dog()).to.not.respondTo('meow');
+ *
+ * `.respondTo` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect({}).to.respondTo('meow', 'nooo why fail??');
+ * expect({}, 'nooo why fail??').to.respondTo('meow');
+ *
+ * The alias `.respondsTo` can be used interchangeably with `.respondTo`.
+ *
+ * @name respondTo
+ * @alias respondsTo
+ * @param {String} method
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function respondTo (method, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , itself = flag(this, 'itself')
+ , context = ('function' === typeof obj && !itself)
+ ? obj.prototype[method]
+ : obj[method];
+
+ this.assert(
+ 'function' === typeof context
+ , 'expected #{this} to respond to ' + _.inspect(method)
+ , 'expected #{this} to not respond to ' + _.inspect(method)
+ );
+ }
+
+ Assertion.addMethod('respondTo', respondTo);
+ Assertion.addMethod('respondsTo', respondTo);
+
+ /**
+ * ### .itself
+ *
+ * Forces all `.respondTo` assertions that follow in the chain to behave as if
+ * the target is a non-function object, even if it's a function. Thus, it
+ * causes `.respondTo` to assert that the target has a method with the given
+ * name, rather than asserting that the target's `prototype` property has a
+ * method with the given name.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ * Cat.hiss = function () {};
+ *
+ * expect(Cat).itself.to.respondTo('hiss').but.not.respondTo('meow');
+ *
+ * @name itself
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('itself', function () {
+ flag(this, 'itself', true);
+ });
+
+ /**
+ * ### .satisfy(matcher[, msg])
+ *
+ * Invokes the given `matcher` function with the target being passed as the
+ * first argument, and asserts that the value returned is truthy.
+ *
+ * expect(1).to.satisfy(function(num) {
+ * return num > 0;
+ * });
+ *
+ * Add `.not` earlier in the chain to negate `.satisfy`.
+ *
+ * expect(1).to.not.satisfy(function(num) {
+ * return num > 2;
+ * });
+ *
+ * `.satisfy` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1).to.satisfy(function(num) {
+ * return num > 2;
+ * }, 'nooo why fail??');
+ *
+ * expect(1, 'nooo why fail??').to.satisfy(function(num) {
+ * return num > 2;
+ * });
+ *
+ * The alias `.satisfies` can be used interchangeably with `.satisfy`.
+ *
+ * @name satisfy
+ * @alias satisfies
+ * @param {Function} matcher
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function satisfy (matcher, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ var result = matcher(obj);
+ this.assert(
+ result
+ , 'expected #{this} to satisfy ' + _.objDisplay(matcher)
+ , 'expected #{this} to not satisfy' + _.objDisplay(matcher)
+ , flag(this, 'negate') ? false : true
+ , result
+ );
+ }
+
+ Assertion.addMethod('satisfy', satisfy);
+ Assertion.addMethod('satisfies', satisfy);
+
+ /**
+ * ### .closeTo(expected, delta[, msg])
+ *
+ * Asserts that the target is a number that's within a given +/- `delta` range
+ * of the given number `expected`. However, it's often best to assert that the
+ * target is equal to its expected value.
+ *
+ * // Recommended
+ * expect(1.5).to.equal(1.5);
+ *
+ * // Not recommended
+ * expect(1.5).to.be.closeTo(1, 0.5);
+ * expect(1.5).to.be.closeTo(2, 0.5);
+ * expect(1.5).to.be.closeTo(1, 1);
+ *
+ * Add `.not` earlier in the chain to negate `.closeTo`.
+ *
+ * expect(1.5).to.equal(1.5); // Recommended
+ * expect(1.5).to.not.be.closeTo(3, 1); // Not recommended
+ *
+ * `.closeTo` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1.5).to.be.closeTo(3, 1, 'nooo why fail??');
+ * expect(1.5, 'nooo why fail??').to.be.closeTo(3, 1);
+ *
+ * The alias `.approximately` can be used interchangeably with `.closeTo`.
+ *
+ * @name closeTo
+ * @alias approximately
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function closeTo(expected, delta, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+
+ new Assertion(obj, flagMsg, ssfi, true).is.a('number');
+ if (typeof expected !== 'number' || typeof delta !== 'number') {
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ throw new AssertionError(
+ flagMsg + 'the arguments to closeTo or approximately must be numbers',
+ undefined,
+ ssfi
+ );
+ }
+
+ this.assert(
+ Math.abs(obj - expected) <= delta
+ , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
+ , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
+ );
+ }
+
+ Assertion.addMethod('closeTo', closeTo);
+ Assertion.addMethod('approximately', closeTo);
+
+ // Note: Duplicates are ignored if testing for inclusion instead of sameness.
+ function isSubsetOf(subset, superset, cmp, contains, ordered) {
+ if (!contains) {
+ if (subset.length !== superset.length) return false;
+ superset = superset.slice();
+ }
+
+ return subset.every(function(elem, idx) {
+ if (ordered) return cmp ? cmp(elem, superset[idx]) : elem === superset[idx];
+
+ if (!cmp) {
+ var matchIdx = superset.indexOf(elem);
+ if (matchIdx === -1) return false;
+
+ // Remove match from superset so not counted twice if duplicate in subset.
+ if (!contains) superset.splice(matchIdx, 1);
+ return true;
+ }
+
+ return superset.some(function(elem2, matchIdx) {
+ if (!cmp(elem, elem2)) return false;
+
+ // Remove match from superset so not counted twice if duplicate in subset.
+ if (!contains) superset.splice(matchIdx, 1);
+ return true;
+ });
+ });
+ }
+
+ /**
+ * ### .members(set[, msg])
+ *
+ * Asserts that the target array has the same members as the given array
+ * `set`.
+ *
+ * expect([1, 2, 3]).to.have.members([2, 1, 3]);
+ * expect([1, 2, 2]).to.have.members([2, 1, 2]);
+ *
+ * By default, members are compared using strict (`===`) equality. Add `.deep`
+ * earlier in the chain to use deep equality instead. See the `deep-eql`
+ * project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target array deeply (but not strictly) has member `{a: 1}`
+ * expect([{a: 1}]).to.have.deep.members([{a: 1}]);
+ * expect([{a: 1}]).to.not.have.members([{a: 1}]);
+ *
+ * By default, order doesn't matter. Add `.ordered` earlier in the chain to
+ * require that members appear in the same order.
+ *
+ * expect([1, 2, 3]).to.have.ordered.members([1, 2, 3]);
+ * expect([1, 2, 3]).to.have.members([2, 1, 3])
+ * .but.not.ordered.members([2, 1, 3]);
+ *
+ * By default, both arrays must be the same size. Add `.include` earlier in
+ * the chain to require that the target's members be a superset of the
+ * expected members. Note that duplicates are ignored in the subset when
+ * `.include` is added.
+ *
+ * // Target array is a superset of [1, 2] but not identical
+ * expect([1, 2, 3]).to.include.members([1, 2]);
+ * expect([1, 2, 3]).to.not.have.members([1, 2]);
+ *
+ * // Duplicates in the subset are ignored
+ * expect([1, 2, 3]).to.include.members([1, 2, 2, 2]);
+ *
+ * `.deep`, `.ordered`, and `.include` can all be combined. However, if
+ * `.include` and `.ordered` are combined, the ordering begins at the start of
+ * both arrays.
+ *
+ * expect([{a: 1}, {b: 2}, {c: 3}])
+ * .to.include.deep.ordered.members([{a: 1}, {b: 2}])
+ * .but.not.include.deep.ordered.members([{b: 2}, {c: 3}]);
+ *
+ * Add `.not` earlier in the chain to negate `.members`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the target array doesn't have all of the same members as
+ * the given array `set` but may or may not have some of them. It's often best
+ * to identify the exact output that's expected, and then write an assertion
+ * that only accepts that exact output.
+ *
+ * expect([1, 2]).to.not.include(3).and.not.include(4); // Recommended
+ * expect([1, 2]).to.not.have.members([3, 4]); // Not recommended
+ *
+ * `.members` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2]).to.have.members([1, 2, 3], 'nooo why fail??');
+ * expect([1, 2], 'nooo why fail??').to.have.members([1, 2, 3]);
+ *
+ * @name members
+ * @param {Array} set
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('members', function (subset, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+
+ new Assertion(obj, flagMsg, ssfi, true).to.be.an('array');
+ new Assertion(subset, flagMsg, ssfi, true).to.be.an('array');
+
+ var contains = flag(this, 'contains');
+ var ordered = flag(this, 'ordered');
+
+ var subject, failMsg, failNegateMsg;
+
+ if (contains) {
+ subject = ordered ? 'an ordered superset' : 'a superset';
+ failMsg = 'expected #{this} to be ' + subject + ' of #{exp}';
+ failNegateMsg = 'expected #{this} to not be ' + subject + ' of #{exp}';
+ } else {
+ subject = ordered ? 'ordered members' : 'members';
+ failMsg = 'expected #{this} to have the same ' + subject + ' as #{exp}';
+ failNegateMsg = 'expected #{this} to not have the same ' + subject + ' as #{exp}';
+ }
+
+ var cmp = flag(this, 'deep') ? _.eql : undefined;
+
+ this.assert(
+ isSubsetOf(subset, obj, cmp, contains, ordered)
+ , failMsg
+ , failNegateMsg
+ , subset
+ , obj
+ , true
+ );
+ });
+
+ /**
+ * ### .oneOf(list[, msg])
+ *
+ * Asserts that the target is a member of the given array `list`. However,
+ * it's often best to assert that the target is equal to its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.oneOf([1, 2, 3]); // Not recommended
+ *
+ * Comparisons are performed using strict (`===`) equality.
+ *
+ * Add `.not` earlier in the chain to negate `.oneOf`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.oneOf([2, 3, 4]); // Not recommended
+ *
+ * `.oneOf` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.oneOf([2, 3, 4], 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.oneOf([2, 3, 4]);
+ *
+ * @name oneOf
+ * @param {Array<*>} list
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function oneOf (list, msg) {
+ if (msg) flag(this, 'message', msg);
+ var expected = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(list, flagMsg, ssfi, true).to.be.an('array');
+
+ this.assert(
+ list.indexOf(expected) > -1
+ , 'expected #{this} to be one of #{exp}'
+ , 'expected #{this} to not be one of #{exp}'
+ , list
+ , expected
+ );
+ }
+
+ Assertion.addMethod('oneOf', oneOf);
+
+ /**
+ * ### .change(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.change` asserts that the given function
+ * `subject` returns a different value when it's invoked before the target
+ * function compared to when it's invoked afterward. However, it's often best
+ * to assert that `subject` is equal to its expected value.
+ *
+ * var dots = ''
+ * , addDot = function () { dots += '.'; }
+ * , getDots = function () { return dots; };
+ *
+ * // Recommended
+ * expect(getDots()).to.equal('');
+ * addDot();
+ * expect(getDots()).to.equal('.');
+ *
+ * // Not recommended
+ * expect(addDot).to.change(getDots);
+ *
+ * When two arguments are provided, `.change` asserts that the value of the
+ * given object `subject`'s `prop` property is different before invoking the
+ * target function compared to afterward.
+ *
+ * var myObj = {dots: ''}
+ * , addDot = function () { myObj.dots += '.'; };
+ *
+ * // Recommended
+ * expect(myObj).to.have.property('dots', '');
+ * addDot();
+ * expect(myObj).to.have.property('dots', '.');
+ *
+ * // Not recommended
+ * expect(addDot).to.change(myObj, 'dots');
+ *
+ * Strict (`===`) equality is used to compare before and after values.
+ *
+ * Add `.not` earlier in the chain to negate `.change`.
+ *
+ * var dots = ''
+ * , noop = function () {}
+ * , getDots = function () { return dots; };
+ *
+ * expect(noop).to.not.change(getDots);
+ *
+ * var myObj = {dots: ''}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'dots');
+ *
+ * `.change` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {dots: ''}
+ * , addDot = function () { myObj.dots += '.'; };
+ *
+ * expect(addDot).to.not.change(myObj, 'dots', 'nooo why fail??');
+ *
+ * var dots = ''
+ * , addDot = function () { dots += '.'; }
+ * , getDots = function () { return dots; };
+ *
+ * expect(addDot, 'nooo why fail??').to.not.change(getDots);
+ *
+ * `.change` also causes all `.by` assertions that follow in the chain to
+ * assert how much a numeric subject was increased or decreased by. However,
+ * it's dangerous to use `.change.by`. The problem is that it creates
+ * uncertain expectations by asserting that the subject either increases by
+ * the given delta, or that it decreases by the given delta. It's often best
+ * to identify the exact output that's expected, and then write an assertion
+ * that only accepts that exact output.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; }
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * The alias `.changes` can be used interchangeably with `.change`.
+ *
+ * @name change
+ * @alias changes
+ * @param {String} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertChanges (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ // This gets flagged because of the .by(delta) assertion
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'change');
+ flag(this, 'realDelta', final !== initial);
+
+ this.assert(
+ initial !== final
+ , 'expected ' + msgObj + ' to change'
+ , 'expected ' + msgObj + ' to not change'
+ );
+ }
+
+ Assertion.addMethod('change', assertChanges);
+ Assertion.addMethod('changes', assertChanges);
+
+ /**
+ * ### .increase(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.increase` asserts that the given function
+ * `subject` returns a greater number when it's invoked after invoking the
+ * target function compared to when it's invoked beforehand. `.increase` also
+ * causes all `.by` assertions that follow in the chain to assert how much
+ * greater of a number is returned. It's often best to assert that the return
+ * value increased by the expected amount, rather than asserting it increased
+ * by any amount.
+ *
+ * var val = 1
+ * , addTwo = function () { val += 2; }
+ * , getVal = function () { return val; };
+ *
+ * expect(addTwo).to.increase(getVal).by(2); // Recommended
+ * expect(addTwo).to.increase(getVal); // Not recommended
+ *
+ * When two arguments are provided, `.increase` asserts that the value of the
+ * given object `subject`'s `prop` property is greater after invoking the
+ * target function compared to beforehand.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.increase(myObj, 'val'); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.increase`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either decreases, or that it stays the same.
+ * It's often best to identify the exact output that's expected, and then
+ * write an assertion that only accepts that exact output.
+ *
+ * When the subject is expected to decrease, it's often best to assert that it
+ * decreased by the expected amount.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.not.increase(myObj, 'val'); // Not recommended
+ *
+ * When the subject is expected to stay the same, it's often best to assert
+ * exactly that.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'val'); // Recommended
+ * expect(noop).to.not.increase(myObj, 'val'); // Not recommended
+ *
+ * `.increase` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.increase(myObj, 'val', 'nooo why fail??');
+ *
+ * var val = 1
+ * , noop = function () {}
+ * , getVal = function () { return val; };
+ *
+ * expect(noop, 'nooo why fail??').to.increase(getVal);
+ *
+ * The alias `.increases` can be used interchangeably with `.increase`.
+ *
+ * @name increase
+ * @alias increases
+ * @param {String|Function} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertIncreases (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ // Make sure that the target is a number
+ new Assertion(initial, flagMsg, ssfi, true).is.a('number');
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'increase');
+ flag(this, 'realDelta', final - initial);
+
+ this.assert(
+ final - initial > 0
+ , 'expected ' + msgObj + ' to increase'
+ , 'expected ' + msgObj + ' to not increase'
+ );
+ }
+
+ Assertion.addMethod('increase', assertIncreases);
+ Assertion.addMethod('increases', assertIncreases);
+
+ /**
+ * ### .decrease(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.decrease` asserts that the given function
+ * `subject` returns a lesser number when it's invoked after invoking the
+ * target function compared to when it's invoked beforehand. `.decrease` also
+ * causes all `.by` assertions that follow in the chain to assert how much
+ * lesser of a number is returned. It's often best to assert that the return
+ * value decreased by the expected amount, rather than asserting it decreased
+ * by any amount.
+ *
+ * var val = 1
+ * , subtractTwo = function () { val -= 2; }
+ * , getVal = function () { return val; };
+ *
+ * expect(subtractTwo).to.decrease(getVal).by(2); // Recommended
+ * expect(subtractTwo).to.decrease(getVal); // Not recommended
+ *
+ * When two arguments are provided, `.decrease` asserts that the value of the
+ * given object `subject`'s `prop` property is lesser after invoking the
+ * target function compared to beforehand.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.decrease(myObj, 'val'); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.decrease`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either increases, or that it stays the same.
+ * It's often best to identify the exact output that's expected, and then
+ * write an assertion that only accepts that exact output.
+ *
+ * When the subject is expected to increase, it's often best to assert that it
+ * increased by the expected amount.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.not.decrease(myObj, 'val'); // Not recommended
+ *
+ * When the subject is expected to stay the same, it's often best to assert
+ * exactly that.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'val'); // Recommended
+ * expect(noop).to.not.decrease(myObj, 'val'); // Not recommended
+ *
+ * `.decrease` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.decrease(myObj, 'val', 'nooo why fail??');
+ *
+ * var val = 1
+ * , noop = function () {}
+ * , getVal = function () { return val; };
+ *
+ * expect(noop, 'nooo why fail??').to.decrease(getVal);
+ *
+ * The alias `.decreases` can be used interchangeably with `.decrease`.
+ *
+ * @name decrease
+ * @alias decreases
+ * @param {String|Function} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertDecreases (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ // Make sure that the target is a number
+ new Assertion(initial, flagMsg, ssfi, true).is.a('number');
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'decrease');
+ flag(this, 'realDelta', initial - final);
+
+ this.assert(
+ final - initial < 0
+ , 'expected ' + msgObj + ' to decrease'
+ , 'expected ' + msgObj + ' to not decrease'
+ );
+ }
+
+ Assertion.addMethod('decrease', assertDecreases);
+ Assertion.addMethod('decreases', assertDecreases);
+
+ /**
+ * ### .by(delta[, msg])
+ *
+ * When following an `.increase` assertion in the chain, `.by` asserts that
+ * the subject of the `.increase` assertion increased by the given `delta`.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2);
+ *
+ * When following a `.decrease` assertion in the chain, `.by` asserts that the
+ * subject of the `.decrease` assertion decreased by the given `delta`.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2);
+ *
+ * When following a `.change` assertion in the chain, `.by` asserts that the
+ * subject of the `.change` assertion either increased or decreased by the
+ * given `delta`. However, it's dangerous to use `.change.by`. The problem is
+ * that it creates uncertain expectations. It's often best to identify the
+ * exact output that's expected, and then write an assertion that only accepts
+ * that exact output.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; }
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.by`. However, it's often best
+ * to assert that the subject changed by its expected delta, rather than
+ * asserting that it didn't change by one of countless unexpected deltas.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * // Recommended
+ * expect(addTwo).to.increase(myObj, 'val').by(2);
+ *
+ * // Not recommended
+ * expect(addTwo).to.increase(myObj, 'val').but.not.by(3);
+ *
+ * `.by` accepts an optional `msg` argument which is a custom error message to
+ * show when the assertion fails. The message can also be given as the second
+ * argument to `expect`.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(3, 'nooo why fail??');
+ * expect(addTwo, 'nooo why fail??').to.increase(myObj, 'val').by(3);
+ *
+ * @name by
+ * @param {Number} delta
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertDelta(delta, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var msgObj = flag(this, 'deltaMsgObj');
+ var initial = flag(this, 'initialDeltaValue');
+ var final = flag(this, 'finalDeltaValue');
+ var behavior = flag(this, 'deltaBehavior');
+ var realDelta = flag(this, 'realDelta');
+
+ var expression;
+ if (behavior === 'change') {
+ expression = Math.abs(final - initial) === Math.abs(delta);
+ } else {
+ expression = realDelta === Math.abs(delta);
+ }
+
+ this.assert(
+ expression
+ , 'expected ' + msgObj + ' to ' + behavior + ' by ' + delta
+ , 'expected ' + msgObj + ' to not ' + behavior + ' by ' + delta
+ );
+ }
+
+ Assertion.addMethod('by', assertDelta);
+
+ /**
+ * ### .extensible
+ *
+ * Asserts that the target is extensible, which means that new properties can
+ * be added to it. Primitives are never extensible.
+ *
+ * expect({a: 1}).to.be.extensible;
+ *
+ * Add `.not` earlier in the chain to negate `.extensible`.
+ *
+ * var nonExtensibleObject = Object.preventExtensions({})
+ * , sealedObject = Object.seal({})
+ * , frozenObject = Object.freeze({});
+ *
+ * expect(nonExtensibleObject).to.not.be.extensible;
+ * expect(sealedObject).to.not.be.extensible;
+ * expect(frozenObject).to.not.be.extensible;
+ * expect(1).to.not.be.extensible;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(1, 'nooo why fail??').to.be.extensible;
+ *
+ * @name extensible
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('extensible', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a non-extensible ordinary object, simply return false.
+ // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isExtensible = obj === Object(obj) && Object.isExtensible(obj);
+
+ this.assert(
+ isExtensible
+ , 'expected #{this} to be extensible'
+ , 'expected #{this} to not be extensible'
+ );
+ });
+
+ /**
+ * ### .sealed
+ *
+ * Asserts that the target is sealed, which means that new properties can't be
+ * added to it, and its existing properties can't be reconfigured or deleted.
+ * However, it's possible that its existing properties can still be reassigned
+ * to different values. Primitives are always sealed.
+ *
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.freeze({});
+ *
+ * expect(sealedObject).to.be.sealed;
+ * expect(frozenObject).to.be.sealed;
+ * expect(1).to.be.sealed;
+ *
+ * Add `.not` earlier in the chain to negate `.sealed`.
+ *
+ * expect({a: 1}).to.not.be.sealed;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.be.sealed;
+ *
+ * @name sealed
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('sealed', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a sealed ordinary object, simply return true.
+ // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isSealed = obj === Object(obj) ? Object.isSealed(obj) : true;
+
+ this.assert(
+ isSealed
+ , 'expected #{this} to be sealed'
+ , 'expected #{this} to not be sealed'
+ );
+ });
+
+ /**
+ * ### .frozen
+ *
+ * Asserts that the target is frozen, which means that new properties can't be
+ * added to it, and its existing properties can't be reassigned to different
+ * values, reconfigured, or deleted. Primitives are always frozen.
+ *
+ * var frozenObject = Object.freeze({});
+ *
+ * expect(frozenObject).to.be.frozen;
+ * expect(1).to.be.frozen;
+ *
+ * Add `.not` earlier in the chain to negate `.frozen`.
+ *
+ * expect({a: 1}).to.not.be.frozen;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.be.frozen;
+ *
+ * @name frozen
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('frozen', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a frozen ordinary object, simply return true.
+ // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isFrozen = obj === Object(obj) ? Object.isFrozen(obj) : true;
+
+ this.assert(
+ isFrozen
+ , 'expected #{this} to be frozen'
+ , 'expected #{this} to not be frozen'
+ );
+ });
+
+ /**
+ * ### .finite
+ *
+ * Asserts that the target is a number, and isn't `NaN` or positive/negative
+ * `Infinity`.
+ *
+ * expect(1).to.be.finite;
+ *
+ * Add `.not` earlier in the chain to negate `.finite`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either isn't a number, or that it's `NaN`, or
+ * that it's positive `Infinity`, or that it's negative `Infinity`. It's often
+ * best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to be a number, it's often best to assert
+ * that it's the expected type, rather than asserting that it isn't one of
+ * many unexpected types.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be `NaN`, it's often best to assert exactly
+ * that.
+ *
+ * expect(NaN).to.be.NaN; // Recommended
+ * expect(NaN).to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be positive infinity, it's often best to
+ * assert exactly that.
+ *
+ * expect(Infinity).to.equal(Infinity); // Recommended
+ * expect(Infinity).to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be negative infinity, it's often best to
+ * assert exactly that.
+ *
+ * expect(-Infinity).to.equal(-Infinity); // Recommended
+ * expect(-Infinity).to.not.be.finite; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect('foo', 'nooo why fail??').to.be.finite;
+ *
+ * @name finite
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('finite', function(msg) {
+ var obj = flag(this, 'object');
+
+ this.assert(
+ typeof obj === 'number' && isFinite(obj)
+ , 'expected #{this} to be a finite number'
+ , 'expected #{this} to not be a finite number'
+ );
+ });
+};
+
+},{}],38:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ /*!
+ * Chai dependencies.
+ */
+
+ var Assertion = chai.Assertion
+ , flag = util.flag;
+
+ /*!
+ * Module export.
+ */
+
+ /**
+ * ### assert(expression, message)
+ *
+ * Write your own test expressions.
+ *
+ * assert('foo' !== 'bar', 'foo is not bar');
+ * assert(Array.isArray([]), 'empty arrays are arrays');
+ *
+ * @param {Mixed} expression to test for truthiness
+ * @param {String} message to display on error
+ * @name assert
+ * @namespace Assert
+ * @api public
+ */
+
+ var assert = chai.assert = function (express, errmsg) {
+ var test = new Assertion(null, null, chai.assert, true);
+ test.assert(
+ express
+ , errmsg
+ , '[ negation message unavailable ]'
+ );
+ };
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure. Node.js `assert` module-compatible.
+ *
+ * assert.fail();
+ * assert.fail("custom error message");
+ * assert.fail(1, 2);
+ * assert.fail(1, 2, "custom error message");
+ * assert.fail(1, 2, "custom error message", ">");
+ * assert.fail(1, 2, undefined, ">");
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ // Comply with Node's fail([message]) interface
+
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'assert.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, assert.fail);
+ };
+
+ /**
+ * ### .isOk(object, [message])
+ *
+ * Asserts that `object` is truthy.
+ *
+ * assert.isOk('everything', 'everything is ok');
+ * assert.isOk(false, 'this will fail');
+ *
+ * @name isOk
+ * @alias ok
+ * @param {Mixed} object to test
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isOk = function (val, msg) {
+ new Assertion(val, msg, assert.isOk, true).is.ok;
+ };
+
+ /**
+ * ### .isNotOk(object, [message])
+ *
+ * Asserts that `object` is falsy.
+ *
+ * assert.isNotOk('everything', 'this will fail');
+ * assert.isNotOk(false, 'this will pass');
+ *
+ * @name isNotOk
+ * @alias notOk
+ * @param {Mixed} object to test
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotOk = function (val, msg) {
+ new Assertion(val, msg, assert.isNotOk, true).is.not.ok;
+ };
+
+ /**
+ * ### .equal(actual, expected, [message])
+ *
+ * Asserts non-strict equality (`==`) of `actual` and `expected`.
+ *
+ * assert.equal(3, '3', '== coerces values to strings');
+ *
+ * @name equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.equal = function (act, exp, msg) {
+ var test = new Assertion(act, msg, assert.equal, true);
+
+ test.assert(
+ exp == flag(test, 'object')
+ , 'expected #{this} to equal #{exp}'
+ , 'expected #{this} to not equal #{act}'
+ , exp
+ , act
+ , true
+ );
+ };
+
+ /**
+ * ### .notEqual(actual, expected, [message])
+ *
+ * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
+ *
+ * assert.notEqual(3, 4, 'these numbers are not equal');
+ *
+ * @name notEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notEqual = function (act, exp, msg) {
+ var test = new Assertion(act, msg, assert.notEqual, true);
+
+ test.assert(
+ exp != flag(test, 'object')
+ , 'expected #{this} to not equal #{exp}'
+ , 'expected #{this} to equal #{act}'
+ , exp
+ , act
+ , true
+ );
+ };
+
+ /**
+ * ### .strictEqual(actual, expected, [message])
+ *
+ * Asserts strict equality (`===`) of `actual` and `expected`.
+ *
+ * assert.strictEqual(true, true, 'these booleans are strictly equal');
+ *
+ * @name strictEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.strictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.strictEqual, true).to.equal(exp);
+ };
+
+ /**
+ * ### .notStrictEqual(actual, expected, [message])
+ *
+ * Asserts strict inequality (`!==`) of `actual` and `expected`.
+ *
+ * assert.notStrictEqual(3, '3', 'no coercion for strict equality');
+ *
+ * @name notStrictEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notStrictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.notStrictEqual, true).to.not.equal(exp);
+ };
+
+ /**
+ * ### .deepEqual(actual, expected, [message])
+ *
+ * Asserts that `actual` is deeply equal to `expected`.
+ *
+ * assert.deepEqual({ tea: 'green' }, { tea: 'green' });
+ *
+ * @name deepEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @alias deepStrictEqual
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepEqual = assert.deepStrictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.deepEqual, true).to.eql(exp);
+ };
+
+ /**
+ * ### .notDeepEqual(actual, expected, [message])
+ *
+ * Assert that `actual` is not deeply equal to `expected`.
+ *
+ * assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
+ *
+ * @name notDeepEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.notDeepEqual, true).to.not.eql(exp);
+ };
+
+ /**
+ * ### .isAbove(valueToCheck, valueToBeAbove, [message])
+ *
+ * Asserts `valueToCheck` is strictly greater than (>) `valueToBeAbove`.
+ *
+ * assert.isAbove(5, 2, '5 is strictly greater than 2');
+ *
+ * @name isAbove
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAbove
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAbove = function (val, abv, msg) {
+ new Assertion(val, msg, assert.isAbove, true).to.be.above(abv);
+ };
+
+ /**
+ * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
+ *
+ * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`.
+ *
+ * assert.isAtLeast(5, 2, '5 is greater or equal to 2');
+ * assert.isAtLeast(3, 3, '3 is greater or equal to 3');
+ *
+ * @name isAtLeast
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAtLeast
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAtLeast = function (val, atlst, msg) {
+ new Assertion(val, msg, assert.isAtLeast, true).to.be.least(atlst);
+ };
+
+ /**
+ * ### .isBelow(valueToCheck, valueToBeBelow, [message])
+ *
+ * Asserts `valueToCheck` is strictly less than (<) `valueToBeBelow`.
+ *
+ * assert.isBelow(3, 6, '3 is strictly less than 6');
+ *
+ * @name isBelow
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeBelow
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isBelow = function (val, blw, msg) {
+ new Assertion(val, msg, assert.isBelow, true).to.be.below(blw);
+ };
+
+ /**
+ * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
+ *
+ * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`.
+ *
+ * assert.isAtMost(3, 6, '3 is less than or equal to 6');
+ * assert.isAtMost(4, 4, '4 is less than or equal to 4');
+ *
+ * @name isAtMost
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAtMost
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAtMost = function (val, atmst, msg) {
+ new Assertion(val, msg, assert.isAtMost, true).to.be.most(atmst);
+ };
+
+ /**
+ * ### .isTrue(value, [message])
+ *
+ * Asserts that `value` is true.
+ *
+ * var teaServed = true;
+ * assert.isTrue(teaServed, 'the tea has been served');
+ *
+ * @name isTrue
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isTrue = function (val, msg) {
+ new Assertion(val, msg, assert.isTrue, true).is['true'];
+ };
+
+ /**
+ * ### .isNotTrue(value, [message])
+ *
+ * Asserts that `value` is not true.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotTrue(tea, 'great, time for tea!');
+ *
+ * @name isNotTrue
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotTrue = function (val, msg) {
+ new Assertion(val, msg, assert.isNotTrue, true).to.not.equal(true);
+ };
+
+ /**
+ * ### .isFalse(value, [message])
+ *
+ * Asserts that `value` is false.
+ *
+ * var teaServed = false;
+ * assert.isFalse(teaServed, 'no tea yet? hmm...');
+ *
+ * @name isFalse
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFalse = function (val, msg) {
+ new Assertion(val, msg, assert.isFalse, true).is['false'];
+ };
+
+ /**
+ * ### .isNotFalse(value, [message])
+ *
+ * Asserts that `value` is not false.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotFalse(tea, 'great, time for tea!');
+ *
+ * @name isNotFalse
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFalse = function (val, msg) {
+ new Assertion(val, msg, assert.isNotFalse, true).to.not.equal(false);
+ };
+
+ /**
+ * ### .isNull(value, [message])
+ *
+ * Asserts that `value` is null.
+ *
+ * assert.isNull(err, 'there was no error');
+ *
+ * @name isNull
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNull = function (val, msg) {
+ new Assertion(val, msg, assert.isNull, true).to.equal(null);
+ };
+
+ /**
+ * ### .isNotNull(value, [message])
+ *
+ * Asserts that `value` is not null.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotNull(tea, 'great, time for tea!');
+ *
+ * @name isNotNull
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotNull = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNull, true).to.not.equal(null);
+ };
+
+ /**
+ * ### .isNaN
+ *
+ * Asserts that value is NaN.
+ *
+ * assert.isNaN(NaN, 'NaN is NaN');
+ *
+ * @name isNaN
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNaN = function (val, msg) {
+ new Assertion(val, msg, assert.isNaN, true).to.be.NaN;
+ };
+
+ /**
+ * ### .isNotNaN
+ *
+ * Asserts that value is not NaN.
+ *
+ * assert.isNotNaN(4, '4 is not NaN');
+ *
+ * @name isNotNaN
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+ assert.isNotNaN = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNaN, true).not.to.be.NaN;
+ };
+
+ /**
+ * ### .exists
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var foo = 'hi';
+ *
+ * assert.exists(foo, 'foo is neither `null` nor `undefined`');
+ *
+ * @name exists
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.exists = function (val, msg) {
+ new Assertion(val, msg, assert.exists, true).to.exist;
+ };
+
+ /**
+ * ### .notExists
+ *
+ * Asserts that the target is either `null` or `undefined`.
+ *
+ * var bar = null
+ * , baz;
+ *
+ * assert.notExists(bar);
+ * assert.notExists(baz, 'baz is either null or undefined');
+ *
+ * @name notExists
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notExists = function (val, msg) {
+ new Assertion(val, msg, assert.notExists, true).to.not.exist;
+ };
+
+ /**
+ * ### .isUndefined(value, [message])
+ *
+ * Asserts that `value` is `undefined`.
+ *
+ * var tea;
+ * assert.isUndefined(tea, 'no tea defined');
+ *
+ * @name isUndefined
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isUndefined = function (val, msg) {
+ new Assertion(val, msg, assert.isUndefined, true).to.equal(undefined);
+ };
+
+ /**
+ * ### .isDefined(value, [message])
+ *
+ * Asserts that `value` is not `undefined`.
+ *
+ * var tea = 'cup of chai';
+ * assert.isDefined(tea, 'tea has been defined');
+ *
+ * @name isDefined
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isDefined = function (val, msg) {
+ new Assertion(val, msg, assert.isDefined, true).to.not.equal(undefined);
+ };
+
+ /**
+ * ### .isFunction(value, [message])
+ *
+ * Asserts that `value` is a function.
+ *
+ * function serveTea() { return 'cup of tea'; };
+ * assert.isFunction(serveTea, 'great, we can have tea now');
+ *
+ * @name isFunction
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFunction = function (val, msg) {
+ new Assertion(val, msg, assert.isFunction, true).to.be.a('function');
+ };
+
+ /**
+ * ### .isNotFunction(value, [message])
+ *
+ * Asserts that `value` is _not_ a function.
+ *
+ * var serveTea = [ 'heat', 'pour', 'sip' ];
+ * assert.isNotFunction(serveTea, 'great, we have listed the steps');
+ *
+ * @name isNotFunction
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFunction = function (val, msg) {
+ new Assertion(val, msg, assert.isNotFunction, true).to.not.be.a('function');
+ };
+
+ /**
+ * ### .isObject(value, [message])
+ *
+ * Asserts that `value` is an object of type 'Object' (as revealed by `Object.prototype.toString`).
+ * _The assertion does not match subclassed objects._
+ *
+ * var selection = { name: 'Chai', serve: 'with spices' };
+ * assert.isObject(selection, 'tea selection is an object');
+ *
+ * @name isObject
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isObject = function (val, msg) {
+ new Assertion(val, msg, assert.isObject, true).to.be.a('object');
+ };
+
+ /**
+ * ### .isNotObject(value, [message])
+ *
+ * Asserts that `value` is _not_ an object of type 'Object' (as revealed by `Object.prototype.toString`).
+ *
+ * var selection = 'chai'
+ * assert.isNotObject(selection, 'tea selection is not an object');
+ * assert.isNotObject(null, 'null is not an object');
+ *
+ * @name isNotObject
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotObject = function (val, msg) {
+ new Assertion(val, msg, assert.isNotObject, true).to.not.be.a('object');
+ };
+
+ /**
+ * ### .isArray(value, [message])
+ *
+ * Asserts that `value` is an array.
+ *
+ * var menu = [ 'green', 'chai', 'oolong' ];
+ * assert.isArray(menu, 'what kind of tea do we want?');
+ *
+ * @name isArray
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isArray = function (val, msg) {
+ new Assertion(val, msg, assert.isArray, true).to.be.an('array');
+ };
+
+ /**
+ * ### .isNotArray(value, [message])
+ *
+ * Asserts that `value` is _not_ an array.
+ *
+ * var menu = 'green|chai|oolong';
+ * assert.isNotArray(menu, 'what kind of tea do we want?');
+ *
+ * @name isNotArray
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotArray = function (val, msg) {
+ new Assertion(val, msg, assert.isNotArray, true).to.not.be.an('array');
+ };
+
+ /**
+ * ### .isString(value, [message])
+ *
+ * Asserts that `value` is a string.
+ *
+ * var teaOrder = 'chai';
+ * assert.isString(teaOrder, 'order placed');
+ *
+ * @name isString
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isString = function (val, msg) {
+ new Assertion(val, msg, assert.isString, true).to.be.a('string');
+ };
+
+ /**
+ * ### .isNotString(value, [message])
+ *
+ * Asserts that `value` is _not_ a string.
+ *
+ * var teaOrder = 4;
+ * assert.isNotString(teaOrder, 'order placed');
+ *
+ * @name isNotString
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotString = function (val, msg) {
+ new Assertion(val, msg, assert.isNotString, true).to.not.be.a('string');
+ };
+
+ /**
+ * ### .isNumber(value, [message])
+ *
+ * Asserts that `value` is a number.
+ *
+ * var cups = 2;
+ * assert.isNumber(cups, 'how many cups');
+ *
+ * @name isNumber
+ * @param {Number} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNumber = function (val, msg) {
+ new Assertion(val, msg, assert.isNumber, true).to.be.a('number');
+ };
+
+ /**
+ * ### .isNotNumber(value, [message])
+ *
+ * Asserts that `value` is _not_ a number.
+ *
+ * var cups = '2 cups please';
+ * assert.isNotNumber(cups, 'how many cups');
+ *
+ * @name isNotNumber
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotNumber = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNumber, true).to.not.be.a('number');
+ };
+
+ /**
+ * ### .isFinite(value, [message])
+ *
+ * Asserts that `value` is a finite number. Unlike `.isNumber`, this will fail for `NaN` and `Infinity`.
+ *
+ * var cups = 2;
+ * assert.isFinite(cups, 'how many cups');
+ *
+ * assert.isFinite(NaN); // throws
+ *
+ * @name isFinite
+ * @param {Number} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFinite = function (val, msg) {
+ new Assertion(val, msg, assert.isFinite, true).to.be.finite;
+ };
+
+ /**
+ * ### .isBoolean(value, [message])
+ *
+ * Asserts that `value` is a boolean.
+ *
+ * var teaReady = true
+ * , teaServed = false;
+ *
+ * assert.isBoolean(teaReady, 'is the tea ready');
+ * assert.isBoolean(teaServed, 'has tea been served');
+ *
+ * @name isBoolean
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isBoolean = function (val, msg) {
+ new Assertion(val, msg, assert.isBoolean, true).to.be.a('boolean');
+ };
+
+ /**
+ * ### .isNotBoolean(value, [message])
+ *
+ * Asserts that `value` is _not_ a boolean.
+ *
+ * var teaReady = 'yep'
+ * , teaServed = 'nope';
+ *
+ * assert.isNotBoolean(teaReady, 'is the tea ready');
+ * assert.isNotBoolean(teaServed, 'has tea been served');
+ *
+ * @name isNotBoolean
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotBoolean = function (val, msg) {
+ new Assertion(val, msg, assert.isNotBoolean, true).to.not.be.a('boolean');
+ };
+
+ /**
+ * ### .typeOf(value, name, [message])
+ *
+ * Asserts that `value`'s type is `name`, as determined by
+ * `Object.prototype.toString`.
+ *
+ * assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
+ * assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
+ * assert.typeOf('tea', 'string', 'we have a string');
+ * assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
+ * assert.typeOf(null, 'null', 'we have a null');
+ * assert.typeOf(undefined, 'undefined', 'we have an undefined');
+ *
+ * @name typeOf
+ * @param {Mixed} value
+ * @param {String} name
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.typeOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.typeOf, true).to.be.a(type);
+ };
+
+ /**
+ * ### .notTypeOf(value, name, [message])
+ *
+ * Asserts that `value`'s type is _not_ `name`, as determined by
+ * `Object.prototype.toString`.
+ *
+ * assert.notTypeOf('tea', 'number', 'strings are not numbers');
+ *
+ * @name notTypeOf
+ * @param {Mixed} value
+ * @param {String} typeof name
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notTypeOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.notTypeOf, true).to.not.be.a(type);
+ };
+
+ /**
+ * ### .instanceOf(object, constructor, [message])
+ *
+ * Asserts that `value` is an instance of `constructor`.
+ *
+ * var Tea = function (name) { this.name = name; }
+ * , chai = new Tea('chai');
+ *
+ * assert.instanceOf(chai, Tea, 'chai is an instance of tea');
+ *
+ * @name instanceOf
+ * @param {Object} object
+ * @param {Constructor} constructor
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.instanceOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.instanceOf, true).to.be.instanceOf(type);
+ };
+
+ /**
+ * ### .notInstanceOf(object, constructor, [message])
+ *
+ * Asserts `value` is not an instance of `constructor`.
+ *
+ * var Tea = function (name) { this.name = name; }
+ * , chai = new String('chai');
+ *
+ * assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
+ *
+ * @name notInstanceOf
+ * @param {Object} object
+ * @param {Constructor} constructor
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notInstanceOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.notInstanceOf, true)
+ .to.not.be.instanceOf(type);
+ };
+
+ /**
+ * ### .include(haystack, needle, [message])
+ *
+ * Asserts that `haystack` includes `needle`. Can be used to assert the
+ * inclusion of a value in an array, a substring in a string, or a subset of
+ * properties in an object.
+ *
+ * assert.include([1,2,3], 2, 'array contains value');
+ * assert.include('foobar', 'foo', 'string contains substring');
+ * assert.include({ foo: 'bar', hello: 'universe' }, { foo: 'bar' }, 'object contains property');
+ *
+ * Strict equality (===) is used. When asserting the inclusion of a value in
+ * an array, the array is searched for an element that's strictly equal to the
+ * given value. When asserting a subset of properties in an object, the object
+ * is searched for the given property keys, checking that each one is present
+ * and strictly equal to the given property value. For instance:
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.include([obj1, obj2], obj1);
+ * assert.include({foo: obj1, bar: obj2}, {foo: obj1});
+ * assert.include({foo: obj1, bar: obj2}, {foo: obj1, bar: obj2});
+ *
+ * @name include
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.include = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.include, true).include(inc);
+ };
+
+ /**
+ * ### .notInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` does not include `needle`. Can be used to assert
+ * the absence of a value in an array, a substring in a string, or a subset of
+ * properties in an object.
+ *
+ * assert.notInclude([1,2,3], 4, "array doesn't contain value");
+ * assert.notInclude('foobar', 'baz', "string doesn't contain substring");
+ * assert.notInclude({ foo: 'bar', hello: 'universe' }, { foo: 'baz' }, 'object doesn't contain property');
+ *
+ * Strict equality (===) is used. When asserting the absence of a value in an
+ * array, the array is searched to confirm the absence of an element that's
+ * strictly equal to the given value. When asserting a subset of properties in
+ * an object, the object is searched to confirm that at least one of the given
+ * property keys is either not present or not strictly equal to the given
+ * property value. For instance:
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.notInclude([obj1, obj2], {a: 1});
+ * assert.notInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
+ * assert.notInclude({foo: obj1, bar: obj2}, {foo: obj1, bar: {b: 2}});
+ *
+ * @name notInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notInclude, true).not.include(inc);
+ };
+
+ /**
+ * ### .deepInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` includes `needle`. Can be used to assert the
+ * inclusion of a value in an array or a subset of properties in an object.
+ * Deep equality is used.
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.deepInclude([obj1, obj2], {a: 1});
+ * assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
+ * assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 2}});
+ *
+ * @name deepInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepInclude, true).deep.include(inc);
+ };
+
+ /**
+ * ### .notDeepInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` does not include `needle`. Can be used to assert
+ * the absence of a value in an array or a subset of properties in an object.
+ * Deep equality is used.
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.notDeepInclude([obj1, obj2], {a: 9});
+ * assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 9}});
+ * assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 9}});
+ *
+ * @name notDeepInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepInclude, true).not.deep.include(inc);
+ };
+
+ /**
+ * ### .nestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.nestedInclude({'.a': {'b': 'x'}}, {'\\.a.[b]': 'x'});
+ * assert.nestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'x'});
+ *
+ * @name nestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.nestedInclude, true).nested.include(inc);
+ };
+
+ /**
+ * ### .notNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' does not include 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.notNestedInclude({'.a': {'b': 'x'}}, {'\\.a.b': 'y'});
+ * assert.notNestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'y'});
+ *
+ * @name notNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notNestedInclude, true)
+ .not.nested.include(inc);
+ };
+
+ /**
+ * ### .deepNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while checking for deep equality.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.deepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {x: 1}});
+ * assert.deepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {x: 1}});
+ *
+ * @name deepNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepNestedInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepNestedInclude, true)
+ .deep.nested.include(inc);
+ };
+
+ /**
+ * ### .notDeepNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' does not include 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while checking for deep equality.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.notDeepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {y: 1}})
+ * assert.notDeepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {y: 2}});
+ *
+ * @name notDeepNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepNestedInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepNestedInclude, true)
+ .not.deep.nested.include(inc);
+ };
+
+ /**
+ * ### .ownInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while ignoring inherited properties.
+ *
+ * assert.ownInclude({ a: 1 }, { a: 1 });
+ *
+ * @name ownInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.ownInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.ownInclude, true).own.include(inc);
+ };
+
+ /**
+ * ### .notOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while ignoring inherited properties.
+ *
+ * Object.prototype.b = 2;
+ *
+ * assert.notOwnInclude({ a: 1 }, { b: 2 });
+ *
+ * @name notOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notOwnInclude, true).not.own.include(inc);
+ };
+
+ /**
+ * ### .deepOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while ignoring inherited properties and checking for deep equality.
+ *
+ * assert.deepOwnInclude({a: {b: 2}}, {a: {b: 2}});
+ *
+ * @name deepOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepOwnInclude, true)
+ .deep.own.include(inc);
+ };
+
+ /**
+ * ### .notDeepOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while ignoring inherited properties and checking for deep equality.
+ *
+ * assert.notDeepOwnInclude({a: {b: 2}}, {a: {c: 3}});
+ *
+ * @name notDeepOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepOwnInclude, true)
+ .not.deep.own.include(inc);
+ };
+
+ /**
+ * ### .match(value, regexp, [message])
+ *
+ * Asserts that `value` matches the regular expression `regexp`.
+ *
+ * assert.match('foobar', /^foo/, 'regexp matches');
+ *
+ * @name match
+ * @param {Mixed} value
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.match = function (exp, re, msg) {
+ new Assertion(exp, msg, assert.match, true).to.match(re);
+ };
+
+ /**
+ * ### .notMatch(value, regexp, [message])
+ *
+ * Asserts that `value` does not match the regular expression `regexp`.
+ *
+ * assert.notMatch('foobar', /^foo/, 'regexp does not match');
+ *
+ * @name notMatch
+ * @param {Mixed} value
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notMatch = function (exp, re, msg) {
+ new Assertion(exp, msg, assert.notMatch, true).to.not.match(re);
+ };
+
+ /**
+ * ### .property(object, property, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property`.
+ *
+ * assert.property({ tea: { green: 'matcha' }}, 'tea');
+ * assert.property({ tea: { green: 'matcha' }}, 'toString');
+ *
+ * @name property
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.property = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.property, true).to.have.property(prop);
+ };
+
+ /**
+ * ### .notProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property`.
+ *
+ * assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
+ *
+ * @name notProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notProperty, true)
+ .to.not.have.property(prop);
+ };
+
+ /**
+ * ### .propertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property` with a value given by `value`. Uses a strict equality check
+ * (===).
+ *
+ * assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
+ *
+ * @name propertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.propertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.propertyVal, true)
+ .to.have.property(prop, val);
+ };
+
+ /**
+ * ### .notPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property` with value given by `value`. Uses a strict equality check
+ * (===).
+ *
+ * assert.notPropertyVal({ tea: 'is good' }, 'tea', 'is bad');
+ * assert.notPropertyVal({ tea: 'is good' }, 'coffee', 'is good');
+ *
+ * @name notPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notPropertyVal, true)
+ .to.not.have.property(prop, val);
+ };
+
+ /**
+ * ### .deepPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property` with a value given by `value`. Uses a deep equality check.
+ *
+ * assert.deepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
+ *
+ * @name deepPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.deepPropertyVal, true)
+ .to.have.deep.property(prop, val);
+ };
+
+ /**
+ * ### .notDeepPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property` with value given by `value`. Uses a deep equality check.
+ *
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
+ *
+ * @name notDeepPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notDeepPropertyVal, true)
+ .to.not.have.deep.property(prop, val);
+ };
+
+ /**
+ * ### .ownProperty(object, property, [message])
+ *
+ * Asserts that `object` has a direct property named by `property`. Inherited
+ * properties aren't checked.
+ *
+ * assert.ownProperty({ tea: { green: 'matcha' }}, 'tea');
+ *
+ * @name ownProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @api public
+ */
+
+ assert.ownProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.ownProperty, true)
+ .to.have.own.property(prop);
+ };
+
+ /**
+ * ### .notOwnProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by
+ * `property`. Inherited properties aren't checked.
+ *
+ * assert.notOwnProperty({ tea: { green: 'matcha' }}, 'coffee');
+ * assert.notOwnProperty({}, 'toString');
+ *
+ * @name notOwnProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notOwnProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notOwnProperty, true)
+ .to.not.have.own.property(prop);
+ };
+
+ /**
+ * ### .ownPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct property named by `property` and a value
+ * equal to the provided `value`. Uses a strict equality check (===).
+ * Inherited properties aren't checked.
+ *
+ * assert.ownPropertyVal({ coffee: 'is good'}, 'coffee', 'is good');
+ *
+ * @name ownPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.ownPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.ownPropertyVal, true)
+ .to.have.own.property(prop, value);
+ };
+
+ /**
+ * ### .notOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by `property`
+ * with a value equal to the provided `value`. Uses a strict equality check
+ * (===). Inherited properties aren't checked.
+ *
+ * assert.notOwnPropertyVal({ tea: 'is better'}, 'tea', 'is worse');
+ * assert.notOwnPropertyVal({}, 'toString', Object.prototype.toString);
+ *
+ * @name notOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.notOwnPropertyVal, true)
+ .to.not.have.own.property(prop, value);
+ };
+
+ /**
+ * ### .deepOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct property named by `property` and a value
+ * equal to the provided `value`. Uses a deep equality check. Inherited
+ * properties aren't checked.
+ *
+ * assert.deepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
+ *
+ * @name deepOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.deepOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.deepOwnPropertyVal, true)
+ .to.have.deep.own.property(prop, value);
+ };
+
+ /**
+ * ### .notDeepOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by `property`
+ * with a value equal to the provided `value`. Uses a deep equality check.
+ * Inherited properties aren't checked.
+ *
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
+ * assert.notDeepOwnPropertyVal({}, 'toString', Object.prototype.toString);
+ *
+ * @name notDeepOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notDeepOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.notDeepOwnPropertyVal, true)
+ .to.not.have.deep.own.property(prop, value);
+ };
+
+ /**
+ * ### .nestedProperty(object, property, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property`, which can be a string using dot- and bracket-notation for
+ * nested reference.
+ *
+ * assert.nestedProperty({ tea: { green: 'matcha' }}, 'tea.green');
+ *
+ * @name nestedProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.nestedProperty, true)
+ .to.have.nested.property(prop);
+ };
+
+ /**
+ * ### .notNestedProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property`, which
+ * can be a string using dot- and bracket-notation for nested reference. The
+ * property cannot exist on the object nor anywhere in its prototype chain.
+ *
+ * assert.notNestedProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
+ *
+ * @name notNestedProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notNestedProperty, true)
+ .to.not.have.nested.property(prop);
+ };
+
+ /**
+ * ### .nestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a property named by `property` with value given
+ * by `value`. `property` can use dot- and bracket-notation for nested
+ * reference. Uses a strict equality check (===).
+ *
+ * assert.nestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
+ *
+ * @name nestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.nestedPropertyVal, true)
+ .to.have.nested.property(prop, val);
+ };
+
+ /**
+ * ### .notNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property` with
+ * value given by `value`. `property` can use dot- and bracket-notation for
+ * nested reference. Uses a strict equality check (===).
+ *
+ * assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
+ * assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'coffee.green', 'matcha');
+ *
+ * @name notNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notNestedPropertyVal, true)
+ .to.not.have.nested.property(prop, val);
+ };
+
+ /**
+ * ### .deepNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a property named by `property` with a value given
+ * by `value`. `property` can use dot- and bracket-notation for nested
+ * reference. Uses a deep equality check.
+ *
+ * assert.deepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yum' });
+ *
+ * @name deepNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.deepNestedPropertyVal, true)
+ .to.have.deep.nested.property(prop, val);
+ };
+
+ /**
+ * ### .notDeepNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property` with
+ * value given by `value`. `property` can use dot- and bracket-notation for
+ * nested reference. Uses a deep equality check.
+ *
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { oolong: 'yum' });
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yuck' });
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.black', { matcha: 'yum' });
+ *
+ * @name notDeepNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notDeepNestedPropertyVal, true)
+ .to.not.have.deep.nested.property(prop, val);
+ }
+
+ /**
+ * ### .lengthOf(object, length, [message])
+ *
+ * Asserts that `object` has a `length` or `size` with the expected value.
+ *
+ * assert.lengthOf([1,2,3], 3, 'array has length of 3');
+ * assert.lengthOf('foobar', 6, 'string has length of 6');
+ * assert.lengthOf(new Set([1,2,3]), 3, 'set has size of 3');
+ * assert.lengthOf(new Map([['a',1],['b',2],['c',3]]), 3, 'map has size of 3');
+ *
+ * @name lengthOf
+ * @param {Mixed} object
+ * @param {Number} length
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.lengthOf = function (exp, len, msg) {
+ new Assertion(exp, msg, assert.lengthOf, true).to.have.lengthOf(len);
+ };
+
+ /**
+ * ### .hasAnyKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has at least one of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'iDontExist', 'baz']);
+ * assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, iDontExist: 99, baz: 1337});
+ * assert.hasAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.hasAnyKeys(new Set([{foo: 'bar'}, 'anotherKey']), [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name hasAnyKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAnyKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAnyKeys, true).to.have.any.keys(keys);
+ }
+
+ /**
+ * ### .hasAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all and only all of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
+ * assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337]);
+ * assert.hasAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.hasAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name hasAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAllKeys, true).to.have.all.keys(keys);
+ }
+
+ /**
+ * ### .containsAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all of the `keys` provided but may have more keys not listed.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'baz']);
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, baz: 1337});
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337});
+ * assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}]);
+ * assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}]);
+ * assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name containsAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.containsAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.containsAllKeys, true)
+ .to.contain.all.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAnyKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has none of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
+ * assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
+ * assert.doesNotHaveAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
+ * assert.doesNotHaveAnyKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
+ *
+ * @name doesNotHaveAnyKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAnyKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAnyKeys, true)
+ .to.not.have.any.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` does not have at least one of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
+ * assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
+ * assert.doesNotHaveAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
+ * assert.doesNotHaveAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
+ *
+ * @name doesNotHaveAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAllKeys, true)
+ .to.not.have.all.keys(keys);
+ }
+
+ /**
+ * ### .hasAnyDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has at least one of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {three: 'three'}]);
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name doesNotHaveAllKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAnyDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAnyDeepKeys, true)
+ .to.have.any.deep.keys(keys);
+ }
+
+ /**
+ * ### .hasAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all and only all of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne']]), {one: 'one'});
+ * assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAllDeepKeys(new Set([{one: 'one'}]), {one: 'one'});
+ * assert.hasAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name hasAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAllDeepKeys, true)
+ .to.have.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .containsAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` contains all of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
+ * assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
+ * assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name containsAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.containsAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.containsAllDeepKeys, true)
+ .to.contain.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAnyDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has none of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
+ * assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
+ * assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
+ * assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
+ *
+ * @name doesNotHaveAnyDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAnyDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAnyDeepKeys, true)
+ .to.not.have.any.deep.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` does not have at least one of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
+ * assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {one: 'one'}]);
+ * assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
+ * assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {fifty: 'fifty'}]);
+ *
+ * @name doesNotHaveAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAllDeepKeys, true)
+ .to.not.have.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .throws(fn, [errorLike/string/regexp], [string/regexp], [message])
+ *
+ * If `errorLike` is an `Error` constructor, asserts that `fn` will throw an error that is an
+ * instance of `errorLike`.
+ * If `errorLike` is an `Error` instance, asserts that the error thrown is the same
+ * instance as `errorLike`.
+ * If `errMsgMatcher` is provided, it also asserts that the error thrown will have a
+ * message matching `errMsgMatcher`.
+ *
+ * assert.throws(fn, 'Error thrown must have this msg');
+ * assert.throws(fn, /Error thrown must have a msg that matches this/);
+ * assert.throws(fn, ReferenceError);
+ * assert.throws(fn, errorInstance);
+ * assert.throws(fn, ReferenceError, 'Error thrown must be a ReferenceError and have this msg');
+ * assert.throws(fn, errorInstance, 'Error thrown must be the same errorInstance and have this msg');
+ * assert.throws(fn, ReferenceError, /Error thrown must be a ReferenceError and match this/);
+ * assert.throws(fn, errorInstance, /Error thrown must be the same errorInstance and match this/);
+ *
+ * @name throws
+ * @alias throw
+ * @alias Throw
+ * @param {Function} fn
+ * @param {ErrorConstructor|Error} errorLike
+ * @param {RegExp|String} errMsgMatcher
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.throws = function (fn, errorLike, errMsgMatcher, msg) {
+ if ('string' === typeof errorLike || errorLike instanceof RegExp) {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ var assertErr = new Assertion(fn, msg, assert.throws, true)
+ .to.throw(errorLike, errMsgMatcher);
+ return flag(assertErr, 'object');
+ };
+
+ /**
+ * ### .doesNotThrow(fn, [errorLike/string/regexp], [string/regexp], [message])
+ *
+ * If `errorLike` is an `Error` constructor, asserts that `fn` will _not_ throw an error that is an
+ * instance of `errorLike`.
+ * If `errorLike` is an `Error` instance, asserts that the error thrown is _not_ the same
+ * instance as `errorLike`.
+ * If `errMsgMatcher` is provided, it also asserts that the error thrown will _not_ have a
+ * message matching `errMsgMatcher`.
+ *
+ * assert.doesNotThrow(fn, 'Any Error thrown must not have this message');
+ * assert.doesNotThrow(fn, /Any Error thrown must not match this/);
+ * assert.doesNotThrow(fn, Error);
+ * assert.doesNotThrow(fn, errorInstance);
+ * assert.doesNotThrow(fn, Error, 'Error must not have this message');
+ * assert.doesNotThrow(fn, errorInstance, 'Error must not have this message');
+ * assert.doesNotThrow(fn, Error, /Error must not match this/);
+ * assert.doesNotThrow(fn, errorInstance, /Error must not match this/);
+ *
+ * @name doesNotThrow
+ * @param {Function} fn
+ * @param {ErrorConstructor} errorLike
+ * @param {RegExp|String} errMsgMatcher
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotThrow = function (fn, errorLike, errMsgMatcher, msg) {
+ if ('string' === typeof errorLike || errorLike instanceof RegExp) {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ new Assertion(fn, msg, assert.doesNotThrow, true)
+ .to.not.throw(errorLike, errMsgMatcher);
+ };
+
+ /**
+ * ### .operator(val1, operator, val2, [message])
+ *
+ * Compares two values using `operator`.
+ *
+ * assert.operator(1, '<', 2, 'everything is ok');
+ * assert.operator(1, '>', 2, 'this will fail');
+ *
+ * @name operator
+ * @param {Mixed} val1
+ * @param {String} operator
+ * @param {Mixed} val2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.operator = function (val, operator, val2, msg) {
+ var ok;
+ switch(operator) {
+ case '==':
+ ok = val == val2;
+ break;
+ case '===':
+ ok = val === val2;
+ break;
+ case '>':
+ ok = val > val2;
+ break;
+ case '>=':
+ ok = val >= val2;
+ break;
+ case '<':
+ ok = val < val2;
+ break;
+ case '<=':
+ ok = val <= val2;
+ break;
+ case '!=':
+ ok = val != val2;
+ break;
+ case '!==':
+ ok = val !== val2;
+ break;
+ default:
+ msg = msg ? msg + ': ' : msg;
+ throw new chai.AssertionError(
+ msg + 'Invalid operator "' + operator + '"',
+ undefined,
+ assert.operator
+ );
+ }
+ var test = new Assertion(ok, msg, assert.operator, true);
+ test.assert(
+ true === flag(test, 'object')
+ , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
+ , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
+ };
+
+ /**
+ * ### .closeTo(actual, expected, delta, [message])
+ *
+ * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+ *
+ * assert.closeTo(1.5, 1, 0.5, 'numbers are close');
+ *
+ * @name closeTo
+ * @param {Number} actual
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.closeTo = function (act, exp, delta, msg) {
+ new Assertion(act, msg, assert.closeTo, true).to.be.closeTo(exp, delta);
+ };
+
+ /**
+ * ### .approximately(actual, expected, delta, [message])
+ *
+ * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+ *
+ * assert.approximately(1.5, 1, 0.5, 'numbers are close');
+ *
+ * @name approximately
+ * @param {Number} actual
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.approximately = function (act, exp, delta, msg) {
+ new Assertion(act, msg, assert.approximately, true)
+ .to.be.approximately(exp, delta);
+ };
+
+ /**
+ * ### .sameMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in any order. Uses a
+ * strict equality check (===).
+ *
+ * assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
+ *
+ * @name sameMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameMembers, true)
+ .to.have.same.members(set2);
+ }
+
+ /**
+ * ### .notSameMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in any order.
+ * Uses a strict equality check (===).
+ *
+ * assert.notSameMembers([ 1, 2, 3 ], [ 5, 1, 3 ], 'not same members');
+ *
+ * @name notSameMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameMembers, true)
+ .to.not.have.same.members(set2);
+ }
+
+ /**
+ * ### .sameDeepMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in any order. Uses a
+ * deep equality check.
+ *
+ * assert.sameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { c: 3 }], 'same deep members');
+ *
+ * @name sameDeepMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameDeepMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameDeepMembers, true)
+ .to.have.same.deep.members(set2);
+ }
+
+ /**
+ * ### .notSameDeepMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in any order.
+ * Uses a deep equality check.
+ *
+ * assert.notSameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { f: 5 }], 'not same deep members');
+ *
+ * @name notSameDeepMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameDeepMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameDeepMembers, true)
+ .to.not.have.same.deep.members(set2);
+ }
+
+ /**
+ * ### .sameOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in the same order.
+ * Uses a strict equality check (===).
+ *
+ * assert.sameOrderedMembers([ 1, 2, 3 ], [ 1, 2, 3 ], 'same ordered members');
+ *
+ * @name sameOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameOrderedMembers, true)
+ .to.have.same.ordered.members(set2);
+ }
+
+ /**
+ * ### .notSameOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in the same
+ * order. Uses a strict equality check (===).
+ *
+ * assert.notSameOrderedMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'not same ordered members');
+ *
+ * @name notSameOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameOrderedMembers, true)
+ .to.not.have.same.ordered.members(set2);
+ }
+
+ /**
+ * ### .sameDeepOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in the same order.
+ * Uses a deep equality check.
+ *
+ * assert.sameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { c: 3 } ], 'same deep ordered members');
+ *
+ * @name sameDeepOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameDeepOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameDeepOrderedMembers, true)
+ .to.have.same.deep.ordered.members(set2);
+ }
+
+ /**
+ * ### .notSameDeepOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in the same
+ * order. Uses a deep equality check.
+ *
+ * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { z: 5 } ], 'not same deep ordered members');
+ * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { c: 3 } ], 'not same deep ordered members');
+ *
+ * @name notSameDeepOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameDeepOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameDeepOrderedMembers, true)
+ .to.not.have.same.deep.ordered.members(set2);
+ }
+
+ /**
+ * ### .includeMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in any order. Uses a
+ * strict equality check (===). Duplicates are ignored.
+ *
+ * assert.includeMembers([ 1, 2, 3 ], [ 2, 1, 2 ], 'include members');
+ *
+ * @name includeMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeMembers, true)
+ .to.include.members(subset);
+ }
+
+ /**
+ * ### .notIncludeMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in any order. Uses a
+ * strict equality check (===). Duplicates are ignored.
+ *
+ * assert.notIncludeMembers([ 1, 2, 3 ], [ 5, 1 ], 'not include members');
+ *
+ * @name notIncludeMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeMembers, true)
+ .to.not.include.members(subset);
+ }
+
+ /**
+ * ### .includeDeepMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in any order. Uses a deep
+ * equality check. Duplicates are ignored.
+ *
+ * assert.includeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { b: 2 } ], 'include deep members');
+ *
+ * @name includeDeepMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeDeepMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeDeepMembers, true)
+ .to.include.deep.members(subset);
+ }
+
+ /**
+ * ### .notIncludeDeepMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in any order. Uses a
+ * deep equality check. Duplicates are ignored.
+ *
+ * assert.notIncludeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { f: 5 } ], 'not include deep members');
+ *
+ * @name notIncludeDeepMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeDeepMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeDeepMembers, true)
+ .to.not.include.deep.members(subset);
+ }
+
+ /**
+ * ### .includeOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a strict equality
+ * check (===).
+ *
+ * assert.includeOrderedMembers([ 1, 2, 3 ], [ 1, 2 ], 'include ordered members');
+ *
+ * @name includeOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeOrderedMembers, true)
+ .to.include.ordered.members(subset);
+ }
+
+ /**
+ * ### .notIncludeOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a strict equality
+ * check (===).
+ *
+ * assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 1 ], 'not include ordered members');
+ * assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 3 ], 'not include ordered members');
+ *
+ * @name notIncludeOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeOrderedMembers, true)
+ .to.not.include.ordered.members(subset);
+ }
+
+ /**
+ * ### .includeDeepOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a deep equality
+ * check.
+ *
+ * assert.includeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 } ], 'include deep ordered members');
+ *
+ * @name includeDeepOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeDeepOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeDeepOrderedMembers, true)
+ .to.include.deep.ordered.members(subset);
+ }
+
+ /**
+ * ### .notIncludeDeepOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a deep equality
+ * check.
+ *
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { f: 5 } ], 'not include deep ordered members');
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 } ], 'not include deep ordered members');
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { c: 3 } ], 'not include deep ordered members');
+ *
+ * @name notIncludeDeepOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeDeepOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeDeepOrderedMembers, true)
+ .to.not.include.deep.ordered.members(subset);
+ }
+
+ /**
+ * ### .oneOf(inList, list, [message])
+ *
+ * Asserts that non-object, non-array value `inList` appears in the flat array `list`.
+ *
+ * assert.oneOf(1, [ 2, 1 ], 'Not found in list');
+ *
+ * @name oneOf
+ * @param {*} inList
+ * @param {Array<*>} list
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.oneOf = function (inList, list, msg) {
+ new Assertion(inList, msg, assert.oneOf, true).to.be.oneOf(list);
+ }
+
+ /**
+ * ### .changes(function, object, property, [message])
+ *
+ * Asserts that a function changes the value of a property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 22 };
+ * assert.changes(fn, obj, 'val');
+ *
+ * @name changes
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changes = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changes, true).to.change(obj, prop);
+ }
+
+ /**
+ * ### .changesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function changes the value of a property by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 2 };
+ * assert.changesBy(fn, obj, 'val', 2);
+ *
+ * @name changesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changesBy, true)
+ .to.change(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotChange(function, object, property, [message])
+ *
+ * Asserts that a function does not change the value of a property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { console.log('foo'); };
+ * assert.doesNotChange(fn, obj, 'val');
+ *
+ * @name doesNotChange
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotChange = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotChange, true)
+ .to.not.change(obj, prop);
+ }
+
+ /**
+ * ### .changesButNotBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not change the value of a property or of a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 10 };
+ * assert.changesButNotBy(fn, obj, 'val', 5);
+ *
+ * @name changesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changesButNotBy, true)
+ .to.change(obj, prop).but.not.by(delta);
+ }
+
+ /**
+ * ### .increases(function, object, property, [message])
+ *
+ * Asserts that a function increases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 13 };
+ * assert.increases(fn, obj, 'val');
+ *
+ * @name increases
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increases = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.increases, true)
+ .to.increase(obj, prop);
+ }
+
+ /**
+ * ### .increasesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function increases a numeric object property or a function's return value by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 10 };
+ * assert.increasesBy(fn, obj, 'val', 10);
+ *
+ * @name increasesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increasesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.increasesBy, true)
+ .to.increase(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotIncrease(function, object, property, [message])
+ *
+ * Asserts that a function does not increase a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 8 };
+ * assert.doesNotIncrease(fn, obj, 'val');
+ *
+ * @name doesNotIncrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotIncrease = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotIncrease, true)
+ .to.not.increase(obj, prop);
+ }
+
+ /**
+ * ### .increasesButNotBy(function, object, property, [message])
+ *
+ * Asserts that a function does not increase a numeric object property or function's return value by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 15 };
+ * assert.increasesButNotBy(fn, obj, 'val', 10);
+ *
+ * @name increasesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increasesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.increasesButNotBy, true)
+ .to.increase(obj, prop).but.not.by(delta);
+ }
+
+ /**
+ * ### .decreases(function, object, property, [message])
+ *
+ * Asserts that a function decreases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.decreases(fn, obj, 'val');
+ *
+ * @name decreases
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreases = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.decreases, true)
+ .to.decrease(obj, prop);
+ }
+
+ /**
+ * ### .decreasesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val -= 5 };
+ * assert.decreasesBy(fn, obj, 'val', 5);
+ *
+ * @name decreasesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreasesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.decreasesBy, true)
+ .to.decrease(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotDecrease(function, object, property, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 15 };
+ * assert.doesNotDecrease(fn, obj, 'val');
+ *
+ * @name doesNotDecrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotDecrease = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotDecrease, true)
+ .to.not.decrease(obj, prop);
+ }
+
+ /**
+ * ### .doesNotDecreaseBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.doesNotDecreaseBy(fn, obj, 'val', 1);
+ *
+ * @name doesNotDecrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotDecreaseBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotDecreaseBy, true)
+ .to.not.decrease(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .decreasesButNotBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.decreasesButNotBy(fn, obj, 'val', 1);
+ *
+ * @name decreasesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreasesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.decreasesButNotBy, true)
+ .to.decrease(obj, prop).but.not.by(delta);
+ }
+
+ /*!
+ * ### .ifError(object)
+ *
+ * Asserts if value is not a false value, and throws if it is a true value.
+ * This is added to allow for chai to be a drop-in replacement for Node's
+ * assert class.
+ *
+ * var err = new Error('I am a custom error');
+ * assert.ifError(err); // Rethrows err!
+ *
+ * @name ifError
+ * @param {Object} object
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.ifError = function (val) {
+ if (val) {
+ throw(val);
+ }
+ };
+
+ /**
+ * ### .isExtensible(object)
+ *
+ * Asserts that `object` is extensible (can have new properties added to it).
+ *
+ * assert.isExtensible({});
+ *
+ * @name isExtensible
+ * @alias extensible
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isExtensible = function (obj, msg) {
+ new Assertion(obj, msg, assert.isExtensible, true).to.be.extensible;
+ };
+
+ /**
+ * ### .isNotExtensible(object)
+ *
+ * Asserts that `object` is _not_ extensible.
+ *
+ * var nonExtensibleObject = Object.preventExtensions({});
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.freeze({});
+ *
+ * assert.isNotExtensible(nonExtensibleObject);
+ * assert.isNotExtensible(sealedObject);
+ * assert.isNotExtensible(frozenObject);
+ *
+ * @name isNotExtensible
+ * @alias notExtensible
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotExtensible = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotExtensible, true).to.not.be.extensible;
+ };
+
+ /**
+ * ### .isSealed(object)
+ *
+ * Asserts that `object` is sealed (cannot have new properties added to it
+ * and its existing properties cannot be removed).
+ *
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.seal({});
+ *
+ * assert.isSealed(sealedObject);
+ * assert.isSealed(frozenObject);
+ *
+ * @name isSealed
+ * @alias sealed
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isSealed = function (obj, msg) {
+ new Assertion(obj, msg, assert.isSealed, true).to.be.sealed;
+ };
+
+ /**
+ * ### .isNotSealed(object)
+ *
+ * Asserts that `object` is _not_ sealed.
+ *
+ * assert.isNotSealed({});
+ *
+ * @name isNotSealed
+ * @alias notSealed
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotSealed = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotSealed, true).to.not.be.sealed;
+ };
+
+ /**
+ * ### .isFrozen(object)
+ *
+ * Asserts that `object` is frozen (cannot have new properties added to it
+ * and its existing properties cannot be modified).
+ *
+ * var frozenObject = Object.freeze({});
+ * assert.frozen(frozenObject);
+ *
+ * @name isFrozen
+ * @alias frozen
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFrozen = function (obj, msg) {
+ new Assertion(obj, msg, assert.isFrozen, true).to.be.frozen;
+ };
+
+ /**
+ * ### .isNotFrozen(object)
+ *
+ * Asserts that `object` is _not_ frozen.
+ *
+ * assert.isNotFrozen({});
+ *
+ * @name isNotFrozen
+ * @alias notFrozen
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFrozen = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotFrozen, true).to.not.be.frozen;
+ };
+
+ /**
+ * ### .isEmpty(target)
+ *
+ * Asserts that the target does not contain any values.
+ * For arrays and strings, it checks the `length` property.
+ * For `Map` and `Set` instances, it checks the `size` property.
+ * For non-function objects, it gets the count of own
+ * enumerable string keys.
+ *
+ * assert.isEmpty([]);
+ * assert.isEmpty('');
+ * assert.isEmpty(new Map);
+ * assert.isEmpty({});
+ *
+ * @name isEmpty
+ * @alias empty
+ * @param {Object|Array|String|Map|Set} target
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isEmpty = function(val, msg) {
+ new Assertion(val, msg, assert.isEmpty, true).to.be.empty;
+ };
+
+ /**
+ * ### .isNotEmpty(target)
+ *
+ * Asserts that the target contains values.
+ * For arrays and strings, it checks the `length` property.
+ * For `Map` and `Set` instances, it checks the `size` property.
+ * For non-function objects, it gets the count of own
+ * enumerable string keys.
+ *
+ * assert.isNotEmpty([1, 2]);
+ * assert.isNotEmpty('34');
+ * assert.isNotEmpty(new Set([5, 6]));
+ * assert.isNotEmpty({ key: 7 });
+ *
+ * @name isNotEmpty
+ * @alias notEmpty
+ * @param {Object|Array|String|Map|Set} target
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotEmpty = function(val, msg) {
+ new Assertion(val, msg, assert.isNotEmpty, true).to.not.be.empty;
+ };
+
+ /*!
+ * Aliases.
+ */
+
+ (function alias(name, as){
+ assert[as] = assert[name];
+ return alias;
+ })
+ ('isOk', 'ok')
+ ('isNotOk', 'notOk')
+ ('throws', 'throw')
+ ('throws', 'Throw')
+ ('isExtensible', 'extensible')
+ ('isNotExtensible', 'notExtensible')
+ ('isSealed', 'sealed')
+ ('isNotSealed', 'notSealed')
+ ('isFrozen', 'frozen')
+ ('isNotFrozen', 'notFrozen')
+ ('isEmpty', 'empty')
+ ('isNotEmpty', 'notEmpty');
+};
+
+},{}],39:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ chai.expect = function (val, message) {
+ return new chai.Assertion(val, message);
+ };
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure.
+ *
+ * expect.fail();
+ * expect.fail("custom error message");
+ * expect.fail(1, 2);
+ * expect.fail(1, 2, "custom error message");
+ * expect.fail(1, 2, "custom error message", ">");
+ * expect.fail(1, 2, undefined, ">");
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace BDD
+ * @api public
+ */
+
+ chai.expect.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'expect.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, chai.expect.fail);
+ };
+};
+
+},{}],40:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ var Assertion = chai.Assertion;
+
+ function loadShould () {
+ // explicitly define this method as function as to have it's name to include as `ssfi`
+ function shouldGetter() {
+ if (this instanceof String
+ || this instanceof Number
+ || this instanceof Boolean
+ || typeof Symbol === 'function' && this instanceof Symbol) {
+ return new Assertion(this.valueOf(), null, shouldGetter);
+ }
+ return new Assertion(this, null, shouldGetter);
+ }
+ function shouldSetter(value) {
+ // See https://github.com/chaijs/chai/issues/86: this makes
+ // `whatever.should = someValue` actually set `someValue`, which is
+ // especially useful for `global.should = require('chai').should()`.
+ //
+ // Note that we have to use [[DefineProperty]] instead of [[Put]]
+ // since otherwise we would trigger this very setter!
+ Object.defineProperty(this, 'should', {
+ value: value,
+ enumerable: true,
+ configurable: true,
+ writable: true
+ });
+ }
+ // modify Object.prototype to have `should`
+ Object.defineProperty(Object.prototype, 'should', {
+ set: shouldSetter
+ , get: shouldGetter
+ , configurable: true
+ });
+
+ var should = {};
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure.
+ *
+ * should.fail();
+ * should.fail("custom error message");
+ * should.fail(1, 2);
+ * should.fail(1, 2, "custom error message");
+ * should.fail(1, 2, "custom error message", ">");
+ * should.fail(1, 2, undefined, ">");
+ *
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace BDD
+ * @api public
+ */
+
+ should.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'should.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, should.fail);
+ };
+
+ /**
+ * ### .equal(actual, expected, [message])
+ *
+ * Asserts non-strict equality (`==`) of `actual` and `expected`.
+ *
+ * should.equal(3, '3', '== coerces values to strings');
+ *
+ * @name equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Should
+ * @api public
+ */
+
+ should.equal = function (val1, val2, msg) {
+ new Assertion(val1, msg).to.equal(val2);
+ };
+
+ /**
+ * ### .throw(function, [constructor/string/regexp], [string/regexp], [message])
+ *
+ * Asserts that `function` will throw an error that is an instance of
+ * `constructor`, or alternately that it will throw an error with message
+ * matching `regexp`.
+ *
+ * should.throw(fn, 'function throws a reference error');
+ * should.throw(fn, /function throws a reference error/);
+ * should.throw(fn, ReferenceError);
+ * should.throw(fn, ReferenceError, 'function throws a reference error');
+ * should.throw(fn, ReferenceError, /function throws a reference error/);
+ *
+ * @name throw
+ * @alias Throw
+ * @param {Function} function
+ * @param {ErrorConstructor} constructor
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Should
+ * @api public
+ */
+
+ should.Throw = function (fn, errt, errs, msg) {
+ new Assertion(fn, msg).to.Throw(errt, errs);
+ };
+
+ /**
+ * ### .exist
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var foo = 'hi';
+ *
+ * should.exist(foo, 'foo exists');
+ *
+ * @name exist
+ * @namespace Should
+ * @api public
+ */
+
+ should.exist = function (val, msg) {
+ new Assertion(val, msg).to.exist;
+ }
+
+ // negation
+ should.not = {}
+
+ /**
+ * ### .not.equal(actual, expected, [message])
+ *
+ * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
+ *
+ * should.not.equal(3, 4, 'these numbers are not equal');
+ *
+ * @name not.equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.equal = function (val1, val2, msg) {
+ new Assertion(val1, msg).to.not.equal(val2);
+ };
+
+ /**
+ * ### .throw(function, [constructor/regexp], [message])
+ *
+ * Asserts that `function` will _not_ throw an error that is an instance of
+ * `constructor`, or alternately that it will not throw an error with message
+ * matching `regexp`.
+ *
+ * should.not.throw(fn, Error, 'function does not throw');
+ *
+ * @name not.throw
+ * @alias not.Throw
+ * @param {Function} function
+ * @param {ErrorConstructor} constructor
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.Throw = function (fn, errt, errs, msg) {
+ new Assertion(fn, msg).to.not.Throw(errt, errs);
+ };
+
+ /**
+ * ### .not.exist
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var bar = null;
+ *
+ * should.not.exist(bar, 'bar does not exist');
+ *
+ * @name not.exist
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.exist = function (val, msg) {
+ new Assertion(val, msg).to.not.exist;
+ }
+
+ should['throw'] = should['Throw'];
+ should.not['throw'] = should.not['Throw'];
+
+ return should;
+ };
+
+ chai.should = loadShould;
+ chai.Should = loadShould;
+};
+
+},{}],41:[function(require,module,exports){
+/*!
+ * Chai - addChainingMethod utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/*!
+ * Module variables
+ */
+
+// Check whether `Object.setPrototypeOf` is supported
+var canSetPrototype = typeof Object.setPrototypeOf === 'function';
+
+// Without `Object.setPrototypeOf` support, this module will need to add properties to a function.
+// However, some of functions' own props are not configurable and should be skipped.
+var testFn = function() {};
+var excludeNames = Object.getOwnPropertyNames(testFn).filter(function(name) {
+ var propDesc = Object.getOwnPropertyDescriptor(testFn, name);
+
+ // Note: PhantomJS 1.x includes `callee` as one of `testFn`'s own properties,
+ // but then returns `undefined` as the property descriptor for `callee`. As a
+ // workaround, we perform an otherwise unnecessary type-check for `propDesc`,
+ // and then filter it out if it's not an object as it should be.
+ if (typeof propDesc !== 'object')
+ return true;
+
+ return !propDesc.configurable;
+});
+
+// Cache `Function` properties
+var call = Function.prototype.call,
+ apply = Function.prototype.apply;
+
+/**
+ * ### .addChainableMethod(ctx, name, method, chainingBehavior)
+ *
+ * Adds a method to an object, such that the method can also be chained.
+ *
+ * utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.equal(str);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
+ *
+ * The result can then be used as both a method assertion, executing both `method` and
+ * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
+ *
+ * expect(fooStr).to.be.foo('bar');
+ * expect(fooStr).to.be.foo.equal('foo');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for `name`, when called
+ * @param {Function} chainingBehavior function to be called every time the property is accessed
+ * @namespace Utils
+ * @name addChainableMethod
+ * @api public
+ */
+
+module.exports = function addChainableMethod(ctx, name, method, chainingBehavior) {
+ if (typeof chainingBehavior !== 'function') {
+ chainingBehavior = function () { };
+ }
+
+ var chainableBehavior = {
+ method: method
+ , chainingBehavior: chainingBehavior
+ };
+
+ // save the methods so we can overwrite them later, if we need to.
+ if (!ctx.__methods) {
+ ctx.__methods = {};
+ }
+ ctx.__methods[name] = chainableBehavior;
+
+ Object.defineProperty(ctx, name,
+ { get: function chainableMethodGetter() {
+ chainableBehavior.chainingBehavior.call(this);
+
+ var chainableMethodWrapper = function () {
+ // Setting the `ssfi` flag to `chainableMethodWrapper` causes this
+ // function to be the starting point for removing implementation
+ // frames from the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then this assertion is being
+ // invoked from inside of another assertion. In this case, the `ssfi`
+ // flag has already been set by the outer assertion.
+ //
+ // Note that overwriting a chainable method merely replaces the saved
+ // methods in `ctx.__methods` instead of completely replacing the
+ // overwritten assertion. Therefore, an overwriting assertion won't
+ // set the `ssfi` or `lockSsfi` flags.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', chainableMethodWrapper);
+ }
+
+ var result = chainableBehavior.method.apply(this, arguments);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ addLengthGuard(chainableMethodWrapper, name, true);
+
+ // Use `Object.setPrototypeOf` if available
+ if (canSetPrototype) {
+ // Inherit all properties from the object by replacing the `Function` prototype
+ var prototype = Object.create(this);
+ // Restore the `call` and `apply` methods from `Function`
+ prototype.call = call;
+ prototype.apply = apply;
+ Object.setPrototypeOf(chainableMethodWrapper, prototype);
+ }
+ // Otherwise, redefine all properties (slow!)
+ else {
+ var asserterNames = Object.getOwnPropertyNames(ctx);
+ asserterNames.forEach(function (asserterName) {
+ if (excludeNames.indexOf(asserterName) !== -1) {
+ return;
+ }
+
+ var pd = Object.getOwnPropertyDescriptor(ctx, asserterName);
+ Object.defineProperty(chainableMethodWrapper, asserterName, pd);
+ });
+ }
+
+ transferFlags(this, chainableMethodWrapper);
+ return proxify(chainableMethodWrapper);
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":34,"./addLengthGuard":42,"./flag":47,"./proxify":62,"./transferFlags":64}],42:[function(require,module,exports){
+var fnLengthDesc = Object.getOwnPropertyDescriptor(function () {}, 'length');
+
+/*!
+ * Chai - addLengthGuard utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .addLengthGuard(fn, assertionName, isChainable)
+ *
+ * Define `length` as a getter on the given uninvoked method assertion. The
+ * getter acts as a guard against chaining `length` directly off of an uninvoked
+ * method assertion, which is a problem because it references `function`'s
+ * built-in `length` property instead of Chai's `length` assertion. When the
+ * getter catches the user making this mistake, it throws an error with a
+ * helpful message.
+ *
+ * There are two ways in which this mistake can be made. The first way is by
+ * chaining the `length` assertion directly off of an uninvoked chainable
+ * method. In this case, Chai suggests that the user use `lengthOf` instead. The
+ * second way is by chaining the `length` assertion directly off of an uninvoked
+ * non-chainable method. Non-chainable methods must be invoked prior to
+ * chaining. In this case, Chai suggests that the user consult the docs for the
+ * given assertion.
+ *
+ * If the `length` property of functions is unconfigurable, then return `fn`
+ * without modification.
+ *
+ * Note that in ES6, the function's `length` property is configurable, so once
+ * support for legacy environments is dropped, Chai's `length` property can
+ * replace the built-in function's `length` property, and this length guard will
+ * no longer be necessary. In the mean time, maintaining consistency across all
+ * environments is the priority.
+ *
+ * @param {Function} fn
+ * @param {String} assertionName
+ * @param {Boolean} isChainable
+ * @namespace Utils
+ * @name addLengthGuard
+ */
+
+module.exports = function addLengthGuard (fn, assertionName, isChainable) {
+ if (!fnLengthDesc.configurable) return fn;
+
+ Object.defineProperty(fn, 'length', {
+ get: function () {
+ if (isChainable) {
+ throw Error('Invalid Chai property: ' + assertionName + '.length. Due' +
+ ' to a compatibility issue, "length" cannot directly follow "' +
+ assertionName + '". Use "' + assertionName + '.lengthOf" instead.');
+ }
+
+ throw Error('Invalid Chai property: ' + assertionName + '.length. See' +
+ ' docs for proper usage of "' + assertionName + '".');
+ }
+ });
+
+ return fn;
+};
+
+},{}],43:[function(require,module,exports){
+/*!
+ * Chai - addMethod utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .addMethod(ctx, name, method)
+ *
+ * Adds a method to the prototype of an object.
+ *
+ * utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.equal(str);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(fooStr).to.be.foo('bar');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for name
+ * @namespace Utils
+ * @name addMethod
+ * @api public
+ */
+
+module.exports = function addMethod(ctx, name, method) {
+ var methodWrapper = function () {
+ // Setting the `ssfi` flag to `methodWrapper` causes this function to be the
+ // starting point for removing implementation frames from the stack trace of
+ // a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if the
+ // `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked from
+ // inside of another assertion. In the first case, the `ssfi` flag has
+ // already been set by the overwriting assertion. In the second case, the
+ // `ssfi` flag has already been set by the outer assertion.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', methodWrapper);
+ }
+
+ var result = method.apply(this, arguments);
+ if (result !== undefined)
+ return result;
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ addLengthGuard(methodWrapper, name, false);
+ ctx[name] = proxify(methodWrapper, name);
+};
+
+},{"../../chai":34,"./addLengthGuard":42,"./flag":47,"./proxify":62,"./transferFlags":64}],44:[function(require,module,exports){
+/*!
+ * Chai - addProperty utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var flag = require('./flag');
+var isProxyEnabled = require('./isProxyEnabled');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .addProperty(ctx, name, getter)
+ *
+ * Adds a property to the prototype of an object.
+ *
+ * utils.addProperty(chai.Assertion.prototype, 'foo', function () {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.instanceof(Foo);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addProperty('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.be.foo;
+ *
+ * @param {Object} ctx object to which the property is added
+ * @param {String} name of property to add
+ * @param {Function} getter function to be used for name
+ * @namespace Utils
+ * @name addProperty
+ * @api public
+ */
+
+module.exports = function addProperty(ctx, name, getter) {
+ getter = getter === undefined ? function () {} : getter;
+
+ Object.defineProperty(ctx, name,
+ { get: function propertyGetter() {
+ // Setting the `ssfi` flag to `propertyGetter` causes this function to
+ // be the starting point for removing implementation frames from the
+ // stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set and proxy protection is disabled.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked
+ // from inside of another assertion. In the first case, the `ssfi` flag
+ // has already been set by the overwriting assertion. In the second
+ // case, the `ssfi` flag has already been set by the outer assertion.
+ //
+ // If proxy protection is enabled, then the `ssfi` flag has already been
+ // set by the proxy getter.
+ if (!isProxyEnabled() && !flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', propertyGetter);
+ }
+
+ var result = getter.call(this);
+ if (result !== undefined)
+ return result;
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":34,"./flag":47,"./isProxyEnabled":57,"./transferFlags":64}],45:[function(require,module,exports){
+/*!
+ * Chai - compareByInspect utility
+ * Copyright(c) 2011-2016 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var inspect = require('./inspect');
+
+/**
+ * ### .compareByInspect(mixed, mixed)
+ *
+ * To be used as a compareFunction with Array.prototype.sort. Compares elements
+ * using inspect instead of default behavior of using toString so that Symbols
+ * and objects with irregular/missing toString can still be sorted without a
+ * TypeError.
+ *
+ * @param {Mixed} first element to compare
+ * @param {Mixed} second element to compare
+ * @returns {Number} -1 if 'a' should come before 'b'; otherwise 1
+ * @name compareByInspect
+ * @namespace Utils
+ * @api public
+ */
+
+module.exports = function compareByInspect(a, b) {
+ return inspect(a) < inspect(b) ? -1 : 1;
+};
+
+},{"./inspect":55}],46:[function(require,module,exports){
+/*!
+ * Chai - expectTypes utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .expectTypes(obj, types)
+ *
+ * Ensures that the object being tested against is of a valid type.
+ *
+ * utils.expectTypes(this, ['array', 'object', 'string']);
+ *
+ * @param {Mixed} obj constructed Assertion
+ * @param {Array} type A list of allowed types for this assertion
+ * @namespace Utils
+ * @name expectTypes
+ * @api public
+ */
+
+var AssertionError = require('assertion-error');
+var flag = require('./flag');
+var type = require('type-detect');
+
+module.exports = function expectTypes(obj, types) {
+ var flagMsg = flag(obj, 'message');
+ var ssfi = flag(obj, 'ssfi');
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ obj = flag(obj, 'object');
+ types = types.map(function (t) { return t.toLowerCase(); });
+ types.sort();
+
+ // Transforms ['lorem', 'ipsum'] into 'a lorem, or an ipsum'
+ var str = types.map(function (t, index) {
+ var art = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(t.charAt(0)) ? 'an' : 'a';
+ var or = types.length > 1 && index === types.length - 1 ? 'or ' : '';
+ return or + art + ' ' + t;
+ }).join(', ');
+
+ var objType = type(obj).toLowerCase();
+
+ if (!types.some(function (expected) { return objType === expected; })) {
+ throw new AssertionError(
+ flagMsg + 'object tested must be ' + str + ', but ' + objType + ' given',
+ undefined,
+ ssfi
+ );
+ }
+};
+
+},{"./flag":47,"assertion-error":5,"type-detect":75}],47:[function(require,module,exports){
+/*!
+ * Chai - flag utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .flag(object, key, [value])
+ *
+ * Get or set a flag value on an object. If a
+ * value is provided it will be set, else it will
+ * return the currently set value or `undefined` if
+ * the value is not set.
+ *
+ * utils.flag(this, 'foo', 'bar'); // setter
+ * utils.flag(this, 'foo'); // getter, returns `bar`
+ *
+ * @param {Object} object constructed Assertion
+ * @param {String} key
+ * @param {Mixed} value (optional)
+ * @namespace Utils
+ * @name flag
+ * @api private
+ */
+
+module.exports = function flag(obj, key, value) {
+ var flags = obj.__flags || (obj.__flags = Object.create(null));
+ if (arguments.length === 3) {
+ flags[key] = value;
+ } else {
+ return flags[key];
+ }
+};
+
+},{}],48:[function(require,module,exports){
+/*!
+ * Chai - getActual utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .getActual(object, [actual])
+ *
+ * Returns the `actual` value for an Assertion.
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name getActual
+ */
+
+module.exports = function getActual(obj, args) {
+ return args.length > 4 ? args[4] : obj._obj;
+};
+
+},{}],49:[function(require,module,exports){
+/*!
+ * Chai - getEnumerableProperties utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .getEnumerableProperties(object)
+ *
+ * This allows the retrieval of enumerable property names of an object,
+ * inherited or not.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getEnumerableProperties
+ * @api public
+ */
+
+module.exports = function getEnumerableProperties(object) {
+ var result = [];
+ for (var name in object) {
+ result.push(name);
+ }
+ return result;
+};
+
+},{}],50:[function(require,module,exports){
+/*!
+ * Chai - message composition utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var flag = require('./flag')
+ , getActual = require('./getActual')
+ , objDisplay = require('./objDisplay');
+
+/**
+ * ### .getMessage(object, message, negateMessage)
+ *
+ * Construct the error message based on flags
+ * and template tags. Template tags will return
+ * a stringified inspection of the object referenced.
+ *
+ * Message template tags:
+ * - `#{this}` current asserted object
+ * - `#{act}` actual value
+ * - `#{exp}` expected value
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name getMessage
+ * @api public
+ */
+
+module.exports = function getMessage(obj, args) {
+ var negate = flag(obj, 'negate')
+ , val = flag(obj, 'object')
+ , expected = args[3]
+ , actual = getActual(obj, args)
+ , msg = negate ? args[2] : args[1]
+ , flagMsg = flag(obj, 'message');
+
+ if(typeof msg === "function") msg = msg();
+ msg = msg || '';
+ msg = msg
+ .replace(/#\{this\}/g, function () { return objDisplay(val); })
+ .replace(/#\{act\}/g, function () { return objDisplay(actual); })
+ .replace(/#\{exp\}/g, function () { return objDisplay(expected); });
+
+ return flagMsg ? flagMsg + ': ' + msg : msg;
+};
+
+},{"./flag":47,"./getActual":48,"./objDisplay":58}],51:[function(require,module,exports){
+/*!
+ * Chai - getOwnEnumerableProperties utility
+ * Copyright(c) 2011-2016 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var getOwnEnumerablePropertySymbols = require('./getOwnEnumerablePropertySymbols');
+
+/**
+ * ### .getOwnEnumerableProperties(object)
+ *
+ * This allows the retrieval of directly-owned enumerable property names and
+ * symbols of an object. This function is necessary because Object.keys only
+ * returns enumerable property names, not enumerable property symbols.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getOwnEnumerableProperties
+ * @api public
+ */
+
+module.exports = function getOwnEnumerableProperties(obj) {
+ return Object.keys(obj).concat(getOwnEnumerablePropertySymbols(obj));
+};
+
+},{"./getOwnEnumerablePropertySymbols":52}],52:[function(require,module,exports){
+/*!
+ * Chai - getOwnEnumerablePropertySymbols utility
+ * Copyright(c) 2011-2016 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .getOwnEnumerablePropertySymbols(object)
+ *
+ * This allows the retrieval of directly-owned enumerable property symbols of an
+ * object. This function is necessary because Object.getOwnPropertySymbols
+ * returns both enumerable and non-enumerable property symbols.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getOwnEnumerablePropertySymbols
+ * @api public
+ */
+
+module.exports = function getOwnEnumerablePropertySymbols(obj) {
+ if (typeof Object.getOwnPropertySymbols !== 'function') return [];
+
+ return Object.getOwnPropertySymbols(obj).filter(function (sym) {
+ return Object.getOwnPropertyDescriptor(obj, sym).enumerable;
+ });
+};
+
+},{}],53:[function(require,module,exports){
+/*!
+ * Chai - getProperties utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .getProperties(object)
+ *
+ * This allows the retrieval of property names of an object, enumerable or not,
+ * inherited or not.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getProperties
+ * @api public
+ */
+
+module.exports = function getProperties(object) {
+ var result = Object.getOwnPropertyNames(object);
+
+ function addProperty(property) {
+ if (result.indexOf(property) === -1) {
+ result.push(property);
+ }
+ }
+
+ var proto = Object.getPrototypeOf(object);
+ while (proto !== null) {
+ Object.getOwnPropertyNames(proto).forEach(addProperty);
+ proto = Object.getPrototypeOf(proto);
+ }
+
+ return result;
+};
+
+},{}],54:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Dependencies that are used for multiple exports are required here only once
+ */
+
+var pathval = require('pathval');
+
+/*!
+ * test utility
+ */
+
+exports.test = require('./test');
+
+/*!
+ * type utility
+ */
+
+exports.type = require('type-detect');
+
+/*!
+ * expectTypes utility
+ */
+exports.expectTypes = require('./expectTypes');
+
+/*!
+ * message utility
+ */
+
+exports.getMessage = require('./getMessage');
+
+/*!
+ * actual utility
+ */
+
+exports.getActual = require('./getActual');
+
+/*!
+ * Inspect util
+ */
+
+exports.inspect = require('./inspect');
+
+/*!
+ * Object Display util
+ */
+
+exports.objDisplay = require('./objDisplay');
+
+/*!
+ * Flag utility
+ */
+
+exports.flag = require('./flag');
+
+/*!
+ * Flag transferring utility
+ */
+
+exports.transferFlags = require('./transferFlags');
+
+/*!
+ * Deep equal utility
+ */
+
+exports.eql = require('deep-eql');
+
+/*!
+ * Deep path info
+ */
+
+exports.getPathInfo = pathval.getPathInfo;
+
+/*!
+ * Check if a property exists
+ */
+
+exports.hasProperty = pathval.hasProperty;
+
+/*!
+ * Function name
+ */
+
+exports.getName = require('get-func-name');
+
+/*!
+ * add Property
+ */
+
+exports.addProperty = require('./addProperty');
+
+/*!
+ * add Method
+ */
+
+exports.addMethod = require('./addMethod');
+
+/*!
+ * overwrite Property
+ */
+
+exports.overwriteProperty = require('./overwriteProperty');
+
+/*!
+ * overwrite Method
+ */
+
+exports.overwriteMethod = require('./overwriteMethod');
+
+/*!
+ * Add a chainable method
+ */
+
+exports.addChainableMethod = require('./addChainableMethod');
+
+/*!
+ * Overwrite chainable method
+ */
+
+exports.overwriteChainableMethod = require('./overwriteChainableMethod');
+
+/*!
+ * Compare by inspect method
+ */
+
+exports.compareByInspect = require('./compareByInspect');
+
+/*!
+ * Get own enumerable property symbols method
+ */
+
+exports.getOwnEnumerablePropertySymbols = require('./getOwnEnumerablePropertySymbols');
+
+/*!
+ * Get own enumerable properties method
+ */
+
+exports.getOwnEnumerableProperties = require('./getOwnEnumerableProperties');
+
+/*!
+ * Checks error against a given set of criteria
+ */
+
+exports.checkError = require('check-error');
+
+/*!
+ * Proxify util
+ */
+
+exports.proxify = require('./proxify');
+
+/*!
+ * addLengthGuard util
+ */
+
+exports.addLengthGuard = require('./addLengthGuard');
+
+/*!
+ * isProxyEnabled helper
+ */
+
+exports.isProxyEnabled = require('./isProxyEnabled');
+
+/*!
+ * isNaN method
+ */
+
+exports.isNaN = require('./isNaN');
+
+},{"./addChainableMethod":41,"./addLengthGuard":42,"./addMethod":43,"./addProperty":44,"./compareByInspect":45,"./expectTypes":46,"./flag":47,"./getActual":48,"./getMessage":50,"./getOwnEnumerableProperties":51,"./getOwnEnumerablePropertySymbols":52,"./inspect":55,"./isNaN":56,"./isProxyEnabled":57,"./objDisplay":58,"./overwriteChainableMethod":59,"./overwriteMethod":60,"./overwriteProperty":61,"./proxify":62,"./test":63,"./transferFlags":64,"check-error":65,"deep-eql":66,"get-func-name":67,"pathval":69,"type-detect":75}],55:[function(require,module,exports){
+// This is (almost) directly from Node.js utils
+// https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
+
+var getName = require('get-func-name');
+var getProperties = require('./getProperties');
+var getEnumerableProperties = require('./getEnumerableProperties');
+var config = require('../config');
+
+module.exports = inspect;
+
+/**
+ * ### .inspect(obj, [showHidden], [depth], [colors])
+ *
+ * Echoes the value of a value. Tries to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
+ * properties of objects. Default is false.
+ * @param {Number} depth Depth in which to descend in object. Default is 2.
+ * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
+ * output. Default is false (no coloring).
+ * @namespace Utils
+ * @name inspect
+ */
+function inspect(obj, showHidden, depth, colors) {
+ var ctx = {
+ showHidden: showHidden,
+ seen: [],
+ stylize: function (str) { return str; }
+ };
+ return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
+}
+
+// Returns true if object is a DOM element.
+var isDOMElement = function (object) {
+ if (typeof HTMLElement === 'object') {
+ return object instanceof HTMLElement;
+ } else {
+ return object &&
+ typeof object === 'object' &&
+ 'nodeType' in object &&
+ object.nodeType === 1 &&
+ typeof object.nodeName === 'string';
+ }
+};
+
+function formatValue(ctx, value, recurseTimes) {
+ // Provide a hook for user-specified inspect functions.
+ // Check that value is an object with an inspect function on it
+ if (value && typeof value.inspect === 'function' &&
+ // Filter out the util module, it's inspect function is special
+ value.inspect !== exports.inspect &&
+ // Also filter out any prototype objects using the circular check.
+ !(value.constructor && value.constructor.prototype === value)) {
+ var ret = value.inspect(recurseTimes, ctx);
+ if (typeof ret !== 'string') {
+ ret = formatValue(ctx, ret, recurseTimes);
+ }
+ return ret;
+ }
+
+ // Primitive types cannot have properties
+ var primitive = formatPrimitive(ctx, value);
+ if (primitive) {
+ return primitive;
+ }
+
+ // If this is a DOM element, try to get the outer HTML.
+ if (isDOMElement(value)) {
+ if ('outerHTML' in value) {
+ return value.outerHTML;
+ // This value does not have an outerHTML attribute,
+ // it could still be an XML element
+ } else {
+ // Attempt to serialize it
+ try {
+ if (document.xmlVersion) {
+ var xmlSerializer = new XMLSerializer();
+ return xmlSerializer.serializeToString(value);
+ } else {
+ // Firefox 11- do not support outerHTML
+ // It does, however, support innerHTML
+ // Use the following to render the element
+ var ns = "http://www.w3.org/1999/xhtml";
+ var container = document.createElementNS(ns, '_');
+
+ container.appendChild(value.cloneNode(false));
+ var html = container.innerHTML
+ .replace('><', '>' + value.innerHTML + '<');
+ container.innerHTML = '';
+ return html;
+ }
+ } catch (err) {
+ // This could be a non-native DOM implementation,
+ // continue with the normal flow:
+ // printing the element as if it is an object.
+ }
+ }
+ }
+
+ // Look up the keys of the object.
+ var visibleKeys = getEnumerableProperties(value);
+ var keys = ctx.showHidden ? getProperties(value) : visibleKeys;
+
+ var name, nameSuffix;
+
+ // Some type of object without properties can be shortcut.
+ // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
+ // a `stack` plus `description` property; ignore those for consistency.
+ if (keys.length === 0 || (isError(value) && (
+ (keys.length === 1 && keys[0] === 'stack') ||
+ (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
+ ))) {
+ if (typeof value === 'function') {
+ name = getName(value);
+ nameSuffix = name ? ': ' + name : '';
+ return ctx.stylize('[Function' + nameSuffix + ']', 'special');
+ }
+ if (isRegExp(value)) {
+ return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+ }
+ if (isDate(value)) {
+ return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
+ }
+ if (isError(value)) {
+ return formatError(value);
+ }
+ }
+
+ var base = ''
+ , array = false
+ , typedArray = false
+ , braces = ['{', '}'];
+
+ if (isTypedArray(value)) {
+ typedArray = true;
+ braces = ['[', ']'];
+ }
+
+ // Make Array say that they are Array
+ if (isArray(value)) {
+ array = true;
+ braces = ['[', ']'];
+ }
+
+ // Make functions say that they are functions
+ if (typeof value === 'function') {
+ name = getName(value);
+ nameSuffix = name ? ': ' + name : '';
+ base = ' [Function' + nameSuffix + ']';
+ }
+
+ // Make RegExps say that they are RegExps
+ if (isRegExp(value)) {
+ base = ' ' + RegExp.prototype.toString.call(value);
+ }
+
+ // Make dates with properties first say the date
+ if (isDate(value)) {
+ base = ' ' + Date.prototype.toUTCString.call(value);
+ }
+
+ // Make error with message first say the error
+ if (isError(value)) {
+ return formatError(value);
+ }
+
+ if (keys.length === 0 && (!array || value.length == 0)) {
+ return braces[0] + base + braces[1];
+ }
+
+ if (recurseTimes < 0) {
+ if (isRegExp(value)) {
+ return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+ } else {
+ return ctx.stylize('[Object]', 'special');
+ }
+ }
+
+ ctx.seen.push(value);
+
+ var output;
+ if (array) {
+ output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+ } else if (typedArray) {
+ return formatTypedArray(value);
+ } else {
+ output = keys.map(function(key) {
+ return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+ });
+ }
+
+ ctx.seen.pop();
+
+ return reduceToSingleString(output, base, braces);
+}
+
+function formatPrimitive(ctx, value) {
+ switch (typeof value) {
+ case 'undefined':
+ return ctx.stylize('undefined', 'undefined');
+
+ case 'string':
+ var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+ .replace(/'/g, "\\'")
+ .replace(/\\"/g, '"') + '\'';
+ return ctx.stylize(simple, 'string');
+
+ case 'number':
+ if (value === 0 && (1/value) === -Infinity) {
+ return ctx.stylize('-0', 'number');
+ }
+ return ctx.stylize('' + value, 'number');
+
+ case 'boolean':
+ return ctx.stylize('' + value, 'boolean');
+
+ case 'symbol':
+ return ctx.stylize(value.toString(), 'symbol');
+ }
+ // For some reason typeof null is "object", so special case here.
+ if (value === null) {
+ return ctx.stylize('null', 'null');
+ }
+}
+
+function formatError(value) {
+ return '[' + Error.prototype.toString.call(value) + ']';
+}
+
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+ var output = [];
+ for (var i = 0, l = value.length; i < l; ++i) {
+ if (Object.prototype.hasOwnProperty.call(value, String(i))) {
+ output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+ String(i), true));
+ } else {
+ output.push('');
+ }
+ }
+
+ keys.forEach(function(key) {
+ if (!key.match(/^\d+$/)) {
+ output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+ key, true));
+ }
+ });
+ return output;
+}
+
+function formatTypedArray(value) {
+ var str = '[ ';
+
+ for (var i = 0; i < value.length; ++i) {
+ if (str.length >= config.truncateThreshold - 7) {
+ str += '...';
+ break;
+ }
+ str += value[i] + ', ';
+ }
+ str += ' ]';
+
+ // Removing trailing `, ` if the array was not truncated
+ if (str.indexOf(', ]') !== -1) {
+ str = str.replace(', ]', ' ]');
+ }
+
+ return str;
+}
+
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+ var name;
+ var propDescriptor = Object.getOwnPropertyDescriptor(value, key);
+ var str;
+
+ if (propDescriptor) {
+ if (propDescriptor.get) {
+ if (propDescriptor.set) {
+ str = ctx.stylize('[Getter/Setter]', 'special');
+ } else {
+ str = ctx.stylize('[Getter]', 'special');
+ }
+ } else {
+ if (propDescriptor.set) {
+ str = ctx.stylize('[Setter]', 'special');
+ }
+ }
+ }
+ if (visibleKeys.indexOf(key) < 0) {
+ name = '[' + key + ']';
+ }
+ if (!str) {
+ if (ctx.seen.indexOf(value[key]) < 0) {
+ if (recurseTimes === null) {
+ str = formatValue(ctx, value[key], null);
+ } else {
+ str = formatValue(ctx, value[key], recurseTimes - 1);
+ }
+ if (str.indexOf('\n') > -1) {
+ if (array) {
+ str = str.split('\n').map(function(line) {
+ return ' ' + line;
+ }).join('\n').substr(2);
+ } else {
+ str = '\n' + str.split('\n').map(function(line) {
+ return ' ' + line;
+ }).join('\n');
+ }
+ }
+ } else {
+ str = ctx.stylize('[Circular]', 'special');
+ }
+ }
+ if (typeof name === 'undefined') {
+ if (array && key.match(/^\d+$/)) {
+ return str;
+ }
+ name = JSON.stringify('' + key);
+ if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+ name = name.substr(1, name.length - 2);
+ name = ctx.stylize(name, 'name');
+ } else {
+ name = name.replace(/'/g, "\\'")
+ .replace(/\\"/g, '"')
+ .replace(/(^"|"$)/g, "'");
+ name = ctx.stylize(name, 'string');
+ }
+ }
+
+ return name + ': ' + str;
+}
+
+function reduceToSingleString(output, base, braces) {
+ var length = output.reduce(function(prev, cur) {
+ return prev + cur.length + 1;
+ }, 0);
+
+ if (length > 60) {
+ return braces[0] +
+ (base === '' ? '' : base + '\n ') +
+ ' ' +
+ output.join(',\n ') +
+ ' ' +
+ braces[1];
+ }
+
+ return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
+
+function isTypedArray(ar) {
+ // Unfortunately there's no way to check if an object is a TypedArray
+ // We have to check if it's one of these types
+ return (typeof ar === 'object' && /\w+Array]$/.test(objectToString(ar)));
+}
+
+function isArray(ar) {
+ return Array.isArray(ar) ||
+ (typeof ar === 'object' && objectToString(ar) === '[object Array]');
+}
+
+function isRegExp(re) {
+ return typeof re === 'object' && objectToString(re) === '[object RegExp]';
+}
+
+function isDate(d) {
+ return typeof d === 'object' && objectToString(d) === '[object Date]';
+}
+
+function isError(e) {
+ return typeof e === 'object' && objectToString(e) === '[object Error]';
+}
+
+function objectToString(o) {
+ return Object.prototype.toString.call(o);
+}
+
+},{"../config":36,"./getEnumerableProperties":49,"./getProperties":53,"get-func-name":67}],56:[function(require,module,exports){
+/*!
+ * Chai - isNaN utility
+ * Copyright(c) 2012-2015 Sakthipriyan Vairamani
+ * MIT Licensed
+ */
+
+/**
+ * ### .isNaN(value)
+ *
+ * Checks if the given value is NaN or not.
+ *
+ * utils.isNaN(NaN); // true
+ *
+ * @param {Value} The value which has to be checked if it is NaN
+ * @name isNaN
+ * @api private
+ */
+
+function isNaN(value) {
+ // Refer http://www.ecma-international.org/ecma-262/6.0/#sec-isnan-number
+ // section's NOTE.
+ return value !== value;
+}
+
+// If ECMAScript 6's Number.isNaN is present, prefer that.
+module.exports = Number.isNaN || isNaN;
+
+},{}],57:[function(require,module,exports){
+var config = require('../config');
+
+/*!
+ * Chai - isProxyEnabled helper
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .isProxyEnabled()
+ *
+ * Helper function to check if Chai's proxy protection feature is enabled. If
+ * proxies are unsupported or disabled via the user's Chai config, then return
+ * false. Otherwise, return true.
+ *
+ * @namespace Utils
+ * @name isProxyEnabled
+ */
+
+module.exports = function isProxyEnabled() {
+ return config.useProxy &&
+ typeof Proxy !== 'undefined' &&
+ typeof Reflect !== 'undefined';
+};
+
+},{"../config":36}],58:[function(require,module,exports){
+/*!
+ * Chai - flag utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var inspect = require('./inspect');
+var config = require('../config');
+
+/**
+ * ### .objDisplay(object)
+ *
+ * Determines if an object or an array matches
+ * criteria to be inspected in-line for error
+ * messages or should be truncated.
+ *
+ * @param {Mixed} javascript object to inspect
+ * @name objDisplay
+ * @namespace Utils
+ * @api public
+ */
+
+module.exports = function objDisplay(obj) {
+ var str = inspect(obj)
+ , type = Object.prototype.toString.call(obj);
+
+ if (config.truncateThreshold && str.length >= config.truncateThreshold) {
+ if (type === '[object Function]') {
+ return !obj.name || obj.name === ''
+ ? '[Function]'
+ : '[Function: ' + obj.name + ']';
+ } else if (type === '[object Array]') {
+ return '[ Array(' + obj.length + ') ]';
+ } else if (type === '[object Object]') {
+ var keys = Object.keys(obj)
+ , kstr = keys.length > 2
+ ? keys.splice(0, 2).join(', ') + ', ...'
+ : keys.join(', ');
+ return '{ Object (' + kstr + ') }';
+ } else {
+ return str;
+ }
+ } else {
+ return str;
+ }
+};
+
+},{"../config":36,"./inspect":55}],59:[function(require,module,exports){
+/*!
+ * Chai - overwriteChainableMethod utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteChainableMethod(ctx, name, method, chainingBehavior)
+ *
+ * Overwrites an already existing chainable method
+ * and provides access to the previous function or
+ * property. Must return functions to be used for
+ * name.
+ *
+ * utils.overwriteChainableMethod(chai.Assertion.prototype, 'lengthOf',
+ * function (_super) {
+ * }
+ * , function (_super) {
+ * }
+ * );
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteChainableMethod('foo', fn, fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.have.lengthOf(3);
+ * expect(myFoo).to.have.lengthOf.above(3);
+ *
+ * @param {Object} ctx object whose method / property is to be overwritten
+ * @param {String} name of method / property to overwrite
+ * @param {Function} method function that returns a function to be used for name
+ * @param {Function} chainingBehavior function that returns a function to be used for property
+ * @namespace Utils
+ * @name overwriteChainableMethod
+ * @api public
+ */
+
+module.exports = function overwriteChainableMethod(ctx, name, method, chainingBehavior) {
+ var chainableBehavior = ctx.__methods[name];
+
+ var _chainingBehavior = chainableBehavior.chainingBehavior;
+ chainableBehavior.chainingBehavior = function overwritingChainableMethodGetter() {
+ var result = chainingBehavior(_chainingBehavior).call(this);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ var _method = chainableBehavior.method;
+ chainableBehavior.method = function overwritingChainableMethodWrapper() {
+ var result = method(_method).apply(this, arguments);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+};
+
+},{"../../chai":34,"./transferFlags":64}],60:[function(require,module,exports){
+/*!
+ * Chai - overwriteMethod utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteMethod(ctx, name, fn)
+ *
+ * Overwrites an already existing method and provides
+ * access to previous function. Must return function
+ * to be used for name.
+ *
+ * utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
+ * return function (str) {
+ * var obj = utils.flag(this, 'object');
+ * if (obj instanceof Foo) {
+ * new chai.Assertion(obj.value).to.equal(str);
+ * } else {
+ * _super.apply(this, arguments);
+ * }
+ * }
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.equal('bar');
+ *
+ * @param {Object} ctx object whose method is to be overwritten
+ * @param {String} name of method to overwrite
+ * @param {Function} method function that returns a function to be used for name
+ * @namespace Utils
+ * @name overwriteMethod
+ * @api public
+ */
+
+module.exports = function overwriteMethod(ctx, name, method) {
+ var _method = ctx[name]
+ , _super = function () {
+ throw new Error(name + ' is not a function');
+ };
+
+ if (_method && 'function' === typeof _method)
+ _super = _method;
+
+ var overwritingMethodWrapper = function () {
+ // Setting the `ssfi` flag to `overwritingMethodWrapper` causes this
+ // function to be the starting point for removing implementation frames from
+ // the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if the
+ // `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked from
+ // inside of another assertion. In the first case, the `ssfi` flag has
+ // already been set by the overwriting assertion. In the second case, the
+ // `ssfi` flag has already been set by the outer assertion.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', overwritingMethodWrapper);
+ }
+
+ // Setting the `lockSsfi` flag to `true` prevents the overwritten assertion
+ // from changing the `ssfi` flag. By this point, the `ssfi` flag is already
+ // set to the correct starting point for this assertion.
+ var origLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ var result = method(_super).apply(this, arguments);
+ flag(this, 'lockSsfi', origLockSsfi);
+
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+
+ addLengthGuard(overwritingMethodWrapper, name, false);
+ ctx[name] = proxify(overwritingMethodWrapper, name);
+};
+
+},{"../../chai":34,"./addLengthGuard":42,"./flag":47,"./proxify":62,"./transferFlags":64}],61:[function(require,module,exports){
+/*!
+ * Chai - overwriteProperty utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var flag = require('./flag');
+var isProxyEnabled = require('./isProxyEnabled');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteProperty(ctx, name, fn)
+ *
+ * Overwrites an already existing property getter and provides
+ * access to previous value. Must return function to use as getter.
+ *
+ * utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
+ * return function () {
+ * var obj = utils.flag(this, 'object');
+ * if (obj instanceof Foo) {
+ * new chai.Assertion(obj.name).to.equal('bar');
+ * } else {
+ * _super.call(this);
+ * }
+ * }
+ * });
+ *
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteProperty('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.be.ok;
+ *
+ * @param {Object} ctx object whose property is to be overwritten
+ * @param {String} name of property to overwrite
+ * @param {Function} getter function that returns a getter function to be used for name
+ * @namespace Utils
+ * @name overwriteProperty
+ * @api public
+ */
+
+module.exports = function overwriteProperty(ctx, name, getter) {
+ var _get = Object.getOwnPropertyDescriptor(ctx, name)
+ , _super = function () {};
+
+ if (_get && 'function' === typeof _get.get)
+ _super = _get.get
+
+ Object.defineProperty(ctx, name,
+ { get: function overwritingPropertyGetter() {
+ // Setting the `ssfi` flag to `overwritingPropertyGetter` causes this
+ // function to be the starting point for removing implementation frames
+ // from the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set and proxy protection is disabled.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked
+ // from inside of another assertion. In the first case, the `ssfi` flag
+ // has already been set by the overwriting assertion. In the second
+ // case, the `ssfi` flag has already been set by the outer assertion.
+ //
+ // If proxy protection is enabled, then the `ssfi` flag has already been
+ // set by the proxy getter.
+ if (!isProxyEnabled() && !flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', overwritingPropertyGetter);
+ }
+
+ // Setting the `lockSsfi` flag to `true` prevents the overwritten
+ // assertion from changing the `ssfi` flag. By this point, the `ssfi`
+ // flag is already set to the correct starting point for this assertion.
+ var origLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ var result = getter(_super).call(this);
+ flag(this, 'lockSsfi', origLockSsfi);
+
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":34,"./flag":47,"./isProxyEnabled":57,"./transferFlags":64}],62:[function(require,module,exports){
+var config = require('../config');
+var flag = require('./flag');
+var getProperties = require('./getProperties');
+var isProxyEnabled = require('./isProxyEnabled');
+
+/*!
+ * Chai - proxify utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .proxify(object)
+ *
+ * Return a proxy of given object that throws an error when a non-existent
+ * property is read. By default, the root cause is assumed to be a misspelled
+ * property, and thus an attempt is made to offer a reasonable suggestion from
+ * the list of existing properties. However, if a nonChainableMethodName is
+ * provided, then the root cause is instead a failure to invoke a non-chainable
+ * method prior to reading the non-existent property.
+ *
+ * If proxies are unsupported or disabled via the user's Chai config, then
+ * return object without modification.
+ *
+ * @param {Object} obj
+ * @param {String} nonChainableMethodName
+ * @namespace Utils
+ * @name proxify
+ */
+
+var builtins = ['__flags', '__methods', '_obj', 'assert'];
+
+module.exports = function proxify(obj, nonChainableMethodName) {
+ if (!isProxyEnabled()) return obj;
+
+ return new Proxy(obj, {
+ get: function proxyGetter(target, property) {
+ // This check is here because we should not throw errors on Symbol properties
+ // such as `Symbol.toStringTag`.
+ // The values for which an error should be thrown can be configured using
+ // the `config.proxyExcludedKeys` setting.
+ if (typeof property === 'string' &&
+ config.proxyExcludedKeys.indexOf(property) === -1 &&
+ !Reflect.has(target, property)) {
+ // Special message for invalid property access of non-chainable methods.
+ if (nonChainableMethodName) {
+ throw Error('Invalid Chai property: ' + nonChainableMethodName + '.' +
+ property + '. See docs for proper usage of "' +
+ nonChainableMethodName + '".');
+ }
+
+ // If the property is reasonably close to an existing Chai property,
+ // suggest that property to the user. Only suggest properties with a
+ // distance less than 4.
+ var suggestion = null;
+ var suggestionDistance = 4;
+ getProperties(target).forEach(function(prop) {
+ if (
+ !Object.prototype.hasOwnProperty(prop) &&
+ builtins.indexOf(prop) === -1
+ ) {
+ var dist = stringDistanceCapped(
+ property,
+ prop,
+ suggestionDistance
+ );
+ if (dist < suggestionDistance) {
+ suggestion = prop;
+ suggestionDistance = dist;
+ }
+ }
+ });
+
+ if (suggestion !== null) {
+ throw Error('Invalid Chai property: ' + property +
+ '. Did you mean "' + suggestion + '"?');
+ } else {
+ throw Error('Invalid Chai property: ' + property);
+ }
+ }
+
+ // Use this proxy getter as the starting point for removing implementation
+ // frames from the stack trace of a failed assertion. For property
+ // assertions, this prevents the proxy getter from showing up in the stack
+ // trace since it's invoked before the property getter. For method and
+ // chainable method assertions, this flag will end up getting changed to
+ // the method wrapper, which is good since this frame will no longer be in
+ // the stack once the method is invoked. Note that Chai builtin assertion
+ // properties such as `__flags` are skipped since this is only meant to
+ // capture the starting point of an assertion. This step is also skipped
+ // if the `lockSsfi` flag is set, thus indicating that this assertion is
+ // being called from within another assertion. In that case, the `ssfi`
+ // flag is already set to the outer assertion's starting point.
+ if (builtins.indexOf(property) === -1 && !flag(target, 'lockSsfi')) {
+ flag(target, 'ssfi', proxyGetter);
+ }
+
+ return Reflect.get(target, property);
+ }
+ });
+};
+
+/**
+ * # stringDistanceCapped(strA, strB, cap)
+ * Return the Levenshtein distance between two strings, but no more than cap.
+ * @param {string} strA
+ * @param {string} strB
+ * @param {number} number
+ * @return {number} min(string distance between strA and strB, cap)
+ * @api private
+ */
+
+function stringDistanceCapped(strA, strB, cap) {
+ if (Math.abs(strA.length - strB.length) >= cap) {
+ return cap;
+ }
+
+ var memo = [];
+ // `memo` is a two-dimensional array containing distances.
+ // memo[i][j] is the distance between strA.slice(0, i) and
+ // strB.slice(0, j).
+ for (var i = 0; i <= strA.length; i++) {
+ memo[i] = Array(strB.length + 1).fill(0);
+ memo[i][0] = i;
+ }
+ for (var j = 0; j < strB.length; j++) {
+ memo[0][j] = j;
+ }
+
+ for (var i = 1; i <= strA.length; i++) {
+ var ch = strA.charCodeAt(i - 1);
+ for (var j = 1; j <= strB.length; j++) {
+ if (Math.abs(i - j) >= cap) {
+ memo[i][j] = cap;
+ continue;
+ }
+ memo[i][j] = Math.min(
+ memo[i - 1][j] + 1,
+ memo[i][j - 1] + 1,
+ memo[i - 1][j - 1] +
+ (ch === strB.charCodeAt(j - 1) ? 0 : 1)
+ );
+ }
+ }
+
+ return memo[strA.length][strB.length];
+}
+
+},{"../config":36,"./flag":47,"./getProperties":53,"./isProxyEnabled":57}],63:[function(require,module,exports){
+/*!
+ * Chai - test utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var flag = require('./flag');
+
+/**
+ * ### .test(object, expression)
+ *
+ * Test and object for expression.
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name test
+ */
+
+module.exports = function test(obj, args) {
+ var negate = flag(obj, 'negate')
+ , expr = args[0];
+ return negate ? !expr : expr;
+};
+
+},{"./flag":47}],64:[function(require,module,exports){
+/*!
+ * Chai - transferFlags utility
+ * Copyright(c) 2012-2014 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .transferFlags(assertion, object, includeAll = true)
+ *
+ * Transfer all the flags for `assertion` to `object`. If
+ * `includeAll` is set to `false`, then the base Chai
+ * assertion flags (namely `object`, `ssfi`, `lockSsfi`,
+ * and `message`) will not be transferred.
+ *
+ *
+ * var newAssertion = new Assertion();
+ * utils.transferFlags(assertion, newAssertion);
+ *
+ * var anotherAssertion = new Assertion(myObj);
+ * utils.transferFlags(assertion, anotherAssertion, false);
+ *
+ * @param {Assertion} assertion the assertion to transfer the flags from
+ * @param {Object} object the object to transfer the flags to; usually a new assertion
+ * @param {Boolean} includeAll
+ * @namespace Utils
+ * @name transferFlags
+ * @api private
+ */
+
+module.exports = function transferFlags(assertion, object, includeAll) {
+ var flags = assertion.__flags || (assertion.__flags = Object.create(null));
+
+ if (!object.__flags) {
+ object.__flags = Object.create(null);
+ }
+
+ includeAll = arguments.length === 3 ? includeAll : true;
+
+ for (var flag in flags) {
+ if (includeAll ||
+ (flag !== 'object' && flag !== 'ssfi' && flag !== 'lockSsfi' && flag != 'message')) {
+ object.__flags[flag] = flags[flag];
+ }
+ }
+};
+
+},{}],65:[function(require,module,exports){
+'use strict';
+
+/* !
+ * Chai - checkError utility
+ * Copyright(c) 2012-2016 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .checkError
+ *
+ * Checks that an error conforms to a given set of criteria and/or retrieves information about it.
+ *
+ * @api public
+ */
+
+/**
+ * ### .compatibleInstance(thrown, errorLike)
+ *
+ * Checks if two instances are compatible (strict equal).
+ * Returns false if errorLike is not an instance of Error, because instances
+ * can only be compatible if they're both error instances.
+ *
+ * @name compatibleInstance
+ * @param {Error} thrown error
+ * @param {Error|ErrorConstructor} errorLike object to compare against
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleInstance(thrown, errorLike) {
+ return errorLike instanceof Error && thrown === errorLike;
+}
+
+/**
+ * ### .compatibleConstructor(thrown, errorLike)
+ *
+ * Checks if two constructors are compatible.
+ * This function can receive either an error constructor or
+ * an error instance as the `errorLike` argument.
+ * Constructors are compatible if they're the same or if one is
+ * an instance of another.
+ *
+ * @name compatibleConstructor
+ * @param {Error} thrown error
+ * @param {Error|ErrorConstructor} errorLike object to compare against
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleConstructor(thrown, errorLike) {
+ if (errorLike instanceof Error) {
+ // If `errorLike` is an instance of any error we compare their constructors
+ return thrown.constructor === errorLike.constructor || thrown instanceof errorLike.constructor;
+ } else if (errorLike.prototype instanceof Error || errorLike === Error) {
+ // If `errorLike` is a constructor that inherits from Error, we compare `thrown` to `errorLike` directly
+ return thrown.constructor === errorLike || thrown instanceof errorLike;
+ }
+
+ return false;
+}
+
+/**
+ * ### .compatibleMessage(thrown, errMatcher)
+ *
+ * Checks if an error's message is compatible with a matcher (String or RegExp).
+ * If the message contains the String or passes the RegExp test,
+ * it is considered compatible.
+ *
+ * @name compatibleMessage
+ * @param {Error} thrown error
+ * @param {String|RegExp} errMatcher to look for into the message
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleMessage(thrown, errMatcher) {
+ var comparisonString = typeof thrown === 'string' ? thrown : thrown.message;
+ if (errMatcher instanceof RegExp) {
+ return errMatcher.test(comparisonString);
+ } else if (typeof errMatcher === 'string') {
+ return comparisonString.indexOf(errMatcher) !== -1; // eslint-disable-line no-magic-numbers
+ }
+
+ return false;
+}
+
+/**
+ * ### .getFunctionName(constructorFn)
+ *
+ * Returns the name of a function.
+ * This also includes a polyfill function if `constructorFn.name` is not defined.
+ *
+ * @name getFunctionName
+ * @param {Function} constructorFn
+ * @namespace Utils
+ * @api private
+ */
+
+var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\(\/]+)/;
+function getFunctionName(constructorFn) {
+ var name = '';
+ if (typeof constructorFn.name === 'undefined') {
+ // Here we run a polyfill if constructorFn.name is not defined
+ var match = String(constructorFn).match(functionNameMatch);
+ if (match) {
+ name = match[1];
+ }
+ } else {
+ name = constructorFn.name;
+ }
+
+ return name;
+}
+
+/**
+ * ### .getConstructorName(errorLike)
+ *
+ * Gets the constructor name for an Error instance or constructor itself.
+ *
+ * @name getConstructorName
+ * @param {Error|ErrorConstructor} errorLike
+ * @namespace Utils
+ * @api public
+ */
+
+function getConstructorName(errorLike) {
+ var constructorName = errorLike;
+ if (errorLike instanceof Error) {
+ constructorName = getFunctionName(errorLike.constructor);
+ } else if (typeof errorLike === 'function') {
+ // If `err` is not an instance of Error it is an error constructor itself or another function.
+ // If we've got a common function we get its name, otherwise we may need to create a new instance
+ // of the error just in case it's a poorly-constructed error. Please see chaijs/chai/issues/45 to know more.
+ constructorName = getFunctionName(errorLike).trim() ||
+ getFunctionName(new errorLike()); // eslint-disable-line new-cap
+ }
+
+ return constructorName;
+}
+
+/**
+ * ### .getMessage(errorLike)
+ *
+ * Gets the error message from an error.
+ * If `err` is a String itself, we return it.
+ * If the error has no message, we return an empty string.
+ *
+ * @name getMessage
+ * @param {Error|String} errorLike
+ * @namespace Utils
+ * @api public
+ */
+
+function getMessage(errorLike) {
+ var msg = '';
+ if (errorLike && errorLike.message) {
+ msg = errorLike.message;
+ } else if (typeof errorLike === 'string') {
+ msg = errorLike;
+ }
+
+ return msg;
+}
+
+module.exports = {
+ compatibleInstance: compatibleInstance,
+ compatibleConstructor: compatibleConstructor,
+ compatibleMessage: compatibleMessage,
+ getMessage: getMessage,
+ getConstructorName: getConstructorName,
+};
+
+},{}],66:[function(require,module,exports){
+'use strict';
+/* globals Symbol: false, Uint8Array: false, WeakMap: false */
+/*!
+ * deep-eql
+ * Copyright(c) 2013 Jake Luer
+ * MIT Licensed
+ */
+
+var type = require('type-detect');
+function FakeMap() {
+ this._key = 'chai/deep-eql__' + Math.random() + Date.now();
+}
+
+FakeMap.prototype = {
+ get: function getMap(key) {
+ return key[this._key];
+ },
+ set: function setMap(key, value) {
+ if (Object.isExtensible(key)) {
+ Object.defineProperty(key, this._key, {
+ value: value,
+ configurable: true,
+ });
+ }
+ },
+};
+
+var MemoizeMap = typeof WeakMap === 'function' ? WeakMap : FakeMap;
+/*!
+ * Check to see if the MemoizeMap has recorded a result of the two operands
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {MemoizeMap} memoizeMap
+ * @returns {Boolean|null} result
+*/
+function memoizeCompare(leftHandOperand, rightHandOperand, memoizeMap) {
+ // Technically, WeakMap keys can *only* be objects, not primitives.
+ if (!memoizeMap || isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ return null;
+ }
+ var leftHandMap = memoizeMap.get(leftHandOperand);
+ if (leftHandMap) {
+ var result = leftHandMap.get(rightHandOperand);
+ if (typeof result === 'boolean') {
+ return result;
+ }
+ }
+ return null;
+}
+
+/*!
+ * Set the result of the equality into the MemoizeMap
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {MemoizeMap} memoizeMap
+ * @param {Boolean} result
+*/
+function memoizeSet(leftHandOperand, rightHandOperand, memoizeMap, result) {
+ // Technically, WeakMap keys can *only* be objects, not primitives.
+ if (!memoizeMap || isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ return;
+ }
+ var leftHandMap = memoizeMap.get(leftHandOperand);
+ if (leftHandMap) {
+ leftHandMap.set(rightHandOperand, result);
+ } else {
+ leftHandMap = new MemoizeMap();
+ leftHandMap.set(rightHandOperand, result);
+ memoizeMap.set(leftHandOperand, leftHandMap);
+ }
+}
+
+/*!
+ * Primary Export
+ */
+
+module.exports = deepEqual;
+module.exports.MemoizeMap = MemoizeMap;
+
+/**
+ * Assert deeply nested sameValue equality between two objects of any type.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (optional) Additional options
+ * @param {Array} [options.comparator] (optional) Override default algorithm, determining custom equality.
+ * @param {Array} [options.memoize] (optional) Provide a custom memoization object which will cache the results of
+ complex objects for a speed boost. By passing `false` you can disable memoization, but this will cause circular
+ references to blow the stack.
+ * @return {Boolean} equal match
+ */
+function deepEqual(leftHandOperand, rightHandOperand, options) {
+ // If we have a comparator, we can't assume anything; so bail to its check first.
+ if (options && options.comparator) {
+ return extensiveDeepEqual(leftHandOperand, rightHandOperand, options);
+ }
+
+ var simpleResult = simpleEqual(leftHandOperand, rightHandOperand);
+ if (simpleResult !== null) {
+ return simpleResult;
+ }
+
+ // Deeper comparisons are pushed through to a larger function
+ return extensiveDeepEqual(leftHandOperand, rightHandOperand, options);
+}
+
+/**
+ * Many comparisons can be canceled out early via simple equality or primitive checks.
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @return {Boolean|null} equal match
+ */
+function simpleEqual(leftHandOperand, rightHandOperand) {
+ // Equal references (except for Numbers) can be returned early
+ if (leftHandOperand === rightHandOperand) {
+ // Handle +-0 cases
+ return leftHandOperand !== 0 || 1 / leftHandOperand === 1 / rightHandOperand;
+ }
+
+ // handle NaN cases
+ if (
+ leftHandOperand !== leftHandOperand && // eslint-disable-line no-self-compare
+ rightHandOperand !== rightHandOperand // eslint-disable-line no-self-compare
+ ) {
+ return true;
+ }
+
+ // Anything that is not an 'object', i.e. symbols, functions, booleans, numbers,
+ // strings, and undefined, can be compared by reference.
+ if (isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ // Easy out b/c it would have passed the first equality check
+ return false;
+ }
+ return null;
+}
+
+/*!
+ * The main logic of the `deepEqual` function.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (optional) Additional options
+ * @param {Array} [options.comparator] (optional) Override default algorithm, determining custom equality.
+ * @param {Array} [options.memoize] (optional) Provide a custom memoization object which will cache the results of
+ complex objects for a speed boost. By passing `false` you can disable memoization, but this will cause circular
+ references to blow the stack.
+ * @return {Boolean} equal match
+*/
+function extensiveDeepEqual(leftHandOperand, rightHandOperand, options) {
+ options = options || {};
+ options.memoize = options.memoize === false ? false : options.memoize || new MemoizeMap();
+ var comparator = options && options.comparator;
+
+ // Check if a memoized result exists.
+ var memoizeResultLeft = memoizeCompare(leftHandOperand, rightHandOperand, options.memoize);
+ if (memoizeResultLeft !== null) {
+ return memoizeResultLeft;
+ }
+ var memoizeResultRight = memoizeCompare(rightHandOperand, leftHandOperand, options.memoize);
+ if (memoizeResultRight !== null) {
+ return memoizeResultRight;
+ }
+
+ // If a comparator is present, use it.
+ if (comparator) {
+ var comparatorResult = comparator(leftHandOperand, rightHandOperand);
+ // Comparators may return null, in which case we want to go back to default behavior.
+ if (comparatorResult === false || comparatorResult === true) {
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, comparatorResult);
+ return comparatorResult;
+ }
+ // To allow comparators to override *any* behavior, we ran them first. Since it didn't decide
+ // what to do, we need to make sure to return the basic tests first before we move on.
+ var simpleResult = simpleEqual(leftHandOperand, rightHandOperand);
+ if (simpleResult !== null) {
+ // Don't memoize this, it takes longer to set/retrieve than to just compare.
+ return simpleResult;
+ }
+ }
+
+ var leftHandType = type(leftHandOperand);
+ if (leftHandType !== type(rightHandOperand)) {
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, false);
+ return false;
+ }
+
+ // Temporarily set the operands in the memoize object to prevent blowing the stack
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, true);
+
+ var result = extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandType, options);
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, result);
+ return result;
+}
+
+function extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandType, options) {
+ switch (leftHandType) {
+ case 'String':
+ case 'Number':
+ case 'Boolean':
+ case 'Date':
+ // If these types are their instance types (e.g. `new Number`) then re-deepEqual against their values
+ return deepEqual(leftHandOperand.valueOf(), rightHandOperand.valueOf());
+ case 'Promise':
+ case 'Symbol':
+ case 'function':
+ case 'WeakMap':
+ case 'WeakSet':
+ case 'Error':
+ return leftHandOperand === rightHandOperand;
+ case 'Arguments':
+ case 'Int8Array':
+ case 'Uint8Array':
+ case 'Uint8ClampedArray':
+ case 'Int16Array':
+ case 'Uint16Array':
+ case 'Int32Array':
+ case 'Uint32Array':
+ case 'Float32Array':
+ case 'Float64Array':
+ case 'Array':
+ return iterableEqual(leftHandOperand, rightHandOperand, options);
+ case 'RegExp':
+ return regexpEqual(leftHandOperand, rightHandOperand);
+ case 'Generator':
+ return generatorEqual(leftHandOperand, rightHandOperand, options);
+ case 'DataView':
+ return iterableEqual(new Uint8Array(leftHandOperand.buffer), new Uint8Array(rightHandOperand.buffer), options);
+ case 'ArrayBuffer':
+ return iterableEqual(new Uint8Array(leftHandOperand), new Uint8Array(rightHandOperand), options);
+ case 'Set':
+ return entriesEqual(leftHandOperand, rightHandOperand, options);
+ case 'Map':
+ return entriesEqual(leftHandOperand, rightHandOperand, options);
+ default:
+ return objectEqual(leftHandOperand, rightHandOperand, options);
+ }
+}
+
+/*!
+ * Compare two Regular Expressions for equality.
+ *
+ * @param {RegExp} leftHandOperand
+ * @param {RegExp} rightHandOperand
+ * @return {Boolean} result
+ */
+
+function regexpEqual(leftHandOperand, rightHandOperand) {
+ return leftHandOperand.toString() === rightHandOperand.toString();
+}
+
+/*!
+ * Compare two Sets/Maps for equality. Faster than other equality functions.
+ *
+ * @param {Set} leftHandOperand
+ * @param {Set} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function entriesEqual(leftHandOperand, rightHandOperand, options) {
+ // IE11 doesn't support Set#entries or Set#@@iterator, so we need manually populate using Set#forEach
+ if (leftHandOperand.size !== rightHandOperand.size) {
+ return false;
+ }
+ if (leftHandOperand.size === 0) {
+ return true;
+ }
+ var leftHandItems = [];
+ var rightHandItems = [];
+ leftHandOperand.forEach(function gatherEntries(key, value) {
+ leftHandItems.push([ key, value ]);
+ });
+ rightHandOperand.forEach(function gatherEntries(key, value) {
+ rightHandItems.push([ key, value ]);
+ });
+ return iterableEqual(leftHandItems.sort(), rightHandItems.sort(), options);
+}
+
+/*!
+ * Simple equality for flat iterable objects such as Arrays, TypedArrays or Node.js buffers.
+ *
+ * @param {Iterable} leftHandOperand
+ * @param {Iterable} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function iterableEqual(leftHandOperand, rightHandOperand, options) {
+ var length = leftHandOperand.length;
+ if (length !== rightHandOperand.length) {
+ return false;
+ }
+ if (length === 0) {
+ return true;
+ }
+ var index = -1;
+ while (++index < length) {
+ if (deepEqual(leftHandOperand[index], rightHandOperand[index], options) === false) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/*!
+ * Simple equality for generator objects such as those returned by generator functions.
+ *
+ * @param {Iterable} leftHandOperand
+ * @param {Iterable} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function generatorEqual(leftHandOperand, rightHandOperand, options) {
+ return iterableEqual(getGeneratorEntries(leftHandOperand), getGeneratorEntries(rightHandOperand), options);
+}
+
+/*!
+ * Determine if the given object has an @@iterator function.
+ *
+ * @param {Object} target
+ * @return {Boolean} `true` if the object has an @@iterator function.
+ */
+function hasIteratorFunction(target) {
+ return typeof Symbol !== 'undefined' &&
+ typeof target === 'object' &&
+ typeof Symbol.iterator !== 'undefined' &&
+ typeof target[Symbol.iterator] === 'function';
+}
+
+/*!
+ * Gets all iterator entries from the given Object. If the Object has no @@iterator function, returns an empty array.
+ * This will consume the iterator - which could have side effects depending on the @@iterator implementation.
+ *
+ * @param {Object} target
+ * @returns {Array} an array of entries from the @@iterator function
+ */
+function getIteratorEntries(target) {
+ if (hasIteratorFunction(target)) {
+ try {
+ return getGeneratorEntries(target[Symbol.iterator]());
+ } catch (iteratorError) {
+ return [];
+ }
+ }
+ return [];
+}
+
+/*!
+ * Gets all entries from a Generator. This will consume the generator - which could have side effects.
+ *
+ * @param {Generator} target
+ * @returns {Array} an array of entries from the Generator.
+ */
+function getGeneratorEntries(generator) {
+ var generatorResult = generator.next();
+ var accumulator = [ generatorResult.value ];
+ while (generatorResult.done === false) {
+ generatorResult = generator.next();
+ accumulator.push(generatorResult.value);
+ }
+ return accumulator;
+}
+
+/*!
+ * Gets all own and inherited enumerable keys from a target.
+ *
+ * @param {Object} target
+ * @returns {Array} an array of own and inherited enumerable keys from the target.
+ */
+function getEnumerableKeys(target) {
+ var keys = [];
+ for (var key in target) {
+ keys.push(key);
+ }
+ return keys;
+}
+
+/*!
+ * Determines if two objects have matching values, given a set of keys. Defers to deepEqual for the equality check of
+ * each key. If any value of the given key is not equal, the function will return false (early).
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Array} keys An array of keys to compare the values of leftHandOperand and rightHandOperand against
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+function keysEqual(leftHandOperand, rightHandOperand, keys, options) {
+ var length = keys.length;
+ if (length === 0) {
+ return true;
+ }
+ for (var i = 0; i < length; i += 1) {
+ if (deepEqual(leftHandOperand[keys[i]], rightHandOperand[keys[i]], options) === false) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/*!
+ * Recursively check the equality of two Objects. Once basic sameness has been established it will defer to `deepEqual`
+ * for each enumerable key in the object.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function objectEqual(leftHandOperand, rightHandOperand, options) {
+ var leftHandKeys = getEnumerableKeys(leftHandOperand);
+ var rightHandKeys = getEnumerableKeys(rightHandOperand);
+ if (leftHandKeys.length && leftHandKeys.length === rightHandKeys.length) {
+ leftHandKeys.sort();
+ rightHandKeys.sort();
+ if (iterableEqual(leftHandKeys, rightHandKeys) === false) {
+ return false;
+ }
+ return keysEqual(leftHandOperand, rightHandOperand, leftHandKeys, options);
+ }
+
+ var leftHandEntries = getIteratorEntries(leftHandOperand);
+ var rightHandEntries = getIteratorEntries(rightHandOperand);
+ if (leftHandEntries.length && leftHandEntries.length === rightHandEntries.length) {
+ leftHandEntries.sort();
+ rightHandEntries.sort();
+ return iterableEqual(leftHandEntries, rightHandEntries, options);
+ }
+
+ if (leftHandKeys.length === 0 &&
+ leftHandEntries.length === 0 &&
+ rightHandKeys.length === 0 &&
+ rightHandEntries.length === 0) {
+ return true;
+ }
+
+ return false;
+}
+
+/*!
+ * Returns true if the argument is a primitive.
+ *
+ * This intentionally returns true for all objects that can be compared by reference,
+ * including functions and symbols.
+ *
+ * @param {Mixed} value
+ * @return {Boolean} result
+ */
+function isPrimitive(value) {
+ return value === null || typeof value !== 'object';
+}
+
+},{"type-detect":75}],67:[function(require,module,exports){
+'use strict';
+
+/* !
+ * Chai - getFuncName utility
+ * Copyright(c) 2012-2016 Jake Luer
+ * MIT Licensed
+ */
+
+/**
+ * ### .getFuncName(constructorFn)
+ *
+ * Returns the name of a function.
+ * When a non-function instance is passed, returns `null`.
+ * This also includes a polyfill function if `aFunc.name` is not defined.
+ *
+ * @name getFuncName
+ * @param {Function} funct
+ * @namespace Utils
+ * @api public
+ */
+
+var toString = Function.prototype.toString;
+var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\s\(\/]+)/;
+function getFuncName(aFunc) {
+ if (typeof aFunc !== 'function') {
+ return null;
+ }
+
+ var name = '';
+ if (typeof Function.prototype.name === 'undefined' && typeof aFunc.name === 'undefined') {
+ // Here we run a polyfill if Function does not support the `name` property and if aFunc.name is not defined
+ var match = toString.call(aFunc).match(functionNameMatch);
+ if (match) {
+ name = match[1];
+ }
+ } else {
+ // If we've got a `name` property we just use it
+ name = aFunc.name;
+ }
+
+ return name;
+}
+
+module.exports = getFuncName;
+
+},{}],68:[function(require,module,exports){
+(function (global){(function (){
+/**
+ * @license
+ * Lodash
+ * Based on Underscore.js 1.8.3
+ * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ */
+;(function() {
+
+ /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+ var undefined;
+
+ /** Used as the semantic version number. */
+ var VERSION = '4.17.19';
+
+ /** Used as the size to enable large array optimizations. */
+ var LARGE_ARRAY_SIZE = 200;
+
+ /** Error message constants. */
+ var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
+ FUNC_ERROR_TEXT = 'Expected a function';
+
+ /** Used to stand-in for `undefined` hash values. */
+ var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+ /** Used as the maximum memoize cache size. */
+ var MAX_MEMOIZE_SIZE = 500;
+
+ /** Used as the internal argument placeholder. */
+ var PLACEHOLDER = '__lodash_placeholder__';
+
+ /** Used to compose bitmasks for cloning. */
+ var CLONE_DEEP_FLAG = 1,
+ CLONE_FLAT_FLAG = 2,
+ CLONE_SYMBOLS_FLAG = 4;
+
+ /** Used to compose bitmasks for value comparisons. */
+ var COMPARE_PARTIAL_FLAG = 1,
+ COMPARE_UNORDERED_FLAG = 2;
+
+ /** Used to compose bitmasks for function metadata. */
+ var WRAP_BIND_FLAG = 1,
+ WRAP_BIND_KEY_FLAG = 2,
+ WRAP_CURRY_BOUND_FLAG = 4,
+ WRAP_CURRY_FLAG = 8,
+ WRAP_CURRY_RIGHT_FLAG = 16,
+ WRAP_PARTIAL_FLAG = 32,
+ WRAP_PARTIAL_RIGHT_FLAG = 64,
+ WRAP_ARY_FLAG = 128,
+ WRAP_REARG_FLAG = 256,
+ WRAP_FLIP_FLAG = 512;
+
+ /** Used as default options for `_.truncate`. */
+ var DEFAULT_TRUNC_LENGTH = 30,
+ DEFAULT_TRUNC_OMISSION = '...';
+
+ /** Used to detect hot functions by number of calls within a span of milliseconds. */
+ var HOT_COUNT = 800,
+ HOT_SPAN = 16;
+
+ /** Used to indicate the type of lazy iteratees. */
+ var LAZY_FILTER_FLAG = 1,
+ LAZY_MAP_FLAG = 2,
+ LAZY_WHILE_FLAG = 3;
+
+ /** Used as references for various `Number` constants. */
+ var INFINITY = 1 / 0,
+ MAX_SAFE_INTEGER = 9007199254740991,
+ MAX_INTEGER = 1.7976931348623157e+308,
+ NAN = 0 / 0;
+
+ /** Used as references for the maximum length and index of an array. */
+ var MAX_ARRAY_LENGTH = 4294967295,
+ MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
+ HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
+
+ /** Used to associate wrap methods with their bit flags. */
+ var wrapFlags = [
+ ['ary', WRAP_ARY_FLAG],
+ ['bind', WRAP_BIND_FLAG],
+ ['bindKey', WRAP_BIND_KEY_FLAG],
+ ['curry', WRAP_CURRY_FLAG],
+ ['curryRight', WRAP_CURRY_RIGHT_FLAG],
+ ['flip', WRAP_FLIP_FLAG],
+ ['partial', WRAP_PARTIAL_FLAG],
+ ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
+ ['rearg', WRAP_REARG_FLAG]
+ ];
+
+ /** `Object#toString` result references. */
+ var argsTag = '[object Arguments]',
+ arrayTag = '[object Array]',
+ asyncTag = '[object AsyncFunction]',
+ boolTag = '[object Boolean]',
+ dateTag = '[object Date]',
+ domExcTag = '[object DOMException]',
+ errorTag = '[object Error]',
+ funcTag = '[object Function]',
+ genTag = '[object GeneratorFunction]',
+ mapTag = '[object Map]',
+ numberTag = '[object Number]',
+ nullTag = '[object Null]',
+ objectTag = '[object Object]',
+ promiseTag = '[object Promise]',
+ proxyTag = '[object Proxy]',
+ regexpTag = '[object RegExp]',
+ setTag = '[object Set]',
+ stringTag = '[object String]',
+ symbolTag = '[object Symbol]',
+ undefinedTag = '[object Undefined]',
+ weakMapTag = '[object WeakMap]',
+ weakSetTag = '[object WeakSet]';
+
+ var arrayBufferTag = '[object ArrayBuffer]',
+ dataViewTag = '[object DataView]',
+ float32Tag = '[object Float32Array]',
+ float64Tag = '[object Float64Array]',
+ int8Tag = '[object Int8Array]',
+ int16Tag = '[object Int16Array]',
+ int32Tag = '[object Int32Array]',
+ uint8Tag = '[object Uint8Array]',
+ uint8ClampedTag = '[object Uint8ClampedArray]',
+ uint16Tag = '[object Uint16Array]',
+ uint32Tag = '[object Uint32Array]';
+
+ /** Used to match empty string literals in compiled template source. */
+ var reEmptyStringLeading = /\b__p \+= '';/g,
+ reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
+ reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
+
+ /** Used to match HTML entities and HTML characters. */
+ var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
+ reUnescapedHtml = /[&<>"']/g,
+ reHasEscapedHtml = RegExp(reEscapedHtml.source),
+ reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
+
+ /** Used to match template delimiters. */
+ var reEscape = /<%-([\s\S]+?)%>/g,
+ reEvaluate = /<%([\s\S]+?)%>/g,
+ reInterpolate = /<%=([\s\S]+?)%>/g;
+
+ /** Used to match property names within property paths. */
+ var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
+ reIsPlainProp = /^\w*$/,
+ rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
+
+ /**
+ * Used to match `RegExp`
+ * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
+ */
+ var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
+ reHasRegExpChar = RegExp(reRegExpChar.source);
+
+ /** Used to match leading and trailing whitespace. */
+ var reTrim = /^\s+|\s+$/g,
+ reTrimStart = /^\s+/,
+ reTrimEnd = /\s+$/;
+
+ /** Used to match wrap detail comments. */
+ var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
+ reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
+ reSplitDetails = /,? & /;
+
+ /** Used to match words composed of alphanumeric characters. */
+ var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
+
+ /** Used to match backslashes in property paths. */
+ var reEscapeChar = /\\(\\)?/g;
+
+ /**
+ * Used to match
+ * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
+ */
+ var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
+
+ /** Used to match `RegExp` flags from their coerced string values. */
+ var reFlags = /\w*$/;
+
+ /** Used to detect bad signed hexadecimal string values. */
+ var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+
+ /** Used to detect binary string values. */
+ var reIsBinary = /^0b[01]+$/i;
+
+ /** Used to detect host constructors (Safari). */
+ var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+ /** Used to detect octal string values. */
+ var reIsOctal = /^0o[0-7]+$/i;
+
+ /** Used to detect unsigned integer values. */
+ var reIsUint = /^(?:0|[1-9]\d*)$/;
+
+ /** Used to match Latin Unicode letters (excluding mathematical operators). */
+ var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
+
+ /** Used to ensure capturing order of template delimiters. */
+ var reNoMatch = /($^)/;
+
+ /** Used to match unescaped characters in compiled string literals. */
+ var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
+
+ /** Used to compose unicode character classes. */
+ var rsAstralRange = '\\ud800-\\udfff',
+ rsComboMarksRange = '\\u0300-\\u036f',
+ reComboHalfMarksRange = '\\ufe20-\\ufe2f',
+ rsComboSymbolsRange = '\\u20d0-\\u20ff',
+ rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
+ rsDingbatRange = '\\u2700-\\u27bf',
+ rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
+ rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
+ rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
+ rsPunctuationRange = '\\u2000-\\u206f',
+ rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
+ rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
+ rsVarRange = '\\ufe0e\\ufe0f',
+ rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
+
+ /** Used to compose unicode capture groups. */
+ var rsApos = "['\u2019]",
+ rsAstral = '[' + rsAstralRange + ']',
+ rsBreak = '[' + rsBreakRange + ']',
+ rsCombo = '[' + rsComboRange + ']',
+ rsDigits = '\\d+',
+ rsDingbat = '[' + rsDingbatRange + ']',
+ rsLower = '[' + rsLowerRange + ']',
+ rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
+ rsFitz = '\\ud83c[\\udffb-\\udfff]',
+ rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
+ rsNonAstral = '[^' + rsAstralRange + ']',
+ rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
+ rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
+ rsUpper = '[' + rsUpperRange + ']',
+ rsZWJ = '\\u200d';
+
+ /** Used to compose unicode regexes. */
+ var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
+ rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
+ rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
+ rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
+ reOptMod = rsModifier + '?',
+ rsOptVar = '[' + rsVarRange + ']?',
+ rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
+ rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
+ rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
+ rsSeq = rsOptVar + reOptMod + rsOptJoin,
+ rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
+ rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
+
+ /** Used to match apostrophes. */
+ var reApos = RegExp(rsApos, 'g');
+
+ /**
+ * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
+ * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
+ */
+ var reComboMark = RegExp(rsCombo, 'g');
+
+ /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
+ var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
+
+ /** Used to match complex or compound words. */
+ var reUnicodeWord = RegExp([
+ rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
+ rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
+ rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
+ rsUpper + '+' + rsOptContrUpper,
+ rsOrdUpper,
+ rsOrdLower,
+ rsDigits,
+ rsEmoji
+ ].join('|'), 'g');
+
+ /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
+ var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
+
+ /** Used to detect strings that need a more robust regexp to match words. */
+ var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
+
+ /** Used to assign default `context` object properties. */
+ var contextProps = [
+ 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
+ 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
+ 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
+ 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
+ '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
+ ];
+
+ /** Used to make template sourceURLs easier to identify. */
+ var templateCounter = -1;
+
+ /** Used to identify `toStringTag` values of typed arrays. */
+ var typedArrayTags = {};
+ typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+ typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+ typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+ typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+ typedArrayTags[uint32Tag] = true;
+ typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+ typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+ typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
+ typedArrayTags[errorTag] = typedArrayTags[funcTag] =
+ typedArrayTags[mapTag] = typedArrayTags[numberTag] =
+ typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
+ typedArrayTags[setTag] = typedArrayTags[stringTag] =
+ typedArrayTags[weakMapTag] = false;
+
+ /** Used to identify `toStringTag` values supported by `_.clone`. */
+ var cloneableTags = {};
+ cloneableTags[argsTag] = cloneableTags[arrayTag] =
+ cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
+ cloneableTags[boolTag] = cloneableTags[dateTag] =
+ cloneableTags[float32Tag] = cloneableTags[float64Tag] =
+ cloneableTags[int8Tag] = cloneableTags[int16Tag] =
+ cloneableTags[int32Tag] = cloneableTags[mapTag] =
+ cloneableTags[numberTag] = cloneableTags[objectTag] =
+ cloneableTags[regexpTag] = cloneableTags[setTag] =
+ cloneableTags[stringTag] = cloneableTags[symbolTag] =
+ cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+ cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+ cloneableTags[errorTag] = cloneableTags[funcTag] =
+ cloneableTags[weakMapTag] = false;
+
+ /** Used to map Latin Unicode letters to basic Latin letters. */
+ var deburredLetters = {
+ // Latin-1 Supplement block.
+ '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
+ '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
+ '\xc7': 'C', '\xe7': 'c',
+ '\xd0': 'D', '\xf0': 'd',
+ '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
+ '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
+ '\xcc': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
+ '\xec': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i',
+ '\xd1': 'N', '\xf1': 'n',
+ '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
+ '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
+ '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
+ '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
+ '\xdd': 'Y', '\xfd': 'y', '\xff': 'y',
+ '\xc6': 'Ae', '\xe6': 'ae',
+ '\xde': 'Th', '\xfe': 'th',
+ '\xdf': 'ss',
+ // Latin Extended-A block.
+ '\u0100': 'A', '\u0102': 'A', '\u0104': 'A',
+ '\u0101': 'a', '\u0103': 'a', '\u0105': 'a',
+ '\u0106': 'C', '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
+ '\u0107': 'c', '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
+ '\u010e': 'D', '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
+ '\u0112': 'E', '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
+ '\u0113': 'e', '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
+ '\u011c': 'G', '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
+ '\u011d': 'g', '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
+ '\u0124': 'H', '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
+ '\u0128': 'I', '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
+ '\u0129': 'i', '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
+ '\u0134': 'J', '\u0135': 'j',
+ '\u0136': 'K', '\u0137': 'k', '\u0138': 'k',
+ '\u0139': 'L', '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
+ '\u013a': 'l', '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
+ '\u0143': 'N', '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
+ '\u0144': 'n', '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
+ '\u014c': 'O', '\u014e': 'O', '\u0150': 'O',
+ '\u014d': 'o', '\u014f': 'o', '\u0151': 'o',
+ '\u0154': 'R', '\u0156': 'R', '\u0158': 'R',
+ '\u0155': 'r', '\u0157': 'r', '\u0159': 'r',
+ '\u015a': 'S', '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
+ '\u015b': 's', '\u015d': 's', '\u015f': 's', '\u0161': 's',
+ '\u0162': 'T', '\u0164': 'T', '\u0166': 'T',
+ '\u0163': 't', '\u0165': 't', '\u0167': 't',
+ '\u0168': 'U', '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
+ '\u0169': 'u', '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
+ '\u0174': 'W', '\u0175': 'w',
+ '\u0176': 'Y', '\u0177': 'y', '\u0178': 'Y',
+ '\u0179': 'Z', '\u017b': 'Z', '\u017d': 'Z',
+ '\u017a': 'z', '\u017c': 'z', '\u017e': 'z',
+ '\u0132': 'IJ', '\u0133': 'ij',
+ '\u0152': 'Oe', '\u0153': 'oe',
+ '\u0149': "'n", '\u017f': 's'
+ };
+
+ /** Used to map characters to HTML entities. */
+ var htmlEscapes = {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '"': '"',
+ "'": '''
+ };
+
+ /** Used to map HTML entities to characters. */
+ var htmlUnescapes = {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '"': '"',
+ ''': "'"
+ };
+
+ /** Used to escape characters for inclusion in compiled string literals. */
+ var stringEscapes = {
+ '\\': '\\',
+ "'": "'",
+ '\n': 'n',
+ '\r': 'r',
+ '\u2028': 'u2028',
+ '\u2029': 'u2029'
+ };
+
+ /** Built-in method references without a dependency on `root`. */
+ var freeParseFloat = parseFloat,
+ freeParseInt = parseInt;
+
+ /** Detect free variable `global` from Node.js. */
+ var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
+
+ /** Detect free variable `self`. */
+ var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
+
+ /** Used as a reference to the global object. */
+ var root = freeGlobal || freeSelf || Function('return this')();
+
+ /** Detect free variable `exports`. */
+ var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
+
+ /** Detect free variable `module`. */
+ var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
+
+ /** Detect the popular CommonJS extension `module.exports`. */
+ var moduleExports = freeModule && freeModule.exports === freeExports;
+
+ /** Detect free variable `process` from Node.js. */
+ var freeProcess = moduleExports && freeGlobal.process;
+
+ /** Used to access faster Node.js helpers. */
+ var nodeUtil = (function() {
+ try {
+ // Use `util.types` for Node.js 10+.
+ var types = freeModule && freeModule.require && freeModule.require('util').types;
+
+ if (types) {
+ return types;
+ }
+
+ // Legacy `process.binding('util')` for Node.js < 10.
+ return freeProcess && freeProcess.binding && freeProcess.binding('util');
+ } catch (e) {}
+ }());
+
+ /* Node.js helper references. */
+ var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
+ nodeIsDate = nodeUtil && nodeUtil.isDate,
+ nodeIsMap = nodeUtil && nodeUtil.isMap,
+ nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
+ nodeIsSet = nodeUtil && nodeUtil.isSet,
+ nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * A faster alternative to `Function#apply`, this function invokes `func`
+ * with the `this` binding of `thisArg` and the arguments of `args`.
+ *
+ * @private
+ * @param {Function} func The function to invoke.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {Array} args The arguments to invoke `func` with.
+ * @returns {*} Returns the result of `func`.
+ */
+ function apply(func, thisArg, args) {
+ switch (args.length) {
+ case 0: return func.call(thisArg);
+ case 1: return func.call(thisArg, args[0]);
+ case 2: return func.call(thisArg, args[0], args[1]);
+ case 3: return func.call(thisArg, args[0], args[1], args[2]);
+ }
+ return func.apply(thisArg, args);
+ }
+
+ /**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of `_.forEach` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayEach(array, iteratee) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (iteratee(array[index], index, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.forEachRight` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayEachRight(array, iteratee) {
+ var length = array == null ? 0 : array.length;
+
+ while (length--) {
+ if (iteratee(array[length], length, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.every` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`.
+ */
+ function arrayEvery(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (!predicate(array[index], index, array)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * A specialized version of `_.filter` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function arrayFilter(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result[resIndex++] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.includes` for arrays without support for
+ * specifying an index to search from.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+ function arrayIncludes(array, value) {
+ var length = array == null ? 0 : array.length;
+ return !!length && baseIndexOf(array, value, 0) > -1;
+ }
+
+ /**
+ * This function is like `arrayIncludes` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+ function arrayIncludesWith(array, value, comparator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (comparator(value, array[index])) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of `_.map` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function arrayMap(array, iteratee) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = iteratee(array[index], index, array);
+ }
+ return result;
+ }
+
+ /**
+ * Appends the elements of `values` to `array`.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to append.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayPush(array, values) {
+ var index = -1,
+ length = values.length,
+ offset = array.length;
+
+ while (++index < length) {
+ array[offset + index] = values[index];
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.reduce` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the first element of `array` as
+ * the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduce(array, iteratee, accumulator, initAccum) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ if (initAccum && length) {
+ accumulator = array[++index];
+ }
+ while (++index < length) {
+ accumulator = iteratee(accumulator, array[index], index, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of `_.reduceRight` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the last element of `array` as
+ * the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduceRight(array, iteratee, accumulator, initAccum) {
+ var length = array == null ? 0 : array.length;
+ if (initAccum && length) {
+ accumulator = array[--length];
+ }
+ while (length--) {
+ accumulator = iteratee(accumulator, array[length], length, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of `_.some` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ */
+ function arraySome(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (predicate(array[index], index, array)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Gets the size of an ASCII `string`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+ var asciiSize = baseProperty('length');
+
+ /**
+ * Converts an ASCII `string` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function asciiToArray(string) {
+ return string.split('');
+ }
+
+ /**
+ * Splits an ASCII `string` into an array of its words.
+ *
+ * @private
+ * @param {string} The string to inspect.
+ * @returns {Array} Returns the words of `string`.
+ */
+ function asciiWords(string) {
+ return string.match(reAsciiWord) || [];
+ }
+
+ /**
+ * The base implementation of methods like `_.findKey` and `_.findLastKey`,
+ * without support for iteratee shorthands, which iterates over `collection`
+ * using `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @returns {*} Returns the found element or its key, else `undefined`.
+ */
+ function baseFindKey(collection, predicate, eachFunc) {
+ var result;
+ eachFunc(collection, function(value, key, collection) {
+ if (predicate(value, key, collection)) {
+ result = key;
+ return false;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.findIndex` and `_.findLastIndex` without
+ * support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {number} fromIndex The index to search from.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function baseFindIndex(array, predicate, fromIndex, fromRight) {
+ var length = array.length,
+ index = fromIndex + (fromRight ? 1 : -1);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (predicate(array[index], index, array)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function baseIndexOf(array, value, fromIndex) {
+ return value === value
+ ? strictIndexOf(array, value, fromIndex)
+ : baseFindIndex(array, baseIsNaN, fromIndex);
+ }
+
+ /**
+ * This function is like `baseIndexOf` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function baseIndexOfWith(array, value, fromIndex, comparator) {
+ var index = fromIndex - 1,
+ length = array.length;
+
+ while (++index < length) {
+ if (comparator(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of `_.isNaN` without support for number objects.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+ */
+ function baseIsNaN(value) {
+ return value !== value;
+ }
+
+ /**
+ * The base implementation of `_.mean` and `_.meanBy` without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the mean.
+ */
+ function baseMean(array, iteratee) {
+ var length = array == null ? 0 : array.length;
+ return length ? (baseSum(array, iteratee) / length) : NAN;
+ }
+
+ /**
+ * The base implementation of `_.property` without support for deep paths.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function baseProperty(key) {
+ return function(object) {
+ return object == null ? undefined : object[key];
+ };
+ }
+
+ /**
+ * The base implementation of `_.propertyOf` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function basePropertyOf(object) {
+ return function(key) {
+ return object == null ? undefined : object[key];
+ };
+ }
+
+ /**
+ * The base implementation of `_.reduce` and `_.reduceRight`, without support
+ * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} accumulator The initial value.
+ * @param {boolean} initAccum Specify using the first or last element of
+ * `collection` as the initial value.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @returns {*} Returns the accumulated value.
+ */
+ function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
+ eachFunc(collection, function(value, index, collection) {
+ accumulator = initAccum
+ ? (initAccum = false, value)
+ : iteratee(accumulator, value, index, collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of `_.sortBy` which uses `comparer` to define the
+ * sort order of `array` and replaces criteria objects with their corresponding
+ * values.
+ *
+ * @private
+ * @param {Array} array The array to sort.
+ * @param {Function} comparer The function to define sort order.
+ * @returns {Array} Returns `array`.
+ */
+ function baseSortBy(array, comparer) {
+ var length = array.length;
+
+ array.sort(comparer);
+ while (length--) {
+ array[length] = array[length].value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.sum` and `_.sumBy` without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the sum.
+ */
+ function baseSum(array, iteratee) {
+ var result,
+ index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ var current = iteratee(array[index]);
+ if (current !== undefined) {
+ result = result === undefined ? current : (result + current);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.times` without support for iteratee shorthands
+ * or max array length checks.
+ *
+ * @private
+ * @param {number} n The number of times to invoke `iteratee`.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the array of results.
+ */
+ function baseTimes(n, iteratee) {
+ var index = -1,
+ result = Array(n);
+
+ while (++index < n) {
+ result[index] = iteratee(index);
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
+ * of key-value pairs for `object` corresponding to the property names of `props`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} props The property names to get values for.
+ * @returns {Object} Returns the key-value pairs.
+ */
+ function baseToPairs(object, props) {
+ return arrayMap(props, function(key) {
+ return [key, object[key]];
+ });
+ }
+
+ /**
+ * The base implementation of `_.unary` without support for storing metadata.
+ *
+ * @private
+ * @param {Function} func The function to cap arguments for.
+ * @returns {Function} Returns the new capped function.
+ */
+ function baseUnary(func) {
+ return function(value) {
+ return func(value);
+ };
+ }
+
+ /**
+ * The base implementation of `_.values` and `_.valuesIn` which creates an
+ * array of `object` property values corresponding to the property names
+ * of `props`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} props The property names to get values for.
+ * @returns {Object} Returns the array of property values.
+ */
+ function baseValues(object, props) {
+ return arrayMap(props, function(key) {
+ return object[key];
+ });
+ }
+
+ /**
+ * Checks if a `cache` value for `key` exists.
+ *
+ * @private
+ * @param {Object} cache The cache to query.
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function cacheHas(cache, key) {
+ return cache.has(key);
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
+ * that is not found in the character symbols.
+ *
+ * @private
+ * @param {Array} strSymbols The string symbols to inspect.
+ * @param {Array} chrSymbols The character symbols to find.
+ * @returns {number} Returns the index of the first unmatched string symbol.
+ */
+ function charsStartIndex(strSymbols, chrSymbols) {
+ var index = -1,
+ length = strSymbols.length;
+
+ while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+ return index;
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
+ * that is not found in the character symbols.
+ *
+ * @private
+ * @param {Array} strSymbols The string symbols to inspect.
+ * @param {Array} chrSymbols The character symbols to find.
+ * @returns {number} Returns the index of the last unmatched string symbol.
+ */
+ function charsEndIndex(strSymbols, chrSymbols) {
+ var index = strSymbols.length;
+
+ while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+ return index;
+ }
+
+ /**
+ * Gets the number of `placeholder` occurrences in `array`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} placeholder The placeholder to search for.
+ * @returns {number} Returns the placeholder count.
+ */
+ function countHolders(array, placeholder) {
+ var length = array.length,
+ result = 0;
+
+ while (length--) {
+ if (array[length] === placeholder) {
+ ++result;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
+ * letters to basic Latin letters.
+ *
+ * @private
+ * @param {string} letter The matched letter to deburr.
+ * @returns {string} Returns the deburred letter.
+ */
+ var deburrLetter = basePropertyOf(deburredLetters);
+
+ /**
+ * Used by `_.escape` to convert characters to HTML entities.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ var escapeHtmlChar = basePropertyOf(htmlEscapes);
+
+ /**
+ * Used by `_.template` to escape characters for inclusion in compiled string literals.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ function escapeStringChar(chr) {
+ return '\\' + stringEscapes[chr];
+ }
+
+ /**
+ * Gets the value at `key` of `object`.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {string} key The key of the property to get.
+ * @returns {*} Returns the property value.
+ */
+ function getValue(object, key) {
+ return object == null ? undefined : object[key];
+ }
+
+ /**
+ * Checks if `string` contains Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns `true` if a symbol is found, else `false`.
+ */
+ function hasUnicode(string) {
+ return reHasUnicode.test(string);
+ }
+
+ /**
+ * Checks if `string` contains a word composed of Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns `true` if a word is found, else `false`.
+ */
+ function hasUnicodeWord(string) {
+ return reHasUnicodeWord.test(string);
+ }
+
+ /**
+ * Converts `iterator` to an array.
+ *
+ * @private
+ * @param {Object} iterator The iterator to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function iteratorToArray(iterator) {
+ var data,
+ result = [];
+
+ while (!(data = iterator.next()).done) {
+ result.push(data.value);
+ }
+ return result;
+ }
+
+ /**
+ * Converts `map` to its key-value pairs.
+ *
+ * @private
+ * @param {Object} map The map to convert.
+ * @returns {Array} Returns the key-value pairs.
+ */
+ function mapToArray(map) {
+ var index = -1,
+ result = Array(map.size);
+
+ map.forEach(function(value, key) {
+ result[++index] = [key, value];
+ });
+ return result;
+ }
+
+ /**
+ * Creates a unary function that invokes `func` with its argument transformed.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {Function} transform The argument transform.
+ * @returns {Function} Returns the new function.
+ */
+ function overArg(func, transform) {
+ return function(arg) {
+ return func(transform(arg));
+ };
+ }
+
+ /**
+ * Replaces all `placeholder` elements in `array` with an internal placeholder
+ * and returns an array of their indexes.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {*} placeholder The placeholder to replace.
+ * @returns {Array} Returns the new array of placeholder indexes.
+ */
+ function replaceHolders(array, placeholder) {
+ var index = -1,
+ length = array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value === placeholder || value === PLACEHOLDER) {
+ array[index] = PLACEHOLDER;
+ result[resIndex++] = index;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Converts `set` to an array of its values.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the values.
+ */
+ function setToArray(set) {
+ var index = -1,
+ result = Array(set.size);
+
+ set.forEach(function(value) {
+ result[++index] = value;
+ });
+ return result;
+ }
+
+ /**
+ * Converts `set` to its value-value pairs.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the value-value pairs.
+ */
+ function setToPairs(set) {
+ var index = -1,
+ result = Array(set.size);
+
+ set.forEach(function(value) {
+ result[++index] = [value, value];
+ });
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.indexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function strictIndexOf(array, value, fromIndex) {
+ var index = fromIndex - 1,
+ length = array.length;
+
+ while (++index < length) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * A specialized version of `_.lastIndexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function strictLastIndexOf(array, value, fromIndex) {
+ var index = fromIndex + 1;
+ while (index--) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return index;
+ }
+
+ /**
+ * Gets the number of symbols in `string`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the string size.
+ */
+ function stringSize(string) {
+ return hasUnicode(string)
+ ? unicodeSize(string)
+ : asciiSize(string);
+ }
+
+ /**
+ * Converts `string` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function stringToArray(string) {
+ return hasUnicode(string)
+ ? unicodeToArray(string)
+ : asciiToArray(string);
+ }
+
+ /**
+ * Used by `_.unescape` to convert HTML entities to characters.
+ *
+ * @private
+ * @param {string} chr The matched character to unescape.
+ * @returns {string} Returns the unescaped character.
+ */
+ var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
+
+ /**
+ * Gets the size of a Unicode `string`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+ function unicodeSize(string) {
+ var result = reUnicode.lastIndex = 0;
+ while (reUnicode.test(string)) {
+ ++result;
+ }
+ return result;
+ }
+
+ /**
+ * Converts a Unicode `string` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function unicodeToArray(string) {
+ return string.match(reUnicode) || [];
+ }
+
+ /**
+ * Splits a Unicode `string` into an array of its words.
+ *
+ * @private
+ * @param {string} The string to inspect.
+ * @returns {Array} Returns the words of `string`.
+ */
+ function unicodeWords(string) {
+ return string.match(reUnicodeWord) || [];
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Create a new pristine `lodash` function using the `context` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Util
+ * @param {Object} [context=root] The context object.
+ * @returns {Function} Returns a new `lodash` function.
+ * @example
+ *
+ * _.mixin({ 'foo': _.constant('foo') });
+ *
+ * var lodash = _.runInContext();
+ * lodash.mixin({ 'bar': lodash.constant('bar') });
+ *
+ * _.isFunction(_.foo);
+ * // => true
+ * _.isFunction(_.bar);
+ * // => false
+ *
+ * lodash.isFunction(lodash.foo);
+ * // => false
+ * lodash.isFunction(lodash.bar);
+ * // => true
+ *
+ * // Create a suped-up `defer` in Node.js.
+ * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
+ */
+ var runInContext = (function runInContext(context) {
+ context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
+
+ /** Built-in constructor references. */
+ var Array = context.Array,
+ Date = context.Date,
+ Error = context.Error,
+ Function = context.Function,
+ Math = context.Math,
+ Object = context.Object,
+ RegExp = context.RegExp,
+ String = context.String,
+ TypeError = context.TypeError;
+
+ /** Used for built-in method references. */
+ var arrayProto = Array.prototype,
+ funcProto = Function.prototype,
+ objectProto = Object.prototype;
+
+ /** Used to detect overreaching core-js shims. */
+ var coreJsData = context['__core-js_shared__'];
+
+ /** Used to resolve the decompiled source of functions. */
+ var funcToString = funcProto.toString;
+
+ /** Used to check objects for own properties. */
+ var hasOwnProperty = objectProto.hasOwnProperty;
+
+ /** Used to generate unique IDs. */
+ var idCounter = 0;
+
+ /** Used to detect methods masquerading as native. */
+ var maskSrcKey = (function() {
+ var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
+ return uid ? ('Symbol(src)_1.' + uid) : '';
+ }());
+
+ /**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+ var nativeObjectToString = objectProto.toString;
+
+ /** Used to infer the `Object` constructor. */
+ var objectCtorString = funcToString.call(Object);
+
+ /** Used to restore the original `_` reference in `_.noConflict`. */
+ var oldDash = root._;
+
+ /** Used to detect if a method is native. */
+ var reIsNative = RegExp('^' +
+ funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+ .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+ );
+
+ /** Built-in value references. */
+ var Buffer = moduleExports ? context.Buffer : undefined,
+ Symbol = context.Symbol,
+ Uint8Array = context.Uint8Array,
+ allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
+ getPrototype = overArg(Object.getPrototypeOf, Object),
+ objectCreate = Object.create,
+ propertyIsEnumerable = objectProto.propertyIsEnumerable,
+ splice = arrayProto.splice,
+ spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
+ symIterator = Symbol ? Symbol.iterator : undefined,
+ symToStringTag = Symbol ? Symbol.toStringTag : undefined;
+
+ var defineProperty = (function() {
+ try {
+ var func = getNative(Object, 'defineProperty');
+ func({}, '', {});
+ return func;
+ } catch (e) {}
+ }());
+
+ /** Mocked built-ins. */
+ var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
+ ctxNow = Date && Date.now !== root.Date.now && Date.now,
+ ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
+
+ /* Built-in method references for those with the same name as other `lodash` methods. */
+ var nativeCeil = Math.ceil,
+ nativeFloor = Math.floor,
+ nativeGetSymbols = Object.getOwnPropertySymbols,
+ nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
+ nativeIsFinite = context.isFinite,
+ nativeJoin = arrayProto.join,
+ nativeKeys = overArg(Object.keys, Object),
+ nativeMax = Math.max,
+ nativeMin = Math.min,
+ nativeNow = Date.now,
+ nativeParseInt = context.parseInt,
+ nativeRandom = Math.random,
+ nativeReverse = arrayProto.reverse;
+
+ /* Built-in method references that are verified to be native. */
+ var DataView = getNative(context, 'DataView'),
+ Map = getNative(context, 'Map'),
+ Promise = getNative(context, 'Promise'),
+ Set = getNative(context, 'Set'),
+ WeakMap = getNative(context, 'WeakMap'),
+ nativeCreate = getNative(Object, 'create');
+
+ /** Used to store function metadata. */
+ var metaMap = WeakMap && new WeakMap;
+
+ /** Used to lookup unminified function names. */
+ var realNames = {};
+
+ /** Used to detect maps, sets, and weakmaps. */
+ var dataViewCtorString = toSource(DataView),
+ mapCtorString = toSource(Map),
+ promiseCtorString = toSource(Promise),
+ setCtorString = toSource(Set),
+ weakMapCtorString = toSource(WeakMap);
+
+ /** Used to convert symbols to primitives and strings. */
+ var symbolProto = Symbol ? Symbol.prototype : undefined,
+ symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
+ symbolToString = symbolProto ? symbolProto.toString : undefined;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a `lodash` object which wraps `value` to enable implicit method
+ * chain sequences. Methods that operate on and return arrays, collections,
+ * and functions can be chained together. Methods that retrieve a single value
+ * or may return a primitive value will automatically end the chain sequence
+ * and return the unwrapped value. Otherwise, the value must be unwrapped
+ * with `_#value`.
+ *
+ * Explicit chain sequences, which must be unwrapped with `_#value`, may be
+ * enabled using `_.chain`.
+ *
+ * The execution of chained methods is lazy, that is, it's deferred until
+ * `_#value` is implicitly or explicitly called.
+ *
+ * Lazy evaluation allows several methods to support shortcut fusion.
+ * Shortcut fusion is an optimization to merge iteratee calls; this avoids
+ * the creation of intermediate arrays and can greatly reduce the number of
+ * iteratee executions. Sections of a chain sequence qualify for shortcut
+ * fusion if the section is applied to an array and iteratees accept only
+ * one argument. The heuristic for whether a section qualifies for shortcut
+ * fusion is subject to change.
+ *
+ * Chaining is supported in custom builds as long as the `_#value` method is
+ * directly or indirectly included in the build.
+ *
+ * In addition to lodash methods, wrappers have `Array` and `String` methods.
+ *
+ * The wrapper `Array` methods are:
+ * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
+ *
+ * The wrapper `String` methods are:
+ * `replace` and `split`
+ *
+ * The wrapper methods that support shortcut fusion are:
+ * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
+ * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
+ * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
+ *
+ * The chainable wrapper methods are:
+ * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
+ * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
+ * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
+ * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
+ * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
+ * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
+ * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
+ * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
+ * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
+ * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
+ * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
+ * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
+ * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
+ * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
+ * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
+ * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
+ * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
+ * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
+ * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
+ * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
+ * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
+ * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
+ * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
+ * `zipObject`, `zipObjectDeep`, and `zipWith`
+ *
+ * The wrapper methods that are **not** chainable by default are:
+ * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
+ * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
+ * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
+ * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
+ * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
+ * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
+ * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
+ * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
+ * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
+ * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
+ * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
+ * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
+ * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
+ * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
+ * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
+ * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
+ * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
+ * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
+ * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
+ * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
+ * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
+ * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
+ * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
+ * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
+ * `upperFirst`, `value`, and `words`
+ *
+ * @name _
+ * @constructor
+ * @category Seq
+ * @param {*} value The value to wrap in a `lodash` instance.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var wrapped = _([1, 2, 3]);
+ *
+ * // Returns an unwrapped value.
+ * wrapped.reduce(_.add);
+ * // => 6
+ *
+ * // Returns a wrapped value.
+ * var squares = wrapped.map(square);
+ *
+ * _.isArray(squares);
+ * // => false
+ *
+ * _.isArray(squares.value());
+ * // => true
+ */
+ function lodash(value) {
+ if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
+ if (value instanceof LodashWrapper) {
+ return value;
+ }
+ if (hasOwnProperty.call(value, '__wrapped__')) {
+ return wrapperClone(value);
+ }
+ }
+ return new LodashWrapper(value);
+ }
+
+ /**
+ * The base implementation of `_.create` without support for assigning
+ * properties to the created object.
+ *
+ * @private
+ * @param {Object} proto The object to inherit from.
+ * @returns {Object} Returns the new object.
+ */
+ var baseCreate = (function() {
+ function object() {}
+ return function(proto) {
+ if (!isObject(proto)) {
+ return {};
+ }
+ if (objectCreate) {
+ return objectCreate(proto);
+ }
+ object.prototype = proto;
+ var result = new object;
+ object.prototype = undefined;
+ return result;
+ };
+ }());
+
+ /**
+ * The function whose prototype chain sequence wrappers inherit from.
+ *
+ * @private
+ */
+ function baseLodash() {
+ // No operation performed.
+ }
+
+ /**
+ * The base constructor for creating `lodash` wrapper objects.
+ *
+ * @private
+ * @param {*} value The value to wrap.
+ * @param {boolean} [chainAll] Enable explicit method chain sequences.
+ */
+ function LodashWrapper(value, chainAll) {
+ this.__wrapped__ = value;
+ this.__actions__ = [];
+ this.__chain__ = !!chainAll;
+ this.__index__ = 0;
+ this.__values__ = undefined;
+ }
+
+ /**
+ * By default, the template delimiters used by lodash are like those in
+ * embedded Ruby (ERB) as well as ES2015 template strings. Change the
+ * following template settings to use alternative delimiters.
+ *
+ * @static
+ * @memberOf _
+ * @type {Object}
+ */
+ lodash.templateSettings = {
+
+ /**
+ * Used to detect `data` property values to be HTML-escaped.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'escape': reEscape,
+
+ /**
+ * Used to detect code to be evaluated.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'evaluate': reEvaluate,
+
+ /**
+ * Used to detect `data` property values to inject.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'interpolate': reInterpolate,
+
+ /**
+ * Used to reference the data object in the template text.
+ *
+ * @memberOf _.templateSettings
+ * @type {string}
+ */
+ 'variable': '',
+
+ /**
+ * Used to import variables into the compiled template.
+ *
+ * @memberOf _.templateSettings
+ * @type {Object}
+ */
+ 'imports': {
+
+ /**
+ * A reference to the `lodash` function.
+ *
+ * @memberOf _.templateSettings.imports
+ * @type {Function}
+ */
+ '_': lodash
+ }
+ };
+
+ // Ensure wrappers are instances of `baseLodash`.
+ lodash.prototype = baseLodash.prototype;
+ lodash.prototype.constructor = lodash;
+
+ LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+ LodashWrapper.prototype.constructor = LodashWrapper;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
+ *
+ * @private
+ * @constructor
+ * @param {*} value The value to wrap.
+ */
+ function LazyWrapper(value) {
+ this.__wrapped__ = value;
+ this.__actions__ = [];
+ this.__dir__ = 1;
+ this.__filtered__ = false;
+ this.__iteratees__ = [];
+ this.__takeCount__ = MAX_ARRAY_LENGTH;
+ this.__views__ = [];
+ }
+
+ /**
+ * Creates a clone of the lazy wrapper object.
+ *
+ * @private
+ * @name clone
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the cloned `LazyWrapper` object.
+ */
+ function lazyClone() {
+ var result = new LazyWrapper(this.__wrapped__);
+ result.__actions__ = copyArray(this.__actions__);
+ result.__dir__ = this.__dir__;
+ result.__filtered__ = this.__filtered__;
+ result.__iteratees__ = copyArray(this.__iteratees__);
+ result.__takeCount__ = this.__takeCount__;
+ result.__views__ = copyArray(this.__views__);
+ return result;
+ }
+
+ /**
+ * Reverses the direction of lazy iteration.
+ *
+ * @private
+ * @name reverse
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the new reversed `LazyWrapper` object.
+ */
+ function lazyReverse() {
+ if (this.__filtered__) {
+ var result = new LazyWrapper(this);
+ result.__dir__ = -1;
+ result.__filtered__ = true;
+ } else {
+ result = this.clone();
+ result.__dir__ *= -1;
+ }
+ return result;
+ }
+
+ /**
+ * Extracts the unwrapped value from its lazy wrapper.
+ *
+ * @private
+ * @name value
+ * @memberOf LazyWrapper
+ * @returns {*} Returns the unwrapped value.
+ */
+ function lazyValue() {
+ var array = this.__wrapped__.value(),
+ dir = this.__dir__,
+ isArr = isArray(array),
+ isRight = dir < 0,
+ arrLength = isArr ? array.length : 0,
+ view = getView(0, arrLength, this.__views__),
+ start = view.start,
+ end = view.end,
+ length = end - start,
+ index = isRight ? end : (start - 1),
+ iteratees = this.__iteratees__,
+ iterLength = iteratees.length,
+ resIndex = 0,
+ takeCount = nativeMin(length, this.__takeCount__);
+
+ if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
+ return baseWrapperValue(array, this.__actions__);
+ }
+ var result = [];
+
+ outer:
+ while (length-- && resIndex < takeCount) {
+ index += dir;
+
+ var iterIndex = -1,
+ value = array[index];
+
+ while (++iterIndex < iterLength) {
+ var data = iteratees[iterIndex],
+ iteratee = data.iteratee,
+ type = data.type,
+ computed = iteratee(value);
+
+ if (type == LAZY_MAP_FLAG) {
+ value = computed;
+ } else if (!computed) {
+ if (type == LAZY_FILTER_FLAG) {
+ continue outer;
+ } else {
+ break outer;
+ }
+ }
+ }
+ result[resIndex++] = value;
+ }
+ return result;
+ }
+
+ // Ensure `LazyWrapper` is an instance of `baseLodash`.
+ LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+ LazyWrapper.prototype.constructor = LazyWrapper;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a hash object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function Hash(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the hash.
+ *
+ * @private
+ * @name clear
+ * @memberOf Hash
+ */
+ function hashClear() {
+ this.__data__ = nativeCreate ? nativeCreate(null) : {};
+ this.size = 0;
+ }
+
+ /**
+ * Removes `key` and its value from the hash.
+ *
+ * @private
+ * @name delete
+ * @memberOf Hash
+ * @param {Object} hash The hash to modify.
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+ function hashDelete(key) {
+ var result = this.has(key) && delete this.__data__[key];
+ this.size -= result ? 1 : 0;
+ return result;
+ }
+
+ /**
+ * Gets the hash value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf Hash
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function hashGet(key) {
+ var data = this.__data__;
+ if (nativeCreate) {
+ var result = data[key];
+ return result === HASH_UNDEFINED ? undefined : result;
+ }
+ return hasOwnProperty.call(data, key) ? data[key] : undefined;
+ }
+
+ /**
+ * Checks if a hash value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf Hash
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function hashHas(key) {
+ var data = this.__data__;
+ return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
+ }
+
+ /**
+ * Sets the hash `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf Hash
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the hash instance.
+ */
+ function hashSet(key, value) {
+ var data = this.__data__;
+ this.size += this.has(key) ? 0 : 1;
+ data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+ return this;
+ }
+
+ // Add methods to `Hash`.
+ Hash.prototype.clear = hashClear;
+ Hash.prototype['delete'] = hashDelete;
+ Hash.prototype.get = hashGet;
+ Hash.prototype.has = hashHas;
+ Hash.prototype.set = hashSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an list cache object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function ListCache(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the list cache.
+ *
+ * @private
+ * @name clear
+ * @memberOf ListCache
+ */
+ function listCacheClear() {
+ this.__data__ = [];
+ this.size = 0;
+ }
+
+ /**
+ * Removes `key` and its value from the list cache.
+ *
+ * @private
+ * @name delete
+ * @memberOf ListCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+ function listCacheDelete(key) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ if (index < 0) {
+ return false;
+ }
+ var lastIndex = data.length - 1;
+ if (index == lastIndex) {
+ data.pop();
+ } else {
+ splice.call(data, index, 1);
+ }
+ --this.size;
+ return true;
+ }
+
+ /**
+ * Gets the list cache value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf ListCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function listCacheGet(key) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ return index < 0 ? undefined : data[index][1];
+ }
+
+ /**
+ * Checks if a list cache value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf ListCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function listCacheHas(key) {
+ return assocIndexOf(this.__data__, key) > -1;
+ }
+
+ /**
+ * Sets the list cache `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf ListCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the list cache instance.
+ */
+ function listCacheSet(key, value) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ if (index < 0) {
+ ++this.size;
+ data.push([key, value]);
+ } else {
+ data[index][1] = value;
+ }
+ return this;
+ }
+
+ // Add methods to `ListCache`.
+ ListCache.prototype.clear = listCacheClear;
+ ListCache.prototype['delete'] = listCacheDelete;
+ ListCache.prototype.get = listCacheGet;
+ ListCache.prototype.has = listCacheHas;
+ ListCache.prototype.set = listCacheSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a map cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function MapCache(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the map.
+ *
+ * @private
+ * @name clear
+ * @memberOf MapCache
+ */
+ function mapCacheClear() {
+ this.size = 0;
+ this.__data__ = {
+ 'hash': new Hash,
+ 'map': new (Map || ListCache),
+ 'string': new Hash
+ };
+ }
+
+ /**
+ * Removes `key` and its value from the map.
+ *
+ * @private
+ * @name delete
+ * @memberOf MapCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+ function mapCacheDelete(key) {
+ var result = getMapData(this, key)['delete'](key);
+ this.size -= result ? 1 : 0;
+ return result;
+ }
+
+ /**
+ * Gets the map value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf MapCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function mapCacheGet(key) {
+ return getMapData(this, key).get(key);
+ }
+
+ /**
+ * Checks if a map value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf MapCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function mapCacheHas(key) {
+ return getMapData(this, key).has(key);
+ }
+
+ /**
+ * Sets the map `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf MapCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the map cache instance.
+ */
+ function mapCacheSet(key, value) {
+ var data = getMapData(this, key),
+ size = data.size;
+
+ data.set(key, value);
+ this.size += data.size == size ? 0 : 1;
+ return this;
+ }
+
+ // Add methods to `MapCache`.
+ MapCache.prototype.clear = mapCacheClear;
+ MapCache.prototype['delete'] = mapCacheDelete;
+ MapCache.prototype.get = mapCacheGet;
+ MapCache.prototype.has = mapCacheHas;
+ MapCache.prototype.set = mapCacheSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ *
+ * Creates an array cache object to store unique values.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [values] The values to cache.
+ */
+ function SetCache(values) {
+ var index = -1,
+ length = values == null ? 0 : values.length;
+
+ this.__data__ = new MapCache;
+ while (++index < length) {
+ this.add(values[index]);
+ }
+ }
+
+ /**
+ * Adds `value` to the array cache.
+ *
+ * @private
+ * @name add
+ * @memberOf SetCache
+ * @alias push
+ * @param {*} value The value to cache.
+ * @returns {Object} Returns the cache instance.
+ */
+ function setCacheAdd(value) {
+ this.__data__.set(value, HASH_UNDEFINED);
+ return this;
+ }
+
+ /**
+ * Checks if `value` is in the array cache.
+ *
+ * @private
+ * @name has
+ * @memberOf SetCache
+ * @param {*} value The value to search for.
+ * @returns {number} Returns `true` if `value` is found, else `false`.
+ */
+ function setCacheHas(value) {
+ return this.__data__.has(value);
+ }
+
+ // Add methods to `SetCache`.
+ SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
+ SetCache.prototype.has = setCacheHas;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a stack cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function Stack(entries) {
+ var data = this.__data__ = new ListCache(entries);
+ this.size = data.size;
+ }
+
+ /**
+ * Removes all key-value entries from the stack.
+ *
+ * @private
+ * @name clear
+ * @memberOf Stack
+ */
+ function stackClear() {
+ this.__data__ = new ListCache;
+ this.size = 0;
+ }
+
+ /**
+ * Removes `key` and its value from the stack.
+ *
+ * @private
+ * @name delete
+ * @memberOf Stack
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+ function stackDelete(key) {
+ var data = this.__data__,
+ result = data['delete'](key);
+
+ this.size = data.size;
+ return result;
+ }
+
+ /**
+ * Gets the stack value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf Stack
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function stackGet(key) {
+ return this.__data__.get(key);
+ }
+
+ /**
+ * Checks if a stack value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf Stack
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function stackHas(key) {
+ return this.__data__.has(key);
+ }
+
+ /**
+ * Sets the stack `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf Stack
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the stack cache instance.
+ */
+ function stackSet(key, value) {
+ var data = this.__data__;
+ if (data instanceof ListCache) {
+ var pairs = data.__data__;
+ if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
+ pairs.push([key, value]);
+ this.size = ++data.size;
+ return this;
+ }
+ data = this.__data__ = new MapCache(pairs);
+ }
+ data.set(key, value);
+ this.size = data.size;
+ return this;
+ }
+
+ // Add methods to `Stack`.
+ Stack.prototype.clear = stackClear;
+ Stack.prototype['delete'] = stackDelete;
+ Stack.prototype.get = stackGet;
+ Stack.prototype.has = stackHas;
+ Stack.prototype.set = stackSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of the enumerable property names of the array-like `value`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @param {boolean} inherited Specify returning inherited property names.
+ * @returns {Array} Returns the array of property names.
+ */
+ function arrayLikeKeys(value, inherited) {
+ var isArr = isArray(value),
+ isArg = !isArr && isArguments(value),
+ isBuff = !isArr && !isArg && isBuffer(value),
+ isType = !isArr && !isArg && !isBuff && isTypedArray(value),
+ skipIndexes = isArr || isArg || isBuff || isType,
+ result = skipIndexes ? baseTimes(value.length, String) : [],
+ length = result.length;
+
+ for (var key in value) {
+ if ((inherited || hasOwnProperty.call(value, key)) &&
+ !(skipIndexes && (
+ // Safari 9 has enumerable `arguments.length` in strict mode.
+ key == 'length' ||
+ // Node.js 0.10 has enumerable non-index properties on buffers.
+ (isBuff && (key == 'offset' || key == 'parent')) ||
+ // PhantomJS 2 has enumerable non-index properties on typed arrays.
+ (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
+ // Skip index properties.
+ isIndex(key, length)
+ ))) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.sample` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @returns {*} Returns the random element.
+ */
+ function arraySample(array) {
+ var length = array.length;
+ return length ? array[baseRandom(0, length - 1)] : undefined;
+ }
+
+ /**
+ * A specialized version of `_.sampleSize` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+ function arraySampleSize(array, n) {
+ return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
+ }
+
+ /**
+ * A specialized version of `_.shuffle` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+ function arrayShuffle(array) {
+ return shuffleSelf(copyArray(array));
+ }
+
+ /**
+ * This function is like `assignValue` except that it doesn't assign
+ * `undefined` values.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function assignMergeValue(object, key, value) {
+ if ((value !== undefined && !eq(object[key], value)) ||
+ (value === undefined && !(key in object))) {
+ baseAssignValue(object, key, value);
+ }
+ }
+
+ /**
+ * Assigns `value` to `key` of `object` if the existing value is not equivalent
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function assignValue(object, key, value) {
+ var objValue = object[key];
+ if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
+ (value === undefined && !(key in object))) {
+ baseAssignValue(object, key, value);
+ }
+ }
+
+ /**
+ * Gets the index at which the `key` is found in `array` of key-value pairs.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} key The key to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function assocIndexOf(array, key) {
+ var length = array.length;
+ while (length--) {
+ if (eq(array[length][0], key)) {
+ return length;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of `_.assign` without support for multiple sources
+ * or `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns `object`.
+ */
+ function baseAssign(object, source) {
+ return object && copyObject(source, keys(source), object);
+ }
+
+ /**
+ * The base implementation of `_.assignIn` without support for multiple sources
+ * or `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns `object`.
+ */
+ function baseAssignIn(object, source) {
+ return object && copyObject(source, keysIn(source), object);
+ }
+
+ /**
+ * The base implementation of `assignValue` and `assignMergeValue` without
+ * value checks.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function baseAssignValue(object, key, value) {
+ if (key == '__proto__' && defineProperty) {
+ defineProperty(object, key, {
+ 'configurable': true,
+ 'enumerable': true,
+ 'value': value,
+ 'writable': true
+ });
+ } else {
+ object[key] = value;
+ }
+ }
+
+ /**
+ * The base implementation of `_.at` without support for individual paths.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {string[]} paths The property paths to pick.
+ * @returns {Array} Returns the picked elements.
+ */
+ function baseAt(object, paths) {
+ var index = -1,
+ length = paths.length,
+ result = Array(length),
+ skip = object == null;
+
+ while (++index < length) {
+ result[index] = skip ? undefined : get(object, paths[index]);
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.clamp` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {number} number The number to clamp.
+ * @param {number} [lower] The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the clamped number.
+ */
+ function baseClamp(number, lower, upper) {
+ if (number === number) {
+ if (upper !== undefined) {
+ number = number <= upper ? number : upper;
+ }
+ if (lower !== undefined) {
+ number = number >= lower ? number : lower;
+ }
+ }
+ return number;
+ }
+
+ /**
+ * The base implementation of `_.clone` and `_.cloneDeep` which tracks
+ * traversed objects.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {boolean} bitmask The bitmask flags.
+ * 1 - Deep clone
+ * 2 - Flatten inherited properties
+ * 4 - Clone symbols
+ * @param {Function} [customizer] The function to customize cloning.
+ * @param {string} [key] The key of `value`.
+ * @param {Object} [object] The parent object of `value`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+ function baseClone(value, bitmask, customizer, key, object, stack) {
+ var result,
+ isDeep = bitmask & CLONE_DEEP_FLAG,
+ isFlat = bitmask & CLONE_FLAT_FLAG,
+ isFull = bitmask & CLONE_SYMBOLS_FLAG;
+
+ if (customizer) {
+ result = object ? customizer(value, key, object, stack) : customizer(value);
+ }
+ if (result !== undefined) {
+ return result;
+ }
+ if (!isObject(value)) {
+ return value;
+ }
+ var isArr = isArray(value);
+ if (isArr) {
+ result = initCloneArray(value);
+ if (!isDeep) {
+ return copyArray(value, result);
+ }
+ } else {
+ var tag = getTag(value),
+ isFunc = tag == funcTag || tag == genTag;
+
+ if (isBuffer(value)) {
+ return cloneBuffer(value, isDeep);
+ }
+ if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+ result = (isFlat || isFunc) ? {} : initCloneObject(value);
+ if (!isDeep) {
+ return isFlat
+ ? copySymbolsIn(value, baseAssignIn(result, value))
+ : copySymbols(value, baseAssign(result, value));
+ }
+ } else {
+ if (!cloneableTags[tag]) {
+ return object ? value : {};
+ }
+ result = initCloneByTag(value, tag, isDeep);
+ }
+ }
+ // Check for circular references and return its corresponding clone.
+ stack || (stack = new Stack);
+ var stacked = stack.get(value);
+ if (stacked) {
+ return stacked;
+ }
+ stack.set(value, result);
+
+ if (isSet(value)) {
+ value.forEach(function(subValue) {
+ result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
+ });
+ } else if (isMap(value)) {
+ value.forEach(function(subValue, key) {
+ result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
+ });
+ }
+
+ var keysFunc = isFull
+ ? (isFlat ? getAllKeysIn : getAllKeys)
+ : (isFlat ? keysIn : keys);
+
+ var props = isArr ? undefined : keysFunc(value);
+ arrayEach(props || value, function(subValue, key) {
+ if (props) {
+ key = subValue;
+ subValue = value[key];
+ }
+ // Recursively populate clone (susceptible to call stack limits).
+ assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.conforms` which doesn't clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseConforms(source) {
+ var props = keys(source);
+ return function(object) {
+ return baseConformsTo(object, source, props);
+ };
+ }
+
+ /**
+ * The base implementation of `_.conformsTo` which accepts `props` to check.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+ */
+ function baseConformsTo(object, source, props) {
+ var length = props.length;
+ if (object == null) {
+ return !length;
+ }
+ object = Object(object);
+ while (length--) {
+ var key = props[length],
+ predicate = source[key],
+ value = object[key];
+
+ if ((value === undefined && !(key in object)) || !predicate(value)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * The base implementation of `_.delay` and `_.defer` which accepts `args`
+ * to provide to `func`.
+ *
+ * @private
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {Array} args The arguments to provide to `func`.
+ * @returns {number|Object} Returns the timer id or timeout object.
+ */
+ function baseDelay(func, wait, args) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return setTimeout(function() { func.apply(undefined, args); }, wait);
+ }
+
+ /**
+ * The base implementation of methods like `_.difference` without support
+ * for excluding multiple arrays or iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Array} values The values to exclude.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ */
+ function baseDifference(array, values, iteratee, comparator) {
+ var index = -1,
+ includes = arrayIncludes,
+ isCommon = true,
+ length = array.length,
+ result = [],
+ valuesLength = values.length;
+
+ if (!length) {
+ return result;
+ }
+ if (iteratee) {
+ values = arrayMap(values, baseUnary(iteratee));
+ }
+ if (comparator) {
+ includes = arrayIncludesWith;
+ isCommon = false;
+ }
+ else if (values.length >= LARGE_ARRAY_SIZE) {
+ includes = cacheHas;
+ isCommon = false;
+ values = new SetCache(values);
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee == null ? value : iteratee(value);
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (isCommon && computed === computed) {
+ var valuesIndex = valuesLength;
+ while (valuesIndex--) {
+ if (values[valuesIndex] === computed) {
+ continue outer;
+ }
+ }
+ result.push(value);
+ }
+ else if (!includes(values, computed, comparator)) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.forEach` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+ var baseEach = createBaseEach(baseForOwn);
+
+ /**
+ * The base implementation of `_.forEachRight` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+ var baseEachRight = createBaseEach(baseForOwnRight, true);
+
+ /**
+ * The base implementation of `_.every` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`
+ */
+ function baseEvery(collection, predicate) {
+ var result = true;
+ baseEach(collection, function(value, index, collection) {
+ result = !!predicate(value, index, collection);
+ return result;
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of methods like `_.max` and `_.min` which accepts a
+ * `comparator` to determine the extremum value.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The iteratee invoked per iteration.
+ * @param {Function} comparator The comparator used to compare values.
+ * @returns {*} Returns the extremum value.
+ */
+ function baseExtremum(array, iteratee, comparator) {
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ var value = array[index],
+ current = iteratee(value);
+
+ if (current != null && (computed === undefined
+ ? (current === current && !isSymbol(current))
+ : comparator(current, computed)
+ )) {
+ var computed = current,
+ result = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.fill` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ */
+ function baseFill(array, value, start, end) {
+ var length = array.length;
+
+ start = toInteger(start);
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = (end === undefined || end > length) ? length : toInteger(end);
+ if (end < 0) {
+ end += length;
+ }
+ end = start > end ? 0 : toLength(end);
+ while (start < end) {
+ array[start++] = value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.filter` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function baseFilter(collection, predicate) {
+ var result = [];
+ baseEach(collection, function(value, index, collection) {
+ if (predicate(value, index, collection)) {
+ result.push(value);
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.flatten` with support for restricting flattening.
+ *
+ * @private
+ * @param {Array} array The array to flatten.
+ * @param {number} depth The maximum recursion depth.
+ * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
+ * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
+ * @param {Array} [result=[]] The initial result value.
+ * @returns {Array} Returns the new flattened array.
+ */
+ function baseFlatten(array, depth, predicate, isStrict, result) {
+ var index = -1,
+ length = array.length;
+
+ predicate || (predicate = isFlattenable);
+ result || (result = []);
+
+ while (++index < length) {
+ var value = array[index];
+ if (depth > 0 && predicate(value)) {
+ if (depth > 1) {
+ // Recursively flatten arrays (susceptible to call stack limits).
+ baseFlatten(value, depth - 1, predicate, isStrict, result);
+ } else {
+ arrayPush(result, value);
+ }
+ } else if (!isStrict) {
+ result[result.length] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `baseForOwn` which iterates over `object`
+ * properties returned by `keysFunc` and invokes `iteratee` for each property.
+ * Iteratee functions may exit iteration early by explicitly returning `false`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+ var baseFor = createBaseFor();
+
+ /**
+ * This function is like `baseFor` except that it iterates over properties
+ * in the opposite order.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+ var baseForRight = createBaseFor(true);
+
+ /**
+ * The base implementation of `_.forOwn` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+ function baseForOwn(object, iteratee) {
+ return object && baseFor(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+ function baseForOwnRight(object, iteratee) {
+ return object && baseForRight(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of `_.functions` which creates an array of
+ * `object` function property names filtered from `props`.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} props The property names to filter.
+ * @returns {Array} Returns the function names.
+ */
+ function baseFunctions(object, props) {
+ return arrayFilter(props, function(key) {
+ return isFunction(object[key]);
+ });
+ }
+
+ /**
+ * The base implementation of `_.get` without support for default values.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseGet(object, path) {
+ path = castPath(path, object);
+
+ var index = 0,
+ length = path.length;
+
+ while (object != null && index < length) {
+ object = object[toKey(path[index++])];
+ }
+ return (index && index == length) ? object : undefined;
+ }
+
+ /**
+ * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
+ * `keysFunc` and `symbolsFunc` to get the enumerable property names and
+ * symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @param {Function} symbolsFunc The function to get the symbols of `object`.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function baseGetAllKeys(object, keysFunc, symbolsFunc) {
+ var result = keysFunc(object);
+ return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
+ }
+
+ /**
+ * The base implementation of `getTag` without fallbacks for buggy environments.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ */
+ function baseGetTag(value) {
+ if (value == null) {
+ return value === undefined ? undefinedTag : nullTag;
+ }
+ return (symToStringTag && symToStringTag in Object(value))
+ ? getRawTag(value)
+ : objectToString(value);
+ }
+
+ /**
+ * The base implementation of `_.gt` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is greater than `other`,
+ * else `false`.
+ */
+ function baseGt(value, other) {
+ return value > other;
+ }
+
+ /**
+ * The base implementation of `_.has` without support for deep paths.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns `true` if `key` exists, else `false`.
+ */
+ function baseHas(object, key) {
+ return object != null && hasOwnProperty.call(object, key);
+ }
+
+ /**
+ * The base implementation of `_.hasIn` without support for deep paths.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns `true` if `key` exists, else `false`.
+ */
+ function baseHasIn(object, key) {
+ return object != null && key in Object(object);
+ }
+
+ /**
+ * The base implementation of `_.inRange` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {number} number The number to check.
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
+ */
+ function baseInRange(number, start, end) {
+ return number >= nativeMin(start, end) && number < nativeMax(start, end);
+ }
+
+ /**
+ * The base implementation of methods like `_.intersection`, without support
+ * for iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of shared values.
+ */
+ function baseIntersection(arrays, iteratee, comparator) {
+ var includes = comparator ? arrayIncludesWith : arrayIncludes,
+ length = arrays[0].length,
+ othLength = arrays.length,
+ othIndex = othLength,
+ caches = Array(othLength),
+ maxLength = Infinity,
+ result = [];
+
+ while (othIndex--) {
+ var array = arrays[othIndex];
+ if (othIndex && iteratee) {
+ array = arrayMap(array, baseUnary(iteratee));
+ }
+ maxLength = nativeMin(array.length, maxLength);
+ caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
+ ? new SetCache(othIndex && array)
+ : undefined;
+ }
+ array = arrays[0];
+
+ var index = -1,
+ seen = caches[0];
+
+ outer:
+ while (++index < length && result.length < maxLength) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (!(seen
+ ? cacheHas(seen, computed)
+ : includes(result, computed, comparator)
+ )) {
+ othIndex = othLength;
+ while (--othIndex) {
+ var cache = caches[othIndex];
+ if (!(cache
+ ? cacheHas(cache, computed)
+ : includes(arrays[othIndex], computed, comparator))
+ ) {
+ continue outer;
+ }
+ }
+ if (seen) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.invert` and `_.invertBy` which inverts
+ * `object` with values transformed by `iteratee` and set by `setter`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform values.
+ * @param {Object} accumulator The initial inverted object.
+ * @returns {Function} Returns `accumulator`.
+ */
+ function baseInverter(object, setter, iteratee, accumulator) {
+ baseForOwn(object, function(value, key, object) {
+ setter(accumulator, iteratee(value), key, object);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of `_.invoke` without support for individual
+ * method arguments.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {Array} args The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ */
+ function baseInvoke(object, path, args) {
+ path = castPath(path, object);
+ object = parent(object, path);
+ var func = object == null ? object : object[toKey(last(path))];
+ return func == null ? undefined : apply(func, object, args);
+ }
+
+ /**
+ * The base implementation of `_.isArguments`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an `arguments` object,
+ */
+ function baseIsArguments(value) {
+ return isObjectLike(value) && baseGetTag(value) == argsTag;
+ }
+
+ /**
+ * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
+ */
+ function baseIsArrayBuffer(value) {
+ return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
+ }
+
+ /**
+ * The base implementation of `_.isDate` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+ */
+ function baseIsDate(value) {
+ return isObjectLike(value) && baseGetTag(value) == dateTag;
+ }
+
+ /**
+ * The base implementation of `_.isEqual` which supports partial comparisons
+ * and tracks traversed objects.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {boolean} bitmask The bitmask flags.
+ * 1 - Unordered comparison
+ * 2 - Partial comparison
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {Object} [stack] Tracks traversed `value` and `other` objects.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ */
+ function baseIsEqual(value, other, bitmask, customizer, stack) {
+ if (value === other) {
+ return true;
+ }
+ if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
+ return value !== value && other !== other;
+ }
+ return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
+ }
+
+ /**
+ * A specialized version of `baseIsEqual` for arrays and objects which performs
+ * deep comparisons and tracks traversed objects enabling objects with circular
+ * references to be compared.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} [stack] Tracks traversed `object` and `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
+ var objIsArr = isArray(object),
+ othIsArr = isArray(other),
+ objTag = objIsArr ? arrayTag : getTag(object),
+ othTag = othIsArr ? arrayTag : getTag(other);
+
+ objTag = objTag == argsTag ? objectTag : objTag;
+ othTag = othTag == argsTag ? objectTag : othTag;
+
+ var objIsObj = objTag == objectTag,
+ othIsObj = othTag == objectTag,
+ isSameTag = objTag == othTag;
+
+ if (isSameTag && isBuffer(object)) {
+ if (!isBuffer(other)) {
+ return false;
+ }
+ objIsArr = true;
+ objIsObj = false;
+ }
+ if (isSameTag && !objIsObj) {
+ stack || (stack = new Stack);
+ return (objIsArr || isTypedArray(object))
+ ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
+ : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
+ }
+ if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
+ var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
+ othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
+
+ if (objIsWrapped || othIsWrapped) {
+ var objUnwrapped = objIsWrapped ? object.value() : object,
+ othUnwrapped = othIsWrapped ? other.value() : other;
+
+ stack || (stack = new Stack);
+ return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
+ }
+ }
+ if (!isSameTag) {
+ return false;
+ }
+ stack || (stack = new Stack);
+ return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
+ }
+
+ /**
+ * The base implementation of `_.isMap` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a map, else `false`.
+ */
+ function baseIsMap(value) {
+ return isObjectLike(value) && getTag(value) == mapTag;
+ }
+
+ /**
+ * The base implementation of `_.isMatch` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property values to match.
+ * @param {Array} matchData The property names, values, and compare flags to match.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+ */
+ function baseIsMatch(object, source, matchData, customizer) {
+ var index = matchData.length,
+ length = index,
+ noCustomizer = !customizer;
+
+ if (object == null) {
+ return !length;
+ }
+ object = Object(object);
+ while (index--) {
+ var data = matchData[index];
+ if ((noCustomizer && data[2])
+ ? data[1] !== object[data[0]]
+ : !(data[0] in object)
+ ) {
+ return false;
+ }
+ }
+ while (++index < length) {
+ data = matchData[index];
+ var key = data[0],
+ objValue = object[key],
+ srcValue = data[1];
+
+ if (noCustomizer && data[2]) {
+ if (objValue === undefined && !(key in object)) {
+ return false;
+ }
+ } else {
+ var stack = new Stack;
+ if (customizer) {
+ var result = customizer(objValue, srcValue, key, object, source, stack);
+ }
+ if (!(result === undefined
+ ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
+ : result
+ )) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ /**
+ * The base implementation of `_.isNative` without bad shim checks.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a native function,
+ * else `false`.
+ */
+ function baseIsNative(value) {
+ if (!isObject(value) || isMasked(value)) {
+ return false;
+ }
+ var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
+ return pattern.test(toSource(value));
+ }
+
+ /**
+ * The base implementation of `_.isRegExp` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+ */
+ function baseIsRegExp(value) {
+ return isObjectLike(value) && baseGetTag(value) == regexpTag;
+ }
+
+ /**
+ * The base implementation of `_.isSet` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a set, else `false`.
+ */
+ function baseIsSet(value) {
+ return isObjectLike(value) && getTag(value) == setTag;
+ }
+
+ /**
+ * The base implementation of `_.isTypedArray` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
+ */
+ function baseIsTypedArray(value) {
+ return isObjectLike(value) &&
+ isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
+ }
+
+ /**
+ * The base implementation of `_.iteratee`.
+ *
+ * @private
+ * @param {*} [value=_.identity] The value to convert to an iteratee.
+ * @returns {Function} Returns the iteratee.
+ */
+ function baseIteratee(value) {
+ // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
+ // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
+ if (typeof value == 'function') {
+ return value;
+ }
+ if (value == null) {
+ return identity;
+ }
+ if (typeof value == 'object') {
+ return isArray(value)
+ ? baseMatchesProperty(value[0], value[1])
+ : baseMatches(value);
+ }
+ return property(value);
+ }
+
+ /**
+ * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function baseKeys(object) {
+ if (!isPrototype(object)) {
+ return nativeKeys(object);
+ }
+ var result = [];
+ for (var key in Object(object)) {
+ if (hasOwnProperty.call(object, key) && key != 'constructor') {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function baseKeysIn(object) {
+ if (!isObject(object)) {
+ return nativeKeysIn(object);
+ }
+ var isProto = isPrototype(object),
+ result = [];
+
+ for (var key in object) {
+ if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.lt` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is less than `other`,
+ * else `false`.
+ */
+ function baseLt(value, other) {
+ return value < other;
+ }
+
+ /**
+ * The base implementation of `_.map` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function baseMap(collection, iteratee) {
+ var index = -1,
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value, key, collection) {
+ result[++index] = iteratee(value, key, collection);
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.matches` which doesn't clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property values to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseMatches(source) {
+ var matchData = getMatchData(source);
+ if (matchData.length == 1 && matchData[0][2]) {
+ return matchesStrictComparable(matchData[0][0], matchData[0][1]);
+ }
+ return function(object) {
+ return object === source || baseIsMatch(object, source, matchData);
+ };
+ }
+
+ /**
+ * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
+ *
+ * @private
+ * @param {string} path The path of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseMatchesProperty(path, srcValue) {
+ if (isKey(path) && isStrictComparable(srcValue)) {
+ return matchesStrictComparable(toKey(path), srcValue);
+ }
+ return function(object) {
+ var objValue = get(object, path);
+ return (objValue === undefined && objValue === srcValue)
+ ? hasIn(object, path)
+ : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
+ };
+ }
+
+ /**
+ * The base implementation of `_.merge` without support for multiple sources.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {number} srcIndex The index of `source`.
+ * @param {Function} [customizer] The function to customize merged values.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ */
+ function baseMerge(object, source, srcIndex, customizer, stack) {
+ if (object === source) {
+ return;
+ }
+ baseFor(source, function(srcValue, key) {
+ stack || (stack = new Stack);
+ if (isObject(srcValue)) {
+ baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
+ }
+ else {
+ var newValue = customizer
+ ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
+ : undefined;
+
+ if (newValue === undefined) {
+ newValue = srcValue;
+ }
+ assignMergeValue(object, key, newValue);
+ }
+ }, keysIn);
+ }
+
+ /**
+ * A specialized version of `baseMerge` for arrays and objects which performs
+ * deep merges and tracks traversed objects enabling objects with circular
+ * references to be merged.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {string} key The key of the value to merge.
+ * @param {number} srcIndex The index of `source`.
+ * @param {Function} mergeFunc The function to merge values.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ */
+ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
+ var objValue = safeGet(object, key),
+ srcValue = safeGet(source, key),
+ stacked = stack.get(srcValue);
+
+ if (stacked) {
+ assignMergeValue(object, key, stacked);
+ return;
+ }
+ var newValue = customizer
+ ? customizer(objValue, srcValue, (key + ''), object, source, stack)
+ : undefined;
+
+ var isCommon = newValue === undefined;
+
+ if (isCommon) {
+ var isArr = isArray(srcValue),
+ isBuff = !isArr && isBuffer(srcValue),
+ isTyped = !isArr && !isBuff && isTypedArray(srcValue);
+
+ newValue = srcValue;
+ if (isArr || isBuff || isTyped) {
+ if (isArray(objValue)) {
+ newValue = objValue;
+ }
+ else if (isArrayLikeObject(objValue)) {
+ newValue = copyArray(objValue);
+ }
+ else if (isBuff) {
+ isCommon = false;
+ newValue = cloneBuffer(srcValue, true);
+ }
+ else if (isTyped) {
+ isCommon = false;
+ newValue = cloneTypedArray(srcValue, true);
+ }
+ else {
+ newValue = [];
+ }
+ }
+ else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+ newValue = objValue;
+ if (isArguments(objValue)) {
+ newValue = toPlainObject(objValue);
+ }
+ else if (!isObject(objValue) || isFunction(objValue)) {
+ newValue = initCloneObject(srcValue);
+ }
+ }
+ else {
+ isCommon = false;
+ }
+ }
+ if (isCommon) {
+ // Recursively merge objects and arrays (susceptible to call stack limits).
+ stack.set(srcValue, newValue);
+ mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+ stack['delete'](srcValue);
+ }
+ assignMergeValue(object, key, newValue);
+ }
+
+ /**
+ * The base implementation of `_.nth` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {number} n The index of the element to return.
+ * @returns {*} Returns the nth element of `array`.
+ */
+ function baseNth(array, n) {
+ var length = array.length;
+ if (!length) {
+ return;
+ }
+ n += n < 0 ? length : 0;
+ return isIndex(n, length) ? array[n] : undefined;
+ }
+
+ /**
+ * The base implementation of `_.orderBy` without param guards.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+ * @param {string[]} orders The sort orders of `iteratees`.
+ * @returns {Array} Returns the new sorted array.
+ */
+ function baseOrderBy(collection, iteratees, orders) {
+ if (iteratees.length) {
+ iteratees = arrayMap(iteratees, function(iteratee) {
+ if (isArray(iteratee)) {
+ return function(value) {
+ return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
+ }
+ }
+ return iteratee;
+ });
+ } else {
+ iteratees = [identity];
+ }
+
+ var index = -1;
+ iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
+
+ var result = baseMap(collection, function(value, key, collection) {
+ var criteria = arrayMap(iteratees, function(iteratee) {
+ return iteratee(value);
+ });
+ return { 'criteria': criteria, 'index': ++index, 'value': value };
+ });
+
+ return baseSortBy(result, function(object, other) {
+ return compareMultiple(object, other, orders);
+ });
+ }
+
+ /**
+ * The base implementation of `_.pick` without support for individual
+ * property identifiers.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} paths The property paths to pick.
+ * @returns {Object} Returns the new object.
+ */
+ function basePick(object, paths) {
+ return basePickBy(object, paths, function(value, path) {
+ return hasIn(object, path);
+ });
+ }
+
+ /**
+ * The base implementation of `_.pickBy` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} paths The property paths to pick.
+ * @param {Function} predicate The function invoked per property.
+ * @returns {Object} Returns the new object.
+ */
+ function basePickBy(object, paths, predicate) {
+ var index = -1,
+ length = paths.length,
+ result = {};
+
+ while (++index < length) {
+ var path = paths[index],
+ value = baseGet(object, path);
+
+ if (predicate(value, path)) {
+ baseSet(result, castPath(path, object), value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `baseProperty` which supports deep paths.
+ *
+ * @private
+ * @param {Array|string} path The path of the property to get.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function basePropertyDeep(path) {
+ return function(object) {
+ return baseGet(object, path);
+ };
+ }
+
+ /**
+ * The base implementation of `_.pullAllBy` without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns `array`.
+ */
+ function basePullAll(array, values, iteratee, comparator) {
+ var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
+ index = -1,
+ length = values.length,
+ seen = array;
+
+ if (array === values) {
+ values = copyArray(values);
+ }
+ if (iteratee) {
+ seen = arrayMap(array, baseUnary(iteratee));
+ }
+ while (++index < length) {
+ var fromIndex = 0,
+ value = values[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
+ if (seen !== array) {
+ splice.call(seen, fromIndex, 1);
+ }
+ splice.call(array, fromIndex, 1);
+ }
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.pullAt` without support for individual
+ * indexes or capturing the removed elements.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {number[]} indexes The indexes of elements to remove.
+ * @returns {Array} Returns `array`.
+ */
+ function basePullAt(array, indexes) {
+ var length = array ? indexes.length : 0,
+ lastIndex = length - 1;
+
+ while (length--) {
+ var index = indexes[length];
+ if (length == lastIndex || index !== previous) {
+ var previous = index;
+ if (isIndex(index)) {
+ splice.call(array, index, 1);
+ } else {
+ baseUnset(array, index);
+ }
+ }
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.random` without support for returning
+ * floating-point numbers.
+ *
+ * @private
+ * @param {number} lower The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the random number.
+ */
+ function baseRandom(lower, upper) {
+ return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
+ }
+
+ /**
+ * The base implementation of `_.range` and `_.rangeRight` which doesn't
+ * coerce arguments.
+ *
+ * @private
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @param {number} step The value to increment or decrement by.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the range of numbers.
+ */
+ function baseRange(start, end, step, fromRight) {
+ var index = -1,
+ length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+ result = Array(length);
+
+ while (length--) {
+ result[fromRight ? length : ++index] = start;
+ start += step;
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.repeat` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {string} string The string to repeat.
+ * @param {number} n The number of times to repeat the string.
+ * @returns {string} Returns the repeated string.
+ */
+ function baseRepeat(string, n) {
+ var result = '';
+ if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
+ return result;
+ }
+ // Leverage the exponentiation by squaring algorithm for a faster repeat.
+ // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
+ do {
+ if (n % 2) {
+ result += string;
+ }
+ n = nativeFloor(n / 2);
+ if (n) {
+ string += string;
+ }
+ } while (n);
+
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.rest` which doesn't validate or coerce arguments.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ */
+ function baseRest(func, start) {
+ return setToString(overRest(func, start, identity), func + '');
+ }
+
+ /**
+ * The base implementation of `_.sample`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to sample.
+ * @returns {*} Returns the random element.
+ */
+ function baseSample(collection) {
+ return arraySample(values(collection));
+ }
+
+ /**
+ * The base implementation of `_.sampleSize` without param guards.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+ function baseSampleSize(collection, n) {
+ var array = values(collection);
+ return shuffleSelf(array, baseClamp(n, 0, array.length));
+ }
+
+ /**
+ * The base implementation of `_.set`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns `object`.
+ */
+ function baseSet(object, path, value, customizer) {
+ if (!isObject(object)) {
+ return object;
+ }
+ path = castPath(path, object);
+
+ var index = -1,
+ length = path.length,
+ lastIndex = length - 1,
+ nested = object;
+
+ while (nested != null && ++index < length) {
+ var key = toKey(path[index]),
+ newValue = value;
+
+ if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
+ return object;
+ }
+
+ if (index != lastIndex) {
+ var objValue = nested[key];
+ newValue = customizer ? customizer(objValue, key, nested) : undefined;
+ if (newValue === undefined) {
+ newValue = isObject(objValue)
+ ? objValue
+ : (isIndex(path[index + 1]) ? [] : {});
+ }
+ }
+ assignValue(nested, key, newValue);
+ nested = nested[key];
+ }
+ return object;
+ }
+
+ /**
+ * The base implementation of `setData` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns `func`.
+ */
+ var baseSetData = !metaMap ? identity : function(func, data) {
+ metaMap.set(func, data);
+ return func;
+ };
+
+ /**
+ * The base implementation of `setToString` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+ var baseSetToString = !defineProperty ? identity : function(func, string) {
+ return defineProperty(func, 'toString', {
+ 'configurable': true,
+ 'enumerable': false,
+ 'value': constant(string),
+ 'writable': true
+ });
+ };
+
+ /**
+ * The base implementation of `_.shuffle`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+ function baseShuffle(collection) {
+ return shuffleSelf(values(collection));
+ }
+
+ /**
+ * The base implementation of `_.slice` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function baseSlice(array, start, end) {
+ var index = -1,
+ length = array.length;
+
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = end > length ? length : end;
+ if (end < 0) {
+ end += length;
+ }
+ length = start > end ? 0 : ((end - start) >>> 0);
+ start >>>= 0;
+
+ var result = Array(length);
+ while (++index < length) {
+ result[index] = array[index + start];
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.some` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ */
+ function baseSome(collection, predicate) {
+ var result;
+
+ baseEach(collection, function(value, index, collection) {
+ result = predicate(value, index, collection);
+ return !result;
+ });
+ return !!result;
+ }
+
+ /**
+ * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
+ * performs a binary search of `array` to determine the index at which `value`
+ * should be inserted into `array` in order to maintain its sort order.
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ */
+ function baseSortedIndex(array, value, retHighest) {
+ var low = 0,
+ high = array == null ? low : array.length;
+
+ if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
+ while (low < high) {
+ var mid = (low + high) >>> 1,
+ computed = array[mid];
+
+ if (computed !== null && !isSymbol(computed) &&
+ (retHighest ? (computed <= value) : (computed < value))) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return high;
+ }
+ return baseSortedIndexBy(array, value, identity, retHighest);
+ }
+
+ /**
+ * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
+ * which invokes `iteratee` for `value` and each element of `array` to compute
+ * their sort ranking. The iteratee is invoked with one argument; (value).
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} iteratee The iteratee invoked per element.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ */
+ function baseSortedIndexBy(array, value, iteratee, retHighest) {
+ var low = 0,
+ high = array == null ? 0 : array.length;
+ if (high === 0) {
+ return 0;
+ }
+
+ value = iteratee(value);
+ var valIsNaN = value !== value,
+ valIsNull = value === null,
+ valIsSymbol = isSymbol(value),
+ valIsUndefined = value === undefined;
+
+ while (low < high) {
+ var mid = nativeFloor((low + high) / 2),
+ computed = iteratee(array[mid]),
+ othIsDefined = computed !== undefined,
+ othIsNull = computed === null,
+ othIsReflexive = computed === computed,
+ othIsSymbol = isSymbol(computed);
+
+ if (valIsNaN) {
+ var setLow = retHighest || othIsReflexive;
+ } else if (valIsUndefined) {
+ setLow = othIsReflexive && (retHighest || othIsDefined);
+ } else if (valIsNull) {
+ setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
+ } else if (valIsSymbol) {
+ setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
+ } else if (othIsNull || othIsSymbol) {
+ setLow = false;
+ } else {
+ setLow = retHighest ? (computed <= value) : (computed < value);
+ }
+ if (setLow) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return nativeMin(high, MAX_ARRAY_INDEX);
+ }
+
+ /**
+ * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
+ * support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+ function baseSortedUniq(array, iteratee) {
+ var index = -1,
+ length = array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ if (!index || !eq(computed, seen)) {
+ var seen = computed;
+ result[resIndex++] = value === 0 ? 0 : value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.toNumber` which doesn't ensure correct
+ * conversions of binary, hexadecimal, or octal string values.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {number} Returns the number.
+ */
+ function baseToNumber(value) {
+ if (typeof value == 'number') {
+ return value;
+ }
+ if (isSymbol(value)) {
+ return NAN;
+ }
+ return +value;
+ }
+
+ /**
+ * The base implementation of `_.toString` which doesn't convert nullish
+ * values to empty strings.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {string} Returns the string.
+ */
+ function baseToString(value) {
+ // Exit early for strings to avoid a performance hit in some environments.
+ if (typeof value == 'string') {
+ return value;
+ }
+ if (isArray(value)) {
+ // Recursively convert values (susceptible to call stack limits).
+ return arrayMap(value, baseToString) + '';
+ }
+ if (isSymbol(value)) {
+ return symbolToString ? symbolToString.call(value) : '';
+ }
+ var result = (value + '');
+ return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+ }
+
+ /**
+ * The base implementation of `_.uniqBy` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+ function baseUniq(array, iteratee, comparator) {
+ var index = -1,
+ includes = arrayIncludes,
+ length = array.length,
+ isCommon = true,
+ result = [],
+ seen = result;
+
+ if (comparator) {
+ isCommon = false;
+ includes = arrayIncludesWith;
+ }
+ else if (length >= LARGE_ARRAY_SIZE) {
+ var set = iteratee ? null : createSet(array);
+ if (set) {
+ return setToArray(set);
+ }
+ isCommon = false;
+ includes = cacheHas;
+ seen = new SetCache;
+ }
+ else {
+ seen = iteratee ? [] : result;
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (isCommon && computed === computed) {
+ var seenIndex = seen.length;
+ while (seenIndex--) {
+ if (seen[seenIndex] === computed) {
+ continue outer;
+ }
+ }
+ if (iteratee) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ else if (!includes(seen, computed, comparator)) {
+ if (seen !== result) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.unset`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The property path to unset.
+ * @returns {boolean} Returns `true` if the property is deleted, else `false`.
+ */
+ function baseUnset(object, path) {
+ path = castPath(path, object);
+ object = parent(object, path);
+ return object == null || delete object[toKey(last(path))];
+ }
+
+ /**
+ * The base implementation of `_.update`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to update.
+ * @param {Function} updater The function to produce the updated value.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns `object`.
+ */
+ function baseUpdate(object, path, updater, customizer) {
+ return baseSet(object, path, updater(baseGet(object, path)), customizer);
+ }
+
+ /**
+ * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
+ * without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function baseWhile(array, predicate, isDrop, fromRight) {
+ var length = array.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length) &&
+ predicate(array[index], index, array)) {}
+
+ return isDrop
+ ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
+ : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
+ }
+
+ /**
+ * The base implementation of `wrapperValue` which returns the result of
+ * performing a sequence of actions on the unwrapped `value`, where each
+ * successive action is supplied the return value of the previous.
+ *
+ * @private
+ * @param {*} value The unwrapped value.
+ * @param {Array} actions Actions to perform to resolve the unwrapped value.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseWrapperValue(value, actions) {
+ var result = value;
+ if (result instanceof LazyWrapper) {
+ result = result.value();
+ }
+ return arrayReduce(actions, function(result, action) {
+ return action.func.apply(action.thisArg, arrayPush([result], action.args));
+ }, result);
+ }
+
+ /**
+ * The base implementation of methods like `_.xor`, without support for
+ * iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of values.
+ */
+ function baseXor(arrays, iteratee, comparator) {
+ var length = arrays.length;
+ if (length < 2) {
+ return length ? baseUniq(arrays[0]) : [];
+ }
+ var index = -1,
+ result = Array(length);
+
+ while (++index < length) {
+ var array = arrays[index],
+ othIndex = -1;
+
+ while (++othIndex < length) {
+ if (othIndex != index) {
+ result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
+ }
+ }
+ }
+ return baseUniq(baseFlatten(result, 1), iteratee, comparator);
+ }
+
+ /**
+ * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
+ *
+ * @private
+ * @param {Array} props The property identifiers.
+ * @param {Array} values The property values.
+ * @param {Function} assignFunc The function to assign values.
+ * @returns {Object} Returns the new object.
+ */
+ function baseZipObject(props, values, assignFunc) {
+ var index = -1,
+ length = props.length,
+ valsLength = values.length,
+ result = {};
+
+ while (++index < length) {
+ var value = index < valsLength ? values[index] : undefined;
+ assignFunc(result, props[index], value);
+ }
+ return result;
+ }
+
+ /**
+ * Casts `value` to an empty array if it's not an array like object.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array|Object} Returns the cast array-like object.
+ */
+ function castArrayLikeObject(value) {
+ return isArrayLikeObject(value) ? value : [];
+ }
+
+ /**
+ * Casts `value` to `identity` if it's not a function.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Function} Returns cast function.
+ */
+ function castFunction(value) {
+ return typeof value == 'function' ? value : identity;
+ }
+
+ /**
+ * Casts `value` to a path array if it's not one.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @param {Object} [object] The object to query keys on.
+ * @returns {Array} Returns the cast property path array.
+ */
+ function castPath(value, object) {
+ if (isArray(value)) {
+ return value;
+ }
+ return isKey(value, object) ? [value] : stringToPath(toString(value));
+ }
+
+ /**
+ * A `baseRest` alias which can be replaced with `identity` by module
+ * replacement plugins.
+ *
+ * @private
+ * @type {Function}
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+ var castRest = baseRest;
+
+ /**
+ * Casts `array` to a slice if it's needed.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {number} start The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the cast slice.
+ */
+ function castSlice(array, start, end) {
+ var length = array.length;
+ end = end === undefined ? length : end;
+ return (!start && end >= length) ? array : baseSlice(array, start, end);
+ }
+
+ /**
+ * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
+ *
+ * @private
+ * @param {number|Object} id The timer id or timeout object of the timer to clear.
+ */
+ var clearTimeout = ctxClearTimeout || function(id) {
+ return root.clearTimeout(id);
+ };
+
+ /**
+ * Creates a clone of `buffer`.
+ *
+ * @private
+ * @param {Buffer} buffer The buffer to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Buffer} Returns the cloned buffer.
+ */
+ function cloneBuffer(buffer, isDeep) {
+ if (isDeep) {
+ return buffer.slice();
+ }
+ var length = buffer.length,
+ result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
+
+ buffer.copy(result);
+ return result;
+ }
+
+ /**
+ * Creates a clone of `arrayBuffer`.
+ *
+ * @private
+ * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+ * @returns {ArrayBuffer} Returns the cloned array buffer.
+ */
+ function cloneArrayBuffer(arrayBuffer) {
+ var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
+ new Uint8Array(result).set(new Uint8Array(arrayBuffer));
+ return result;
+ }
+
+ /**
+ * Creates a clone of `dataView`.
+ *
+ * @private
+ * @param {Object} dataView The data view to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the cloned data view.
+ */
+ function cloneDataView(dataView, isDeep) {
+ var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
+ return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
+ }
+
+ /**
+ * Creates a clone of `regexp`.
+ *
+ * @private
+ * @param {Object} regexp The regexp to clone.
+ * @returns {Object} Returns the cloned regexp.
+ */
+ function cloneRegExp(regexp) {
+ var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
+ result.lastIndex = regexp.lastIndex;
+ return result;
+ }
+
+ /**
+ * Creates a clone of the `symbol` object.
+ *
+ * @private
+ * @param {Object} symbol The symbol object to clone.
+ * @returns {Object} Returns the cloned symbol object.
+ */
+ function cloneSymbol(symbol) {
+ return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
+ }
+
+ /**
+ * Creates a clone of `typedArray`.
+ *
+ * @private
+ * @param {Object} typedArray The typed array to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the cloned typed array.
+ */
+ function cloneTypedArray(typedArray, isDeep) {
+ var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
+ return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
+ }
+
+ /**
+ * Compares values to sort them in ascending order.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {number} Returns the sort order indicator for `value`.
+ */
+ function compareAscending(value, other) {
+ if (value !== other) {
+ var valIsDefined = value !== undefined,
+ valIsNull = value === null,
+ valIsReflexive = value === value,
+ valIsSymbol = isSymbol(value);
+
+ var othIsDefined = other !== undefined,
+ othIsNull = other === null,
+ othIsReflexive = other === other,
+ othIsSymbol = isSymbol(other);
+
+ if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
+ (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
+ (valIsNull && othIsDefined && othIsReflexive) ||
+ (!valIsDefined && othIsReflexive) ||
+ !valIsReflexive) {
+ return 1;
+ }
+ if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
+ (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
+ (othIsNull && valIsDefined && valIsReflexive) ||
+ (!othIsDefined && valIsReflexive) ||
+ !othIsReflexive) {
+ return -1;
+ }
+ }
+ return 0;
+ }
+
+ /**
+ * Used by `_.orderBy` to compare multiple properties of a value to another
+ * and stable sort them.
+ *
+ * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
+ * specify an order of "desc" for descending or "asc" for ascending sort order
+ * of corresponding values.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {boolean[]|string[]} orders The order to sort by for each property.
+ * @returns {number} Returns the sort order indicator for `object`.
+ */
+ function compareMultiple(object, other, orders) {
+ var index = -1,
+ objCriteria = object.criteria,
+ othCriteria = other.criteria,
+ length = objCriteria.length,
+ ordersLength = orders.length;
+
+ while (++index < length) {
+ var result = compareAscending(objCriteria[index], othCriteria[index]);
+ if (result) {
+ if (index >= ordersLength) {
+ return result;
+ }
+ var order = orders[index];
+ return result * (order == 'desc' ? -1 : 1);
+ }
+ }
+ // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+ // that causes it, under certain circumstances, to provide the same value for
+ // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
+ // for more details.
+ //
+ // This also ensures a stable sort in V8 and other engines.
+ // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
+ return object.index - other.index;
+ }
+
+ /**
+ * Creates an array that is the composition of partially applied arguments,
+ * placeholders, and provided arguments into a single array of arguments.
+ *
+ * @private
+ * @param {Array} args The provided arguments.
+ * @param {Array} partials The arguments to prepend to those provided.
+ * @param {Array} holders The `partials` placeholder indexes.
+ * @params {boolean} [isCurried] Specify composing for a curried function.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgs(args, partials, holders, isCurried) {
+ var argsIndex = -1,
+ argsLength = args.length,
+ holdersLength = holders.length,
+ leftIndex = -1,
+ leftLength = partials.length,
+ rangeLength = nativeMax(argsLength - holdersLength, 0),
+ result = Array(leftLength + rangeLength),
+ isUncurried = !isCurried;
+
+ while (++leftIndex < leftLength) {
+ result[leftIndex] = partials[leftIndex];
+ }
+ while (++argsIndex < holdersLength) {
+ if (isUncurried || argsIndex < argsLength) {
+ result[holders[argsIndex]] = args[argsIndex];
+ }
+ }
+ while (rangeLength--) {
+ result[leftIndex++] = args[argsIndex++];
+ }
+ return result;
+ }
+
+ /**
+ * This function is like `composeArgs` except that the arguments composition
+ * is tailored for `_.partialRight`.
+ *
+ * @private
+ * @param {Array} args The provided arguments.
+ * @param {Array} partials The arguments to append to those provided.
+ * @param {Array} holders The `partials` placeholder indexes.
+ * @params {boolean} [isCurried] Specify composing for a curried function.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgsRight(args, partials, holders, isCurried) {
+ var argsIndex = -1,
+ argsLength = args.length,
+ holdersIndex = -1,
+ holdersLength = holders.length,
+ rightIndex = -1,
+ rightLength = partials.length,
+ rangeLength = nativeMax(argsLength - holdersLength, 0),
+ result = Array(rangeLength + rightLength),
+ isUncurried = !isCurried;
+
+ while (++argsIndex < rangeLength) {
+ result[argsIndex] = args[argsIndex];
+ }
+ var offset = argsIndex;
+ while (++rightIndex < rightLength) {
+ result[offset + rightIndex] = partials[rightIndex];
+ }
+ while (++holdersIndex < holdersLength) {
+ if (isUncurried || argsIndex < argsLength) {
+ result[offset + holders[holdersIndex]] = args[argsIndex++];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Copies the values of `source` to `array`.
+ *
+ * @private
+ * @param {Array} source The array to copy values from.
+ * @param {Array} [array=[]] The array to copy values to.
+ * @returns {Array} Returns `array`.
+ */
+ function copyArray(source, array) {
+ var index = -1,
+ length = source.length;
+
+ array || (array = Array(length));
+ while (++index < length) {
+ array[index] = source[index];
+ }
+ return array;
+ }
+
+ /**
+ * Copies properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property identifiers to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @param {Function} [customizer] The function to customize copied values.
+ * @returns {Object} Returns `object`.
+ */
+ function copyObject(source, props, object, customizer) {
+ var isNew = !object;
+ object || (object = {});
+
+ var index = -1,
+ length = props.length;
+
+ while (++index < length) {
+ var key = props[index];
+
+ var newValue = customizer
+ ? customizer(object[key], source[key], key, object, source)
+ : undefined;
+
+ if (newValue === undefined) {
+ newValue = source[key];
+ }
+ if (isNew) {
+ baseAssignValue(object, key, newValue);
+ } else {
+ assignValue(object, key, newValue);
+ }
+ }
+ return object;
+ }
+
+ /**
+ * Copies own symbols of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns `object`.
+ */
+ function copySymbols(source, object) {
+ return copyObject(source, getSymbols(source), object);
+ }
+
+ /**
+ * Copies own and inherited symbols of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns `object`.
+ */
+ function copySymbolsIn(source, object) {
+ return copyObject(source, getSymbolsIn(source), object);
+ }
+
+ /**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, getIteratee(iteratee, 2), accumulator);
+ };
+ }
+
+ /**
+ * Creates a function like `_.assign`.
+ *
+ * @private
+ * @param {Function} assigner The function to assign values.
+ * @returns {Function} Returns the new assigner function.
+ */
+ function createAssigner(assigner) {
+ return baseRest(function(object, sources) {
+ var index = -1,
+ length = sources.length,
+ customizer = length > 1 ? sources[length - 1] : undefined,
+ guard = length > 2 ? sources[2] : undefined;
+
+ customizer = (assigner.length > 3 && typeof customizer == 'function')
+ ? (length--, customizer)
+ : undefined;
+
+ if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+ customizer = length < 3 ? undefined : customizer;
+ length = 1;
+ }
+ object = Object(object);
+ while (++index < length) {
+ var source = sources[index];
+ if (source) {
+ assigner(object, source, index, customizer);
+ }
+ }
+ return object;
+ });
+ }
+
+ /**
+ * Creates a `baseEach` or `baseEachRight` function.
+ *
+ * @private
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseEach(eachFunc, fromRight) {
+ return function(collection, iteratee) {
+ if (collection == null) {
+ return collection;
+ }
+ if (!isArrayLike(collection)) {
+ return eachFunc(collection, iteratee);
+ }
+ var length = collection.length,
+ index = fromRight ? length : -1,
+ iterable = Object(collection);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (iteratee(iterable[index], index, iterable) === false) {
+ break;
+ }
+ }
+ return collection;
+ };
+ }
+
+ /**
+ * Creates a base function for methods like `_.forIn` and `_.forOwn`.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseFor(fromRight) {
+ return function(object, iteratee, keysFunc) {
+ var index = -1,
+ iterable = Object(object),
+ props = keysFunc(object),
+ length = props.length;
+
+ while (length--) {
+ var key = props[fromRight ? length : ++index];
+ if (iteratee(iterable[key], key, iterable) === false) {
+ break;
+ }
+ }
+ return object;
+ };
+ }
+
+ /**
+ * Creates a function that wraps `func` to invoke it with the optional `this`
+ * binding of `thisArg`.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createBind(func, bitmask, thisArg) {
+ var isBind = bitmask & WRAP_BIND_FLAG,
+ Ctor = createCtor(func);
+
+ function wrapper() {
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return fn.apply(isBind ? thisArg : this, arguments);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a function like `_.lowerFirst`.
+ *
+ * @private
+ * @param {string} methodName The name of the `String` case method to use.
+ * @returns {Function} Returns the new case function.
+ */
+ function createCaseFirst(methodName) {
+ return function(string) {
+ string = toString(string);
+
+ var strSymbols = hasUnicode(string)
+ ? stringToArray(string)
+ : undefined;
+
+ var chr = strSymbols
+ ? strSymbols[0]
+ : string.charAt(0);
+
+ var trailing = strSymbols
+ ? castSlice(strSymbols, 1).join('')
+ : string.slice(1);
+
+ return chr[methodName]() + trailing;
+ };
+ }
+
+ /**
+ * Creates a function like `_.camelCase`.
+ *
+ * @private
+ * @param {Function} callback The function to combine each word.
+ * @returns {Function} Returns the new compounder function.
+ */
+ function createCompounder(callback) {
+ return function(string) {
+ return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
+ };
+ }
+
+ /**
+ * Creates a function that produces an instance of `Ctor` regardless of
+ * whether it was invoked as part of a `new` expression or by `call` or `apply`.
+ *
+ * @private
+ * @param {Function} Ctor The constructor to wrap.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createCtor(Ctor) {
+ return function() {
+ // Use a `switch` statement to work with class constructors. See
+ // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
+ // for more details.
+ var args = arguments;
+ switch (args.length) {
+ case 0: return new Ctor;
+ case 1: return new Ctor(args[0]);
+ case 2: return new Ctor(args[0], args[1]);
+ case 3: return new Ctor(args[0], args[1], args[2]);
+ case 4: return new Ctor(args[0], args[1], args[2], args[3]);
+ case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
+ case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
+ case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+ }
+ var thisBinding = baseCreate(Ctor.prototype),
+ result = Ctor.apply(thisBinding, args);
+
+ // Mimic the constructor's `return` behavior.
+ // See https://es5.github.io/#x13.2.2 for more details.
+ return isObject(result) ? result : thisBinding;
+ };
+ }
+
+ /**
+ * Creates a function that wraps `func` to enable currying.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @param {number} arity The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createCurry(func, bitmask, arity) {
+ var Ctor = createCtor(func);
+
+ function wrapper() {
+ var length = arguments.length,
+ args = Array(length),
+ index = length,
+ placeholder = getHolder(wrapper);
+
+ while (index--) {
+ args[index] = arguments[index];
+ }
+ var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
+ ? []
+ : replaceHolders(args, placeholder);
+
+ length -= holders.length;
+ if (length < arity) {
+ return createRecurry(
+ func, bitmask, createHybrid, wrapper.placeholder, undefined,
+ args, holders, undefined, undefined, arity - length);
+ }
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return apply(fn, this, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a `_.find` or `_.findLast` function.
+ *
+ * @private
+ * @param {Function} findIndexFunc The function to find the collection index.
+ * @returns {Function} Returns the new find function.
+ */
+ function createFind(findIndexFunc) {
+ return function(collection, predicate, fromIndex) {
+ var iterable = Object(collection);
+ if (!isArrayLike(collection)) {
+ var iteratee = getIteratee(predicate, 3);
+ collection = keys(collection);
+ predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+ }
+ var index = findIndexFunc(collection, predicate, fromIndex);
+ return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+ };
+ }
+
+ /**
+ * Creates a `_.flow` or `_.flowRight` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new flow function.
+ */
+ function createFlow(fromRight) {
+ return flatRest(function(funcs) {
+ var length = funcs.length,
+ index = length,
+ prereq = LodashWrapper.prototype.thru;
+
+ if (fromRight) {
+ funcs.reverse();
+ }
+ while (index--) {
+ var func = funcs[index];
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
+ var wrapper = new LodashWrapper([], true);
+ }
+ }
+ index = wrapper ? index : length;
+ while (++index < length) {
+ func = funcs[index];
+
+ var funcName = getFuncName(func),
+ data = funcName == 'wrapper' ? getData(func) : undefined;
+
+ if (data && isLaziable(data[0]) &&
+ data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
+ !data[4].length && data[9] == 1
+ ) {
+ wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
+ } else {
+ wrapper = (func.length == 1 && isLaziable(func))
+ ? wrapper[funcName]()
+ : wrapper.thru(func);
+ }
+ }
+ return function() {
+ var args = arguments,
+ value = args[0];
+
+ if (wrapper && args.length == 1 && isArray(value)) {
+ return wrapper.plant(value).value();
+ }
+ var index = 0,
+ result = length ? funcs[index].apply(this, args) : value;
+
+ while (++index < length) {
+ result = funcs[index].call(this, result);
+ }
+ return result;
+ };
+ });
+ }
+
+ /**
+ * Creates a function that wraps `func` to invoke it with optional `this`
+ * binding of `thisArg`, partial application, and currying.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to wrap.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {Array} [partials] The arguments to prepend to those provided to
+ * the new function.
+ * @param {Array} [holders] The `partials` placeholder indexes.
+ * @param {Array} [partialsRight] The arguments to append to those provided
+ * to the new function.
+ * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of `func`.
+ * @param {number} [arity] The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+ var isAry = bitmask & WRAP_ARY_FLAG,
+ isBind = bitmask & WRAP_BIND_FLAG,
+ isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
+ isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
+ isFlip = bitmask & WRAP_FLIP_FLAG,
+ Ctor = isBindKey ? undefined : createCtor(func);
+
+ function wrapper() {
+ var length = arguments.length,
+ args = Array(length),
+ index = length;
+
+ while (index--) {
+ args[index] = arguments[index];
+ }
+ if (isCurried) {
+ var placeholder = getHolder(wrapper),
+ holdersCount = countHolders(args, placeholder);
+ }
+ if (partials) {
+ args = composeArgs(args, partials, holders, isCurried);
+ }
+ if (partialsRight) {
+ args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
+ }
+ length -= holdersCount;
+ if (isCurried && length < arity) {
+ var newHolders = replaceHolders(args, placeholder);
+ return createRecurry(
+ func, bitmask, createHybrid, wrapper.placeholder, thisArg,
+ args, newHolders, argPos, ary, arity - length
+ );
+ }
+ var thisBinding = isBind ? thisArg : this,
+ fn = isBindKey ? thisBinding[func] : func;
+
+ length = args.length;
+ if (argPos) {
+ args = reorder(args, argPos);
+ } else if (isFlip && length > 1) {
+ args.reverse();
+ }
+ if (isAry && ary < length) {
+ args.length = ary;
+ }
+ if (this && this !== root && this instanceof wrapper) {
+ fn = Ctor || createCtor(fn);
+ }
+ return fn.apply(thisBinding, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a function like `_.invertBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} toIteratee The function to resolve iteratees.
+ * @returns {Function} Returns the new inverter function.
+ */
+ function createInverter(setter, toIteratee) {
+ return function(object, iteratee) {
+ return baseInverter(object, setter, toIteratee(iteratee), {});
+ };
+ }
+
+ /**
+ * Creates a function that performs a mathematical operation on two values.
+ *
+ * @private
+ * @param {Function} operator The function to perform the operation.
+ * @param {number} [defaultValue] The value used for `undefined` arguments.
+ * @returns {Function} Returns the new mathematical operation function.
+ */
+ function createMathOperation(operator, defaultValue) {
+ return function(value, other) {
+ var result;
+ if (value === undefined && other === undefined) {
+ return defaultValue;
+ }
+ if (value !== undefined) {
+ result = value;
+ }
+ if (other !== undefined) {
+ if (result === undefined) {
+ return other;
+ }
+ if (typeof value == 'string' || typeof other == 'string') {
+ value = baseToString(value);
+ other = baseToString(other);
+ } else {
+ value = baseToNumber(value);
+ other = baseToNumber(other);
+ }
+ result = operator(value, other);
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function like `_.over`.
+ *
+ * @private
+ * @param {Function} arrayFunc The function to iterate over iteratees.
+ * @returns {Function} Returns the new over function.
+ */
+ function createOver(arrayFunc) {
+ return flatRest(function(iteratees) {
+ iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
+ return baseRest(function(args) {
+ var thisArg = this;
+ return arrayFunc(iteratees, function(iteratee) {
+ return apply(iteratee, thisArg, args);
+ });
+ });
+ });
+ }
+
+ /**
+ * Creates the padding for `string` based on `length`. The `chars` string
+ * is truncated if the number of characters exceeds `length`.
+ *
+ * @private
+ * @param {number} length The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padding for `string`.
+ */
+ function createPadding(length, chars) {
+ chars = chars === undefined ? ' ' : baseToString(chars);
+
+ var charsLength = chars.length;
+ if (charsLength < 2) {
+ return charsLength ? baseRepeat(chars, length) : chars;
+ }
+ var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
+ return hasUnicode(chars)
+ ? castSlice(stringToArray(result), 0, length).join('')
+ : result.slice(0, length);
+ }
+
+ /**
+ * Creates a function that wraps `func` to invoke it with the `this` binding
+ * of `thisArg` and `partials` prepended to the arguments it receives.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {Array} partials The arguments to prepend to those provided to
+ * the new function.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createPartial(func, bitmask, thisArg, partials) {
+ var isBind = bitmask & WRAP_BIND_FLAG,
+ Ctor = createCtor(func);
+
+ function wrapper() {
+ var argsIndex = -1,
+ argsLength = arguments.length,
+ leftIndex = -1,
+ leftLength = partials.length,
+ args = Array(leftLength + argsLength),
+ fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+
+ while (++leftIndex < leftLength) {
+ args[leftIndex] = partials[leftIndex];
+ }
+ while (argsLength--) {
+ args[leftIndex++] = arguments[++argsIndex];
+ }
+ return apply(fn, isBind ? thisArg : this, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a `_.range` or `_.rangeRight` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new range function.
+ */
+ function createRange(fromRight) {
+ return function(start, end, step) {
+ if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
+ end = step = undefined;
+ }
+ // Ensure the sign of `-0` is preserved.
+ start = toFinite(start);
+ if (end === undefined) {
+ end = start;
+ start = 0;
+ } else {
+ end = toFinite(end);
+ }
+ step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
+ return baseRange(start, end, step, fromRight);
+ };
+ }
+
+ /**
+ * Creates a function that performs a relational operation on two values.
+ *
+ * @private
+ * @param {Function} operator The function to perform the operation.
+ * @returns {Function} Returns the new relational operation function.
+ */
+ function createRelationalOperation(operator) {
+ return function(value, other) {
+ if (!(typeof value == 'string' && typeof other == 'string')) {
+ value = toNumber(value);
+ other = toNumber(other);
+ }
+ return operator(value, other);
+ };
+ }
+
+ /**
+ * Creates a function that wraps `func` to continue currying.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @param {Function} wrapFunc The function to create the `func` wrapper.
+ * @param {*} placeholder The placeholder value.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {Array} [partials] The arguments to prepend to those provided to
+ * the new function.
+ * @param {Array} [holders] The `partials` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of `func`.
+ * @param {number} [arity] The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
+ var isCurry = bitmask & WRAP_CURRY_FLAG,
+ newHolders = isCurry ? holders : undefined,
+ newHoldersRight = isCurry ? undefined : holders,
+ newPartials = isCurry ? partials : undefined,
+ newPartialsRight = isCurry ? undefined : partials;
+
+ bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
+ bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
+
+ if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
+ bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
+ }
+ var newData = [
+ func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
+ newHoldersRight, argPos, ary, arity
+ ];
+
+ var result = wrapFunc.apply(undefined, newData);
+ if (isLaziable(func)) {
+ setData(result, newData);
+ }
+ result.placeholder = placeholder;
+ return setWrapToString(result, func, bitmask);
+ }
+
+ /**
+ * Creates a function like `_.round`.
+ *
+ * @private
+ * @param {string} methodName The name of the `Math` method to use when rounding.
+ * @returns {Function} Returns the new round function.
+ */
+ function createRound(methodName) {
+ var func = Math[methodName];
+ return function(number, precision) {
+ number = toNumber(number);
+ precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
+ if (precision && nativeIsFinite(number)) {
+ // Shift with exponential notation to avoid floating-point issues.
+ // See [MDN](https://mdn.io/round#Examples) for more details.
+ var pair = (toString(number) + 'e').split('e'),
+ value = func(pair[0] + 'e' + (+pair[1] + precision));
+
+ pair = (toString(value) + 'e').split('e');
+ return +(pair[0] + 'e' + (+pair[1] - precision));
+ }
+ return func(number);
+ };
+ }
+
+ /**
+ * Creates a set object of `values`.
+ *
+ * @private
+ * @param {Array} values The values to add to the set.
+ * @returns {Object} Returns the new set.
+ */
+ var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
+ return new Set(values);
+ };
+
+ /**
+ * Creates a `_.toPairs` or `_.toPairsIn` function.
+ *
+ * @private
+ * @param {Function} keysFunc The function to get the keys of a given object.
+ * @returns {Function} Returns the new pairs function.
+ */
+ function createToPairs(keysFunc) {
+ return function(object) {
+ var tag = getTag(object);
+ if (tag == mapTag) {
+ return mapToArray(object);
+ }
+ if (tag == setTag) {
+ return setToPairs(object);
+ }
+ return baseToPairs(object, keysFunc(object));
+ };
+ }
+
+ /**
+ * Creates a function that either curries or invokes `func` with optional
+ * `this` binding and partially applied arguments.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to wrap.
+ * @param {number} bitmask The bitmask flags.
+ * 1 - `_.bind`
+ * 2 - `_.bindKey`
+ * 4 - `_.curry` or `_.curryRight` of a bound function
+ * 8 - `_.curry`
+ * 16 - `_.curryRight`
+ * 32 - `_.partial`
+ * 64 - `_.partialRight`
+ * 128 - `_.rearg`
+ * 256 - `_.ary`
+ * 512 - `_.flip`
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {Array} [partials] The arguments to be partially applied.
+ * @param {Array} [holders] The `partials` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of `func`.
+ * @param {number} [arity] The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+ var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
+ if (!isBindKey && typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var length = partials ? partials.length : 0;
+ if (!length) {
+ bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
+ partials = holders = undefined;
+ }
+ ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
+ arity = arity === undefined ? arity : toInteger(arity);
+ length -= holders ? holders.length : 0;
+
+ if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
+ var partialsRight = partials,
+ holdersRight = holders;
+
+ partials = holders = undefined;
+ }
+ var data = isBindKey ? undefined : getData(func);
+
+ var newData = [
+ func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
+ argPos, ary, arity
+ ];
+
+ if (data) {
+ mergeData(newData, data);
+ }
+ func = newData[0];
+ bitmask = newData[1];
+ thisArg = newData[2];
+ partials = newData[3];
+ holders = newData[4];
+ arity = newData[9] = newData[9] === undefined
+ ? (isBindKey ? 0 : func.length)
+ : nativeMax(newData[9] - length, 0);
+
+ if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
+ bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
+ }
+ if (!bitmask || bitmask == WRAP_BIND_FLAG) {
+ var result = createBind(func, bitmask, thisArg);
+ } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
+ result = createCurry(func, bitmask, arity);
+ } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
+ result = createPartial(func, bitmask, thisArg, partials);
+ } else {
+ result = createHybrid.apply(undefined, newData);
+ }
+ var setter = data ? baseSetData : setData;
+ return setWrapToString(setter(result, newData), func, bitmask);
+ }
+
+ /**
+ * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
+ * of source objects to the destination object for all destination properties
+ * that resolve to `undefined`.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to assign.
+ * @param {Object} object The parent object of `objValue`.
+ * @returns {*} Returns the value to assign.
+ */
+ function customDefaultsAssignIn(objValue, srcValue, key, object) {
+ if (objValue === undefined ||
+ (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+ return srcValue;
+ }
+ return objValue;
+ }
+
+ /**
+ * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
+ * objects into destination objects that are passed thru.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to merge.
+ * @param {Object} object The parent object of `objValue`.
+ * @param {Object} source The parent object of `srcValue`.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ * @returns {*} Returns the value to assign.
+ */
+ function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
+ if (isObject(objValue) && isObject(srcValue)) {
+ // Recursively merge objects and arrays (susceptible to call stack limits).
+ stack.set(srcValue, objValue);
+ baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
+ stack['delete'](srcValue);
+ }
+ return objValue;
+ }
+
+ /**
+ * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
+ * objects.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @param {string} key The key of the property to inspect.
+ * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
+ */
+ function customOmitClone(value) {
+ return isPlainObject(value) ? undefined : value;
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for arrays with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Array} array The array to compare.
+ * @param {Array} other The other array to compare.
+ * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed `array` and `other` objects.
+ * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
+ */
+ function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+ arrLength = array.length,
+ othLength = other.length;
+
+ if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
+ return false;
+ }
+ // Check that cyclic values are equal.
+ var arrStacked = stack.get(array);
+ var othStacked = stack.get(other);
+ if (arrStacked && othStacked) {
+ return arrStacked == other && othStacked == array;
+ }
+ var index = -1,
+ result = true,
+ seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
+
+ stack.set(array, other);
+ stack.set(other, array);
+
+ // Ignore non-index properties.
+ while (++index < arrLength) {
+ var arrValue = array[index],
+ othValue = other[index];
+
+ if (customizer) {
+ var compared = isPartial
+ ? customizer(othValue, arrValue, index, other, array, stack)
+ : customizer(arrValue, othValue, index, array, other, stack);
+ }
+ if (compared !== undefined) {
+ if (compared) {
+ continue;
+ }
+ result = false;
+ break;
+ }
+ // Recursively compare arrays (susceptible to call stack limits).
+ if (seen) {
+ if (!arraySome(other, function(othValue, othIndex) {
+ if (!cacheHas(seen, othIndex) &&
+ (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
+ return seen.push(othIndex);
+ }
+ })) {
+ result = false;
+ break;
+ }
+ } else if (!(
+ arrValue === othValue ||
+ equalFunc(arrValue, othValue, bitmask, customizer, stack)
+ )) {
+ result = false;
+ break;
+ }
+ }
+ stack['delete'](array);
+ stack['delete'](other);
+ return result;
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for comparing objects of
+ * the same `toStringTag`.
+ *
+ * **Note:** This function only supports comparing values with tags of
+ * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {string} tag The `toStringTag` of the objects to compare.
+ * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed `object` and `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
+ switch (tag) {
+ case dataViewTag:
+ if ((object.byteLength != other.byteLength) ||
+ (object.byteOffset != other.byteOffset)) {
+ return false;
+ }
+ object = object.buffer;
+ other = other.buffer;
+
+ case arrayBufferTag:
+ if ((object.byteLength != other.byteLength) ||
+ !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
+ return false;
+ }
+ return true;
+
+ case boolTag:
+ case dateTag:
+ case numberTag:
+ // Coerce booleans to `1` or `0` and dates to milliseconds.
+ // Invalid dates are coerced to `NaN`.
+ return eq(+object, +other);
+
+ case errorTag:
+ return object.name == other.name && object.message == other.message;
+
+ case regexpTag:
+ case stringTag:
+ // Coerce regexes to strings and treat strings, primitives and objects,
+ // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
+ // for more details.
+ return object == (other + '');
+
+ case mapTag:
+ var convert = mapToArray;
+
+ case setTag:
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
+ convert || (convert = setToArray);
+
+ if (object.size != other.size && !isPartial) {
+ return false;
+ }
+ // Assume cyclic values are equal.
+ var stacked = stack.get(object);
+ if (stacked) {
+ return stacked == other;
+ }
+ bitmask |= COMPARE_UNORDERED_FLAG;
+
+ // Recursively compare objects (susceptible to call stack limits).
+ stack.set(object, other);
+ var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
+ stack['delete'](object);
+ return result;
+
+ case symbolTag:
+ if (symbolValueOf) {
+ return symbolValueOf.call(object) == symbolValueOf.call(other);
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for objects with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed `object` and `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+ objProps = getAllKeys(object),
+ objLength = objProps.length,
+ othProps = getAllKeys(other),
+ othLength = othProps.length;
+
+ if (objLength != othLength && !isPartial) {
+ return false;
+ }
+ var index = objLength;
+ while (index--) {
+ var key = objProps[index];
+ if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
+ return false;
+ }
+ }
+ // Check that cyclic values are equal.
+ var objStacked = stack.get(object);
+ var othStacked = stack.get(other);
+ if (objStacked && othStacked) {
+ return objStacked == other && othStacked == object;
+ }
+ var result = true;
+ stack.set(object, other);
+ stack.set(other, object);
+
+ var skipCtor = isPartial;
+ while (++index < objLength) {
+ key = objProps[index];
+ var objValue = object[key],
+ othValue = other[key];
+
+ if (customizer) {
+ var compared = isPartial
+ ? customizer(othValue, objValue, key, other, object, stack)
+ : customizer(objValue, othValue, key, object, other, stack);
+ }
+ // Recursively compare objects (susceptible to call stack limits).
+ if (!(compared === undefined
+ ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
+ : compared
+ )) {
+ result = false;
+ break;
+ }
+ skipCtor || (skipCtor = key == 'constructor');
+ }
+ if (result && !skipCtor) {
+ var objCtor = object.constructor,
+ othCtor = other.constructor;
+
+ // Non `Object` object instances with different constructors are not equal.
+ if (objCtor != othCtor &&
+ ('constructor' in object && 'constructor' in other) &&
+ !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
+ typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+ result = false;
+ }
+ }
+ stack['delete'](object);
+ stack['delete'](other);
+ return result;
+ }
+
+ /**
+ * A specialized version of `baseRest` which flattens the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+ function flatRest(func) {
+ return setToString(overRest(func, undefined, flatten), func + '');
+ }
+
+ /**
+ * Creates an array of own enumerable property names and symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function getAllKeys(object) {
+ return baseGetAllKeys(object, keys, getSymbols);
+ }
+
+ /**
+ * Creates an array of own and inherited enumerable property names and
+ * symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function getAllKeysIn(object) {
+ return baseGetAllKeys(object, keysIn, getSymbolsIn);
+ }
+
+ /**
+ * Gets metadata for `func`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {*} Returns the metadata for `func`.
+ */
+ var getData = !metaMap ? noop : function(func) {
+ return metaMap.get(func);
+ };
+
+ /**
+ * Gets the name of `func`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {string} Returns the function name.
+ */
+ function getFuncName(func) {
+ var result = (func.name + ''),
+ array = realNames[result],
+ length = hasOwnProperty.call(realNames, result) ? array.length : 0;
+
+ while (length--) {
+ var data = array[length],
+ otherFunc = data.func;
+ if (otherFunc == null || otherFunc == func) {
+ return data.name;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the argument placeholder value for `func`.
+ *
+ * @private
+ * @param {Function} func The function to inspect.
+ * @returns {*} Returns the placeholder value.
+ */
+ function getHolder(func) {
+ var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
+ return object.placeholder;
+ }
+
+ /**
+ * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
+ * this function returns the custom method, otherwise it returns `baseIteratee`.
+ * If arguments are provided, the chosen function is invoked with them and
+ * its result is returned.
+ *
+ * @private
+ * @param {*} [value] The value to convert to an iteratee.
+ * @param {number} [arity] The arity of the created iteratee.
+ * @returns {Function} Returns the chosen function or its result.
+ */
+ function getIteratee() {
+ var result = lodash.iteratee || iteratee;
+ result = result === iteratee ? baseIteratee : result;
+ return arguments.length ? result(arguments[0], arguments[1]) : result;
+ }
+
+ /**
+ * Gets the data for `map`.
+ *
+ * @private
+ * @param {Object} map The map to query.
+ * @param {string} key The reference key.
+ * @returns {*} Returns the map data.
+ */
+ function getMapData(map, key) {
+ var data = map.__data__;
+ return isKeyable(key)
+ ? data[typeof key == 'string' ? 'string' : 'hash']
+ : data.map;
+ }
+
+ /**
+ * Gets the property names, values, and compare flags of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the match data of `object`.
+ */
+ function getMatchData(object) {
+ var result = keys(object),
+ length = result.length;
+
+ while (length--) {
+ var key = result[length],
+ value = object[key];
+
+ result[length] = [key, value, isStrictComparable(value)];
+ }
+ return result;
+ }
+
+ /**
+ * Gets the native function at `key` of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the method to get.
+ * @returns {*} Returns the function if it's native, else `undefined`.
+ */
+ function getNative(object, key) {
+ var value = getValue(object, key);
+ return baseIsNative(value) ? value : undefined;
+ }
+
+ /**
+ * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the raw `toStringTag`.
+ */
+ function getRawTag(value) {
+ var isOwn = hasOwnProperty.call(value, symToStringTag),
+ tag = value[symToStringTag];
+
+ try {
+ value[symToStringTag] = undefined;
+ var unmasked = true;
+ } catch (e) {}
+
+ var result = nativeObjectToString.call(value);
+ if (unmasked) {
+ if (isOwn) {
+ value[symToStringTag] = tag;
+ } else {
+ delete value[symToStringTag];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of the own enumerable symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of symbols.
+ */
+ var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
+ if (object == null) {
+ return [];
+ }
+ object = Object(object);
+ return arrayFilter(nativeGetSymbols(object), function(symbol) {
+ return propertyIsEnumerable.call(object, symbol);
+ });
+ };
+
+ /**
+ * Creates an array of the own and inherited enumerable symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of symbols.
+ */
+ var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
+ var result = [];
+ while (object) {
+ arrayPush(result, getSymbols(object));
+ object = getPrototype(object);
+ }
+ return result;
+ };
+
+ /**
+ * Gets the `toStringTag` of `value`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ */
+ var getTag = baseGetTag;
+
+ // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
+ if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
+ (Map && getTag(new Map) != mapTag) ||
+ (Promise && getTag(Promise.resolve()) != promiseTag) ||
+ (Set && getTag(new Set) != setTag) ||
+ (WeakMap && getTag(new WeakMap) != weakMapTag)) {
+ getTag = function(value) {
+ var result = baseGetTag(value),
+ Ctor = result == objectTag ? value.constructor : undefined,
+ ctorString = Ctor ? toSource(Ctor) : '';
+
+ if (ctorString) {
+ switch (ctorString) {
+ case dataViewCtorString: return dataViewTag;
+ case mapCtorString: return mapTag;
+ case promiseCtorString: return promiseTag;
+ case setCtorString: return setTag;
+ case weakMapCtorString: return weakMapTag;
+ }
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Gets the view, applying any `transforms` to the `start` and `end` positions.
+ *
+ * @private
+ * @param {number} start The start of the view.
+ * @param {number} end The end of the view.
+ * @param {Array} transforms The transformations to apply to the view.
+ * @returns {Object} Returns an object containing the `start` and `end`
+ * positions of the view.
+ */
+ function getView(start, end, transforms) {
+ var index = -1,
+ length = transforms.length;
+
+ while (++index < length) {
+ var data = transforms[index],
+ size = data.size;
+
+ switch (data.type) {
+ case 'drop': start += size; break;
+ case 'dropRight': end -= size; break;
+ case 'take': end = nativeMin(end, start + size); break;
+ case 'takeRight': start = nativeMax(start, end - size); break;
+ }
+ }
+ return { 'start': start, 'end': end };
+ }
+
+ /**
+ * Extracts wrapper details from the `source` body comment.
+ *
+ * @private
+ * @param {string} source The source to inspect.
+ * @returns {Array} Returns the wrapper details.
+ */
+ function getWrapDetails(source) {
+ var match = source.match(reWrapDetails);
+ return match ? match[1].split(reSplitDetails) : [];
+ }
+
+ /**
+ * Checks if `path` exists on `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @param {Function} hasFunc The function to check properties.
+ * @returns {boolean} Returns `true` if `path` exists, else `false`.
+ */
+ function hasPath(object, path, hasFunc) {
+ path = castPath(path, object);
+
+ var index = -1,
+ length = path.length,
+ result = false;
+
+ while (++index < length) {
+ var key = toKey(path[index]);
+ if (!(result = object != null && hasFunc(object, key))) {
+ break;
+ }
+ object = object[key];
+ }
+ if (result || ++index != length) {
+ return result;
+ }
+ length = object == null ? 0 : object.length;
+ return !!length && isLength(length) && isIndex(key, length) &&
+ (isArray(object) || isArguments(object));
+ }
+
+ /**
+ * Initializes an array clone.
+ *
+ * @private
+ * @param {Array} array The array to clone.
+ * @returns {Array} Returns the initialized clone.
+ */
+ function initCloneArray(array) {
+ var length = array.length,
+ result = new array.constructor(length);
+
+ // Add properties assigned by `RegExp#exec`.
+ if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+ result.index = array.index;
+ result.input = array.input;
+ }
+ return result;
+ }
+
+ /**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneObject(object) {
+ return (typeof object.constructor == 'function' && !isPrototype(object))
+ ? baseCreate(getPrototype(object))
+ : {};
+ }
+
+ /**
+ * Initializes an object clone based on its `toStringTag`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The `toStringTag` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneByTag(object, tag, isDeep) {
+ var Ctor = object.constructor;
+ switch (tag) {
+ case arrayBufferTag:
+ return cloneArrayBuffer(object);
+
+ case boolTag:
+ case dateTag:
+ return new Ctor(+object);
+
+ case dataViewTag:
+ return cloneDataView(object, isDeep);
+
+ case float32Tag: case float64Tag:
+ case int8Tag: case int16Tag: case int32Tag:
+ case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+ return cloneTypedArray(object, isDeep);
+
+ case mapTag:
+ return new Ctor;
+
+ case numberTag:
+ case stringTag:
+ return new Ctor(object);
+
+ case regexpTag:
+ return cloneRegExp(object);
+
+ case setTag:
+ return new Ctor;
+
+ case symbolTag:
+ return cloneSymbol(object);
+ }
+ }
+
+ /**
+ * Inserts wrapper `details` in a comment at the top of the `source` body.
+ *
+ * @private
+ * @param {string} source The source to modify.
+ * @returns {Array} details The details to insert.
+ * @returns {string} Returns the modified source.
+ */
+ function insertWrapDetails(source, details) {
+ var length = details.length;
+ if (!length) {
+ return source;
+ }
+ var lastIndex = length - 1;
+ details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
+ details = details.join(length > 2 ? ', ' : ' ');
+ return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
+ }
+
+ /**
+ * Checks if `value` is a flattenable `arguments` object or array.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
+ */
+ function isFlattenable(value) {
+ return isArray(value) || isArguments(value) ||
+ !!(spreadableSymbol && value && value[spreadableSymbol]);
+ }
+
+ /**
+ * Checks if `value` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+ */
+ function isIndex(value, length) {
+ var type = typeof value;
+ length = length == null ? MAX_SAFE_INTEGER : length;
+
+ return !!length &&
+ (type == 'number' ||
+ (type != 'symbol' && reIsUint.test(value))) &&
+ (value > -1 && value % 1 == 0 && value < length);
+ }
+
+ /**
+ * Checks if the given arguments are from an iteratee call.
+ *
+ * @private
+ * @param {*} value The potential iteratee value argument.
+ * @param {*} index The potential iteratee index or key argument.
+ * @param {*} object The potential iteratee object argument.
+ * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
+ * else `false`.
+ */
+ function isIterateeCall(value, index, object) {
+ if (!isObject(object)) {
+ return false;
+ }
+ var type = typeof index;
+ if (type == 'number'
+ ? (isArrayLike(object) && isIndex(index, object.length))
+ : (type == 'string' && index in object)
+ ) {
+ return eq(object[index], value);
+ }
+ return false;
+ }
+
+ /**
+ * Checks if `value` is a property name and not a property path.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {Object} [object] The object to query keys on.
+ * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
+ */
+ function isKey(value, object) {
+ if (isArray(value)) {
+ return false;
+ }
+ var type = typeof value;
+ if (type == 'number' || type == 'symbol' || type == 'boolean' ||
+ value == null || isSymbol(value)) {
+ return true;
+ }
+ return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+ (object != null && value in Object(object));
+ }
+
+ /**
+ * Checks if `value` is suitable for use as unique object key.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
+ */
+ function isKeyable(value) {
+ var type = typeof value;
+ return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+ ? (value !== '__proto__')
+ : (value === null);
+ }
+
+ /**
+ * Checks if `func` has a lazy counterpart.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
+ * else `false`.
+ */
+ function isLaziable(func) {
+ var funcName = getFuncName(func),
+ other = lodash[funcName];
+
+ if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
+ return false;
+ }
+ if (func === other) {
+ return true;
+ }
+ var data = getData(other);
+ return !!data && func === data[0];
+ }
+
+ /**
+ * Checks if `func` has its source masked.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns `true` if `func` is masked, else `false`.
+ */
+ function isMasked(func) {
+ return !!maskSrcKey && (maskSrcKey in func);
+ }
+
+ /**
+ * Checks if `func` is capable of being masked.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
+ */
+ var isMaskable = coreJsData ? isFunction : stubFalse;
+
+ /**
+ * Checks if `value` is likely a prototype object.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
+ */
+ function isPrototype(value) {
+ var Ctor = value && value.constructor,
+ proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
+
+ return value === proto;
+ }
+
+ /**
+ * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` if suitable for strict
+ * equality comparisons, else `false`.
+ */
+ function isStrictComparable(value) {
+ return value === value && !isObject(value);
+ }
+
+ /**
+ * A specialized version of `matchesProperty` for source values suitable
+ * for strict equality comparisons, i.e. `===`.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function matchesStrictComparable(key, srcValue) {
+ return function(object) {
+ if (object == null) {
+ return false;
+ }
+ return object[key] === srcValue &&
+ (srcValue !== undefined || (key in Object(object)));
+ };
+ }
+
+ /**
+ * A specialized version of `_.memoize` which clears the memoized function's
+ * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+ *
+ * @private
+ * @param {Function} func The function to have its output memoized.
+ * @returns {Function} Returns the new memoized function.
+ */
+ function memoizeCapped(func) {
+ var result = memoize(func, function(key) {
+ if (cache.size === MAX_MEMOIZE_SIZE) {
+ cache.clear();
+ }
+ return key;
+ });
+
+ var cache = result.cache;
+ return result;
+ }
+
+ /**
+ * Merges the function metadata of `source` into `data`.
+ *
+ * Merging metadata reduces the number of wrappers used to invoke a function.
+ * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
+ * may be applied regardless of execution order. Methods like `_.ary` and
+ * `_.rearg` modify function arguments, making the order in which they are
+ * executed important, preventing the merging of metadata. However, we make
+ * an exception for a safe combined case where curried functions have `_.ary`
+ * and or `_.rearg` applied.
+ *
+ * @private
+ * @param {Array} data The destination metadata.
+ * @param {Array} source The source metadata.
+ * @returns {Array} Returns `data`.
+ */
+ function mergeData(data, source) {
+ var bitmask = data[1],
+ srcBitmask = source[1],
+ newBitmask = bitmask | srcBitmask,
+ isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
+
+ var isCombo =
+ ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
+ ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
+ ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
+
+ // Exit early if metadata can't be merged.
+ if (!(isCommon || isCombo)) {
+ return data;
+ }
+ // Use source `thisArg` if available.
+ if (srcBitmask & WRAP_BIND_FLAG) {
+ data[2] = source[2];
+ // Set when currying a bound function.
+ newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
+ }
+ // Compose partial arguments.
+ var value = source[3];
+ if (value) {
+ var partials = data[3];
+ data[3] = partials ? composeArgs(partials, value, source[4]) : value;
+ data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
+ }
+ // Compose partial right arguments.
+ value = source[5];
+ if (value) {
+ partials = data[5];
+ data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
+ data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
+ }
+ // Use source `argPos` if available.
+ value = source[7];
+ if (value) {
+ data[7] = value;
+ }
+ // Use source `ary` if it's smaller.
+ if (srcBitmask & WRAP_ARY_FLAG) {
+ data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
+ }
+ // Use source `arity` if one is not provided.
+ if (data[9] == null) {
+ data[9] = source[9];
+ }
+ // Use source `func` and merge bitmasks.
+ data[0] = source[0];
+ data[1] = newBitmask;
+
+ return data;
+ }
+
+ /**
+ * This function is like
+ * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+ * except that it includes inherited enumerable properties.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function nativeKeysIn(object) {
+ var result = [];
+ if (object != null) {
+ for (var key in Object(object)) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Converts `value` to a string using `Object.prototype.toString`.
+ *
+ * @private
+ * @param {*} value The value to convert.
+ * @returns {string} Returns the converted string.
+ */
+ function objectToString(value) {
+ return nativeObjectToString.call(value);
+ }
+
+ /**
+ * A specialized version of `baseRest` which transforms the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @param {Function} transform The rest array transform.
+ * @returns {Function} Returns the new function.
+ */
+ function overRest(func, start, transform) {
+ start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+ return function() {
+ var args = arguments,
+ index = -1,
+ length = nativeMax(args.length - start, 0),
+ array = Array(length);
+
+ while (++index < length) {
+ array[index] = args[start + index];
+ }
+ index = -1;
+ var otherArgs = Array(start + 1);
+ while (++index < start) {
+ otherArgs[index] = args[index];
+ }
+ otherArgs[start] = transform(array);
+ return apply(func, this, otherArgs);
+ };
+ }
+
+ /**
+ * Gets the parent value at `path` of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} path The path to get the parent value of.
+ * @returns {*} Returns the parent value.
+ */
+ function parent(object, path) {
+ return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
+ }
+
+ /**
+ * Reorder `array` according to the specified indexes where the element at
+ * the first index is assigned as the first element, the element at
+ * the second index is assigned as the second element, and so on.
+ *
+ * @private
+ * @param {Array} array The array to reorder.
+ * @param {Array} indexes The arranged array indexes.
+ * @returns {Array} Returns `array`.
+ */
+ function reorder(array, indexes) {
+ var arrLength = array.length,
+ length = nativeMin(indexes.length, arrLength),
+ oldArray = copyArray(array);
+
+ while (length--) {
+ var index = indexes[length];
+ array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
+ }
+ return array;
+ }
+
+ /**
+ * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the property to get.
+ * @returns {*} Returns the property value.
+ */
+ function safeGet(object, key) {
+ if (key === 'constructor' && typeof object[key] === 'function') {
+ return;
+ }
+
+ if (key == '__proto__') {
+ return;
+ }
+
+ return object[key];
+ }
+
+ /**
+ * Sets metadata for `func`.
+ *
+ * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+ * period of time, it will trip its breaker and transition to an identity
+ * function to avoid garbage collection pauses in V8. See
+ * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
+ * for more details.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns `func`.
+ */
+ var setData = shortOut(baseSetData);
+
+ /**
+ * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
+ *
+ * @private
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @returns {number|Object} Returns the timer id or timeout object.
+ */
+ var setTimeout = ctxSetTimeout || function(func, wait) {
+ return root.setTimeout(func, wait);
+ };
+
+ /**
+ * Sets the `toString` method of `func` to return `string`.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+ var setToString = shortOut(baseSetToString);
+
+ /**
+ * Sets the `toString` method of `wrapper` to mimic the source of `reference`
+ * with wrapper details in a comment at the top of the source body.
+ *
+ * @private
+ * @param {Function} wrapper The function to modify.
+ * @param {Function} reference The reference function.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @returns {Function} Returns `wrapper`.
+ */
+ function setWrapToString(wrapper, reference, bitmask) {
+ var source = (reference + '');
+ return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+ }
+
+ /**
+ * Creates a function that'll short out and invoke `identity` instead
+ * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+ * milliseconds.
+ *
+ * @private
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new shortable function.
+ */
+ function shortOut(func) {
+ var count = 0,
+ lastCalled = 0;
+
+ return function() {
+ var stamp = nativeNow(),
+ remaining = HOT_SPAN - (stamp - lastCalled);
+
+ lastCalled = stamp;
+ if (remaining > 0) {
+ if (++count >= HOT_COUNT) {
+ return arguments[0];
+ }
+ } else {
+ count = 0;
+ }
+ return func.apply(undefined, arguments);
+ };
+ }
+
+ /**
+ * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @param {number} [size=array.length] The size of `array`.
+ * @returns {Array} Returns `array`.
+ */
+ function shuffleSelf(array, size) {
+ var index = -1,
+ length = array.length,
+ lastIndex = length - 1;
+
+ size = size === undefined ? length : size;
+ while (++index < size) {
+ var rand = baseRandom(index, lastIndex),
+ value = array[rand];
+
+ array[rand] = array[index];
+ array[index] = value;
+ }
+ array.length = size;
+ return array;
+ }
+
+ /**
+ * Converts `string` to a property path array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the property path array.
+ */
+ var stringToPath = memoizeCapped(function(string) {
+ var result = [];
+ if (string.charCodeAt(0) === 46 /* . */) {
+ result.push('');
+ }
+ string.replace(rePropName, function(match, number, quote, subString) {
+ result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
+ });
+ return result;
+ });
+
+ /**
+ * Converts `value` to a string key if it's not a string or symbol.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {string|symbol} Returns the key.
+ */
+ function toKey(value) {
+ if (typeof value == 'string' || isSymbol(value)) {
+ return value;
+ }
+ var result = (value + '');
+ return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+ }
+
+ /**
+ * Converts `func` to its source code.
+ *
+ * @private
+ * @param {Function} func The function to convert.
+ * @returns {string} Returns the source code.
+ */
+ function toSource(func) {
+ if (func != null) {
+ try {
+ return funcToString.call(func);
+ } catch (e) {}
+ try {
+ return (func + '');
+ } catch (e) {}
+ }
+ return '';
+ }
+
+ /**
+ * Updates wrapper `details` based on `bitmask` flags.
+ *
+ * @private
+ * @returns {Array} details The details to modify.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @returns {Array} Returns `details`.
+ */
+ function updateWrapDetails(details, bitmask) {
+ arrayEach(wrapFlags, function(pair) {
+ var value = '_.' + pair[0];
+ if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
+ details.push(value);
+ }
+ });
+ return details.sort();
+ }
+
+ /**
+ * Creates a clone of `wrapper`.
+ *
+ * @private
+ * @param {Object} wrapper The wrapper to clone.
+ * @returns {Object} Returns the cloned wrapper.
+ */
+ function wrapperClone(wrapper) {
+ if (wrapper instanceof LazyWrapper) {
+ return wrapper.clone();
+ }
+ var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
+ result.__actions__ = copyArray(wrapper.__actions__);
+ result.__index__ = wrapper.__index__;
+ result.__values__ = wrapper.__values__;
+ return result;
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of elements split into groups the length of `size`.
+ * If `array` can't be split evenly, the final chunk will be the remaining
+ * elements.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to process.
+ * @param {number} [size=1] The length of each chunk
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the new array of chunks.
+ * @example
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 2);
+ * // => [['a', 'b'], ['c', 'd']]
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 3);
+ * // => [['a', 'b', 'c'], ['d']]
+ */
+ function chunk(array, size, guard) {
+ if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
+ size = 1;
+ } else {
+ size = nativeMax(toInteger(size), 0);
+ }
+ var length = array == null ? 0 : array.length;
+ if (!length || size < 1) {
+ return [];
+ }
+ var index = 0,
+ resIndex = 0,
+ result = Array(nativeCeil(length / size));
+
+ while (index < length) {
+ result[resIndex++] = baseSlice(array, index, (index += size));
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array with all falsey values removed. The values `false`, `null`,
+ * `0`, `""`, `undefined`, and `NaN` are falsey.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to compact.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.compact([0, 1, false, 2, '', 3]);
+ * // => [1, 2, 3]
+ */
+ function compact(array) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value) {
+ result[resIndex++] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates a new array concatenating `array` with any additional arrays
+ * and/or values.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to concatenate.
+ * @param {...*} [values] The values to concatenate.
+ * @returns {Array} Returns the new concatenated array.
+ * @example
+ *
+ * var array = [1];
+ * var other = _.concat(array, 2, [3], [[4]]);
+ *
+ * console.log(other);
+ * // => [1, 2, 3, [4]]
+ *
+ * console.log(array);
+ * // => [1]
+ */
+ function concat() {
+ var length = arguments.length;
+ if (!length) {
+ return [];
+ }
+ var args = Array(length - 1),
+ array = arguments[0],
+ index = length;
+
+ while (index--) {
+ args[index - 1] = arguments[index];
+ }
+ return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
+ }
+
+ /**
+ * Creates an array of `array` values not included in the other given arrays
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
+ *
+ * **Note:** Unlike `_.pullAll`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.without, _.xor
+ * @example
+ *
+ * _.difference([2, 1], [2, 3]);
+ * // => [1]
+ */
+ var difference = baseRest(function(array, values) {
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
+ : [];
+ });
+
+ /**
+ * This method is like `_.difference` except that it accepts `iteratee` which
+ * is invoked for each element of `array` and `values` to generate the criterion
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [1.2]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
+ * // => [{ 'x': 2 }]
+ */
+ var differenceBy = baseRest(function(array, values) {
+ var iteratee = last(values);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
+ : [];
+ });
+
+ /**
+ * This method is like `_.difference` except that it accepts `comparator`
+ * which is invoked to compare elements of `array` to `values`. The order and
+ * references of result values are determined by the first array. The comparator
+ * is invoked with two arguments: (arrVal, othVal).
+ *
+ * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ *
+ * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
+ * // => [{ 'x': 2, 'y': 1 }]
+ */
+ var differenceWith = baseRest(function(array, values) {
+ var comparator = last(values);
+ if (isArrayLikeObject(comparator)) {
+ comparator = undefined;
+ }
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
+ : [];
+ });
+
+ /**
+ * Creates a slice of `array` with `n` elements dropped from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.drop([1, 2, 3]);
+ * // => [2, 3]
+ *
+ * _.drop([1, 2, 3], 2);
+ * // => [3]
+ *
+ * _.drop([1, 2, 3], 5);
+ * // => []
+ *
+ * _.drop([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function drop(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ return baseSlice(array, n < 0 ? 0 : n, length);
+ }
+
+ /**
+ * Creates a slice of `array` with `n` elements dropped from the end.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropRight([1, 2, 3]);
+ * // => [1, 2]
+ *
+ * _.dropRight([1, 2, 3], 2);
+ * // => [1]
+ *
+ * _.dropRight([1, 2, 3], 5);
+ * // => []
+ *
+ * _.dropRight([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function dropRight(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ n = length - n;
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` excluding elements dropped from the end.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * invoked with three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.dropRightWhile(users, function(o) { return !o.active; });
+ * // => objects for ['barney']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
+ * // => objects for ['barney', 'fred']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.dropRightWhile(users, ['active', false]);
+ * // => objects for ['barney']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.dropRightWhile(users, 'active');
+ * // => objects for ['barney', 'fred', 'pebbles']
+ */
+ function dropRightWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), true, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of `array` excluding elements dropped from the beginning.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * invoked with three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.dropWhile(users, function(o) { return !o.active; });
+ * // => objects for ['pebbles']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.dropWhile(users, { 'user': 'barney', 'active': false });
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.dropWhile(users, ['active', false]);
+ * // => objects for ['pebbles']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.dropWhile(users, 'active');
+ * // => objects for ['barney', 'fred', 'pebbles']
+ */
+ function dropWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), true)
+ : [];
+ }
+
+ /**
+ * Fills elements of `array` with `value` from `start` up to, but not
+ * including, `end`.
+ *
+ * **Note:** This method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.2.0
+ * @category Array
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _.fill(array, 'a');
+ * console.log(array);
+ * // => ['a', 'a', 'a']
+ *
+ * _.fill(Array(3), 2);
+ * // => [2, 2, 2]
+ *
+ * _.fill([4, 6, 8, 10], '*', 1, 3);
+ * // => [4, '*', '*', 10]
+ */
+ function fill(array, value, start, end) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+ start = 0;
+ end = length;
+ }
+ return baseFill(array, value, start, end);
+ }
+
+ /**
+ * This method is like `_.find` except that it returns the index of the first
+ * element `predicate` returns truthy for instead of the element itself.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.findIndex(users, function(o) { return o.user == 'barney'; });
+ * // => 0
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.findIndex(users, { 'user': 'fred', 'active': false });
+ * // => 1
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.findIndex(users, ['active', false]);
+ * // => 0
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.findIndex(users, 'active');
+ * // => 2
+ */
+ function findIndex(array, predicate, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = fromIndex == null ? 0 : toInteger(fromIndex);
+ if (index < 0) {
+ index = nativeMax(length + index, 0);
+ }
+ return baseFindIndex(array, getIteratee(predicate, 3), index);
+ }
+
+ /**
+ * This method is like `_.findIndex` except that it iterates over elements
+ * of `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=array.length-1] The index to search from.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
+ * // => 2
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.findLastIndex(users, { 'user': 'barney', 'active': true });
+ * // => 0
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.findLastIndex(users, ['active', false]);
+ * // => 2
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.findLastIndex(users, 'active');
+ * // => 0
+ */
+ function findLastIndex(array, predicate, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = length - 1;
+ if (fromIndex !== undefined) {
+ index = toInteger(fromIndex);
+ index = fromIndex < 0
+ ? nativeMax(length + index, 0)
+ : nativeMin(index, length - 1);
+ }
+ return baseFindIndex(array, getIteratee(predicate, 3), index, true);
+ }
+
+ /**
+ * Flattens `array` a single level deep.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flatten([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, [3, [4]], 5]
+ */
+ function flatten(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseFlatten(array, 1) : [];
+ }
+
+ /**
+ * Recursively flattens `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flattenDeep([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, 3, 4, 5]
+ */
+ function flattenDeep(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseFlatten(array, INFINITY) : [];
+ }
+
+ /**
+ * Recursively flatten `array` up to `depth` times.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.4.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @param {number} [depth=1] The maximum recursion depth.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * var array = [1, [2, [3, [4]], 5]];
+ *
+ * _.flattenDepth(array, 1);
+ * // => [1, 2, [3, [4]], 5]
+ *
+ * _.flattenDepth(array, 2);
+ * // => [1, 2, 3, [4], 5]
+ */
+ function flattenDepth(array, depth) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ depth = depth === undefined ? 1 : toInteger(depth);
+ return baseFlatten(array, depth);
+ }
+
+ /**
+ * The inverse of `_.toPairs`; this method returns an object composed
+ * from key-value `pairs`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} pairs The key-value pairs.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.fromPairs([['a', 1], ['b', 2]]);
+ * // => { 'a': 1, 'b': 2 }
+ */
+ function fromPairs(pairs) {
+ var index = -1,
+ length = pairs == null ? 0 : pairs.length,
+ result = {};
+
+ while (++index < length) {
+ var pair = pairs[index];
+ result[pair[0]] = pair[1];
+ }
+ return result;
+ }
+
+ /**
+ * Gets the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @alias first
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the first element of `array`.
+ * @example
+ *
+ * _.head([1, 2, 3]);
+ * // => 1
+ *
+ * _.head([]);
+ * // => undefined
+ */
+ function head(array) {
+ return (array && array.length) ? array[0] : undefined;
+ }
+
+ /**
+ * Gets the index at which the first occurrence of `value` is found in `array`
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it's used as the
+ * offset from the end of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.indexOf([1, 2, 1, 2], 2);
+ * // => 1
+ *
+ * // Search from the `fromIndex`.
+ * _.indexOf([1, 2, 1, 2], 2, 2);
+ * // => 3
+ */
+ function indexOf(array, value, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = fromIndex == null ? 0 : toInteger(fromIndex);
+ if (index < 0) {
+ index = nativeMax(length + index, 0);
+ }
+ return baseIndexOf(array, value, index);
+ }
+
+ /**
+ * Gets all but the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.initial([1, 2, 3]);
+ * // => [1, 2]
+ */
+ function initial(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseSlice(array, 0, -1) : [];
+ }
+
+ /**
+ * Creates an array of unique values that are included in all given arrays
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * _.intersection([2, 1], [2, 3]);
+ * // => [2]
+ */
+ var intersection = baseRest(function(arrays) {
+ var mapped = arrayMap(arrays, castArrayLikeObject);
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped)
+ : [];
+ });
+
+ /**
+ * This method is like `_.intersection` except that it accepts `iteratee`
+ * which is invoked for each element of each `arrays` to generate the criterion
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [2.1]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }]
+ */
+ var intersectionBy = baseRest(function(arrays) {
+ var iteratee = last(arrays),
+ mapped = arrayMap(arrays, castArrayLikeObject);
+
+ if (iteratee === last(mapped)) {
+ iteratee = undefined;
+ } else {
+ mapped.pop();
+ }
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped, getIteratee(iteratee, 2))
+ : [];
+ });
+
+ /**
+ * This method is like `_.intersection` except that it accepts `comparator`
+ * which is invoked to compare elements of `arrays`. The order and references
+ * of result values are determined by the first array. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.intersectionWith(objects, others, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }]
+ */
+ var intersectionWith = baseRest(function(arrays) {
+ var comparator = last(arrays),
+ mapped = arrayMap(arrays, castArrayLikeObject);
+
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ if (comparator) {
+ mapped.pop();
+ }
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped, undefined, comparator)
+ : [];
+ });
+
+ /**
+ * Converts all elements in `array` into a string separated by `separator`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to convert.
+ * @param {string} [separator=','] The element separator.
+ * @returns {string} Returns the joined string.
+ * @example
+ *
+ * _.join(['a', 'b', 'c'], '~');
+ * // => 'a~b~c'
+ */
+ function join(array, separator) {
+ return array == null ? '' : nativeJoin.call(array, separator);
+ }
+
+ /**
+ * Gets the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the last element of `array`.
+ * @example
+ *
+ * _.last([1, 2, 3]);
+ * // => 3
+ */
+ function last(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? array[length - 1] : undefined;
+ }
+
+ /**
+ * This method is like `_.indexOf` except that it iterates over elements of
+ * `array` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=array.length-1] The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 1, 2], 2);
+ * // => 3
+ *
+ * // Search from the `fromIndex`.
+ * _.lastIndexOf([1, 2, 1, 2], 2, 2);
+ * // => 1
+ */
+ function lastIndexOf(array, value, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = length;
+ if (fromIndex !== undefined) {
+ index = toInteger(fromIndex);
+ index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
+ }
+ return value === value
+ ? strictLastIndexOf(array, value, index)
+ : baseFindIndex(array, baseIsNaN, index, true);
+ }
+
+ /**
+ * Gets the element at index `n` of `array`. If `n` is negative, the nth
+ * element from the end is returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.11.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=0] The index of the element to return.
+ * @returns {*} Returns the nth element of `array`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'd'];
+ *
+ * _.nth(array, 1);
+ * // => 'b'
+ *
+ * _.nth(array, -2);
+ * // => 'c';
+ */
+ function nth(array, n) {
+ return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
+ }
+
+ /**
+ * Removes all given values from `array` using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
+ * to remove elements from an array by predicate.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...*} [values] The values to remove.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+ *
+ * _.pull(array, 'a', 'c');
+ * console.log(array);
+ * // => ['b', 'b']
+ */
+ var pull = baseRest(pullAll);
+
+ /**
+ * This method is like `_.pull` except that it accepts an array of values to remove.
+ *
+ * **Note:** Unlike `_.difference`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+ *
+ * _.pullAll(array, ['a', 'c']);
+ * console.log(array);
+ * // => ['b', 'b']
+ */
+ function pullAll(array, values) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values)
+ : array;
+ }
+
+ /**
+ * This method is like `_.pullAll` except that it accepts `iteratee` which is
+ * invoked for each element of `array` and `values` to generate the criterion
+ * by which they're compared. The iteratee is invoked with one argument: (value).
+ *
+ * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
+ *
+ * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
+ * console.log(array);
+ * // => [{ 'x': 2 }]
+ */
+ function pullAllBy(array, values, iteratee) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values, getIteratee(iteratee, 2))
+ : array;
+ }
+
+ /**
+ * This method is like `_.pullAll` except that it accepts `comparator` which
+ * is invoked to compare elements of `array` to `values`. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
+ *
+ * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.6.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
+ *
+ * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
+ * console.log(array);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
+ */
+ function pullAllWith(array, values, comparator) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values, undefined, comparator)
+ : array;
+ }
+
+ /**
+ * Removes elements from `array` corresponding to `indexes` and returns an
+ * array of removed elements.
+ *
+ * **Note:** Unlike `_.at`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...(number|number[])} [indexes] The indexes of elements to remove.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'd'];
+ * var pulled = _.pullAt(array, [1, 3]);
+ *
+ * console.log(array);
+ * // => ['a', 'c']
+ *
+ * console.log(pulled);
+ * // => ['b', 'd']
+ */
+ var pullAt = flatRest(function(array, indexes) {
+ var length = array == null ? 0 : array.length,
+ result = baseAt(array, indexes);
+
+ basePullAt(array, arrayMap(indexes, function(index) {
+ return isIndex(index, length) ? +index : index;
+ }).sort(compareAscending));
+
+ return result;
+ });
+
+ /**
+ * Removes all elements from `array` that `predicate` returns truthy for
+ * and returns an array of the removed elements. The predicate is invoked
+ * with three arguments: (value, index, array).
+ *
+ * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
+ * to pull elements from an array by value.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [1, 2, 3, 4];
+ * var evens = _.remove(array, function(n) {
+ * return n % 2 == 0;
+ * });
+ *
+ * console.log(array);
+ * // => [1, 3]
+ *
+ * console.log(evens);
+ * // => [2, 4]
+ */
+ function remove(array, predicate) {
+ var result = [];
+ if (!(array && array.length)) {
+ return result;
+ }
+ var index = -1,
+ indexes = [],
+ length = array.length;
+
+ predicate = getIteratee(predicate, 3);
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result.push(value);
+ indexes.push(index);
+ }
+ }
+ basePullAt(array, indexes);
+ return result;
+ }
+
+ /**
+ * Reverses `array` so that the first element becomes the last, the second
+ * element becomes the second to last, and so on.
+ *
+ * **Note:** This method mutates `array` and is based on
+ * [`Array#reverse`](https://mdn.io/Array/reverse).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _.reverse(array);
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+ function reverse(array) {
+ return array == null ? array : nativeReverse.call(array);
+ }
+
+ /**
+ * Creates a slice of `array` from `start` up to, but not including, `end`.
+ *
+ * **Note:** This method is used instead of
+ * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
+ * returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function slice(array, start, end) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
+ start = 0;
+ end = length;
+ }
+ else {
+ start = start == null ? 0 : toInteger(start);
+ end = end === undefined ? length : toInteger(end);
+ }
+ return baseSlice(array, start, end);
+ }
+
+ /**
+ * Uses a binary search to determine the lowest index at which `value`
+ * should be inserted into `array` in order to maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * _.sortedIndex([30, 50], 40);
+ * // => 1
+ */
+ function sortedIndex(array, value) {
+ return baseSortedIndex(array, value);
+ }
+
+ /**
+ * This method is like `_.sortedIndex` except that it accepts `iteratee`
+ * which is invoked for `value` and each element of `array` to compute their
+ * sort ranking. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * var objects = [{ 'x': 4 }, { 'x': 5 }];
+ *
+ * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+ * // => 0
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
+ * // => 0
+ */
+ function sortedIndexBy(array, value, iteratee) {
+ return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
+ }
+
+ /**
+ * This method is like `_.indexOf` except that it performs a binary
+ * search on a sorted `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
+ * // => 1
+ */
+ function sortedIndexOf(array, value) {
+ var length = array == null ? 0 : array.length;
+ if (length) {
+ var index = baseSortedIndex(array, value);
+ if (index < length && eq(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * This method is like `_.sortedIndex` except that it returns the highest
+ * index at which `value` should be inserted into `array` in order to
+ * maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
+ * // => 4
+ */
+ function sortedLastIndex(array, value) {
+ return baseSortedIndex(array, value, true);
+ }
+
+ /**
+ * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
+ * which is invoked for `value` and each element of `array` to compute their
+ * sort ranking. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * var objects = [{ 'x': 4 }, { 'x': 5 }];
+ *
+ * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+ * // => 1
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
+ * // => 1
+ */
+ function sortedLastIndexBy(array, value, iteratee) {
+ return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
+ }
+
+ /**
+ * This method is like `_.lastIndexOf` except that it performs a binary
+ * search on a sorted `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
+ * // => 3
+ */
+ function sortedLastIndexOf(array, value) {
+ var length = array == null ? 0 : array.length;
+ if (length) {
+ var index = baseSortedIndex(array, value, true) - 1;
+ if (eq(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * This method is like `_.uniq` except that it's designed and optimized
+ * for sorted arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.sortedUniq([1, 1, 2]);
+ * // => [1, 2]
+ */
+ function sortedUniq(array) {
+ return (array && array.length)
+ ? baseSortedUniq(array)
+ : [];
+ }
+
+ /**
+ * This method is like `_.uniqBy` except that it's designed and optimized
+ * for sorted arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
+ * // => [1.1, 2.3]
+ */
+ function sortedUniqBy(array, iteratee) {
+ return (array && array.length)
+ ? baseSortedUniq(array, getIteratee(iteratee, 2))
+ : [];
+ }
+
+ /**
+ * Gets all but the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.tail([1, 2, 3]);
+ * // => [2, 3]
+ */
+ function tail(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseSlice(array, 1, length) : [];
+ }
+
+ /**
+ * Creates a slice of `array` with `n` elements taken from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.take([1, 2, 3]);
+ * // => [1]
+ *
+ * _.take([1, 2, 3], 2);
+ * // => [1, 2]
+ *
+ * _.take([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.take([1, 2, 3], 0);
+ * // => []
+ */
+ function take(array, n, guard) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` with `n` elements taken from the end.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeRight([1, 2, 3]);
+ * // => [3]
+ *
+ * _.takeRight([1, 2, 3], 2);
+ * // => [2, 3]
+ *
+ * _.takeRight([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.takeRight([1, 2, 3], 0);
+ * // => []
+ */
+ function takeRight(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ n = length - n;
+ return baseSlice(array, n < 0 ? 0 : n, length);
+ }
+
+ /**
+ * Creates a slice of `array` with elements taken from the end. Elements are
+ * taken until `predicate` returns falsey. The predicate is invoked with
+ * three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.takeRightWhile(users, function(o) { return !o.active; });
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
+ * // => objects for ['pebbles']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.takeRightWhile(users, ['active', false]);
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.takeRightWhile(users, 'active');
+ * // => []
+ */
+ function takeRightWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), false, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of `array` with elements taken from the beginning. Elements
+ * are taken until `predicate` returns falsey. The predicate is invoked with
+ * three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.takeWhile(users, function(o) { return !o.active; });
+ * // => objects for ['barney', 'fred']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.takeWhile(users, { 'user': 'barney', 'active': false });
+ * // => objects for ['barney']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.takeWhile(users, ['active', false]);
+ * // => objects for ['barney', 'fred']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.takeWhile(users, 'active');
+ * // => []
+ */
+ function takeWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3))
+ : [];
+ }
+
+ /**
+ * Creates an array of unique values, in order, from all given arrays using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.union([2], [1, 2]);
+ * // => [2, 1]
+ */
+ var union = baseRest(function(arrays) {
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
+ });
+
+ /**
+ * This method is like `_.union` except that it accepts `iteratee` which is
+ * invoked for each element of each `arrays` to generate the criterion by
+ * which uniqueness is computed. Result values are chosen from the first
+ * array in which the value occurs. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.unionBy([2.1], [1.2, 2.3], Math.floor);
+ * // => [2.1, 1.2]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ var unionBy = baseRest(function(arrays) {
+ var iteratee = last(arrays);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
+ });
+
+ /**
+ * This method is like `_.union` except that it accepts `comparator` which
+ * is invoked to compare elements of `arrays`. Result values are chosen from
+ * the first array in which the value occurs. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.unionWith(objects, others, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+ */
+ var unionWith = baseRest(function(arrays) {
+ var comparator = last(arrays);
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
+ });
+
+ /**
+ * Creates a duplicate-free version of an array, using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons, in which only the first occurrence of each element
+ * is kept. The order of result values is determined by the order they occur
+ * in the array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.uniq([2, 1, 2]);
+ * // => [2, 1]
+ */
+ function uniq(array) {
+ return (array && array.length) ? baseUniq(array) : [];
+ }
+
+ /**
+ * This method is like `_.uniq` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the criterion by which
+ * uniqueness is computed. The order of result values is determined by the
+ * order they occur in the array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
+ * // => [2.1, 1.2]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ function uniqBy(array, iteratee) {
+ return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
+ }
+
+ /**
+ * This method is like `_.uniq` except that it accepts `comparator` which
+ * is invoked to compare elements of `array`. The order of result values is
+ * determined by the order they occur in the array.The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.uniqWith(objects, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
+ */
+ function uniqWith(array, comparator) {
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
+ }
+
+ /**
+ * This method is like `_.zip` except that it accepts an array of grouped
+ * elements and creates an array regrouping the elements to their pre-zip
+ * configuration.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.2.0
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
+ * // => [['a', 1, true], ['b', 2, false]]
+ *
+ * _.unzip(zipped);
+ * // => [['a', 'b'], [1, 2], [true, false]]
+ */
+ function unzip(array) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ var length = 0;
+ array = arrayFilter(array, function(group) {
+ if (isArrayLikeObject(group)) {
+ length = nativeMax(group.length, length);
+ return true;
+ }
+ });
+ return baseTimes(length, function(index) {
+ return arrayMap(array, baseProperty(index));
+ });
+ }
+
+ /**
+ * This method is like `_.unzip` except that it accepts `iteratee` to specify
+ * how regrouped values should be combined. The iteratee is invoked with the
+ * elements of each group: (...group).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.8.0
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @param {Function} [iteratee=_.identity] The function to combine
+ * regrouped values.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
+ * // => [[1, 10, 100], [2, 20, 200]]
+ *
+ * _.unzipWith(zipped, _.add);
+ * // => [3, 30, 300]
+ */
+ function unzipWith(array, iteratee) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ var result = unzip(array);
+ if (iteratee == null) {
+ return result;
+ }
+ return arrayMap(result, function(group) {
+ return apply(iteratee, undefined, group);
+ });
+ }
+
+ /**
+ * Creates an array excluding all given values using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * **Note:** Unlike `_.pull`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...*} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.difference, _.xor
+ * @example
+ *
+ * _.without([2, 1, 2, 3], 1, 2);
+ * // => [3]
+ */
+ var without = baseRest(function(array, values) {
+ return isArrayLikeObject(array)
+ ? baseDifference(array, values)
+ : [];
+ });
+
+ /**
+ * Creates an array of unique values that is the
+ * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
+ * of the given arrays. The order of result values is determined by the order
+ * they occur in the arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.4.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.difference, _.without
+ * @example
+ *
+ * _.xor([2, 1], [2, 3]);
+ * // => [1, 3]
+ */
+ var xor = baseRest(function(arrays) {
+ return baseXor(arrayFilter(arrays, isArrayLikeObject));
+ });
+
+ /**
+ * This method is like `_.xor` except that it accepts `iteratee` which is
+ * invoked for each element of each `arrays` to generate the criterion by
+ * which by which they're compared. The order of result values is determined
+ * by the order they occur in the arrays. The iteratee is invoked with one
+ * argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [1.2, 3.4]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 2 }]
+ */
+ var xorBy = baseRest(function(arrays) {
+ var iteratee = last(arrays);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
+ });
+
+ /**
+ * This method is like `_.xor` except that it accepts `comparator` which is
+ * invoked to compare elements of `arrays`. The order of result values is
+ * determined by the order they occur in the arrays. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.xorWith(objects, others, _.isEqual);
+ * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+ */
+ var xorWith = baseRest(function(arrays) {
+ var comparator = last(arrays);
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
+ });
+
+ /**
+ * Creates an array of grouped elements, the first of which contains the
+ * first elements of the given arrays, the second of which contains the
+ * second elements of the given arrays, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zip(['a', 'b'], [1, 2], [true, false]);
+ * // => [['a', 1, true], ['b', 2, false]]
+ */
+ var zip = baseRest(unzip);
+
+ /**
+ * This method is like `_.fromPairs` except that it accepts two arrays,
+ * one of property identifiers and one of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.4.0
+ * @category Array
+ * @param {Array} [props=[]] The property identifiers.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObject(['a', 'b'], [1, 2]);
+ * // => { 'a': 1, 'b': 2 }
+ */
+ function zipObject(props, values) {
+ return baseZipObject(props || [], values || [], assignValue);
+ }
+
+ /**
+ * This method is like `_.zipObject` except that it supports property paths.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.1.0
+ * @category Array
+ * @param {Array} [props=[]] The property identifiers.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
+ * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
+ */
+ function zipObjectDeep(props, values) {
+ return baseZipObject(props || [], values || [], baseSet);
+ }
+
+ /**
+ * This method is like `_.zip` except that it accepts `iteratee` to specify
+ * how grouped values should be combined. The iteratee is invoked with the
+ * elements of each group: (...group).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.8.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @param {Function} [iteratee=_.identity] The function to combine
+ * grouped values.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
+ * return a + b + c;
+ * });
+ * // => [111, 222]
+ */
+ var zipWith = baseRest(function(arrays) {
+ var length = arrays.length,
+ iteratee = length > 1 ? arrays[length - 1] : undefined;
+
+ iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
+ return unzipWith(arrays, iteratee);
+ });
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a `lodash` wrapper instance that wraps `value` with explicit method
+ * chain sequences enabled. The result of such sequences must be unwrapped
+ * with `_#value`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.3.0
+ * @category Seq
+ * @param {*} value The value to wrap.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'pebbles', 'age': 1 }
+ * ];
+ *
+ * var youngest = _
+ * .chain(users)
+ * .sortBy('age')
+ * .map(function(o) {
+ * return o.user + ' is ' + o.age;
+ * })
+ * .head()
+ * .value();
+ * // => 'pebbles is 1'
+ */
+ function chain(value) {
+ var result = lodash(value);
+ result.__chain__ = true;
+ return result;
+ }
+
+ /**
+ * This method invokes `interceptor` and returns `value`. The interceptor
+ * is invoked with one argument; (value). The purpose of this method is to
+ * "tap into" a method chain sequence in order to modify intermediate results.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @returns {*} Returns `value`.
+ * @example
+ *
+ * _([1, 2, 3])
+ * .tap(function(array) {
+ * // Mutate input array.
+ * array.pop();
+ * })
+ * .reverse()
+ * .value();
+ * // => [2, 1]
+ */
+ function tap(value, interceptor) {
+ interceptor(value);
+ return value;
+ }
+
+ /**
+ * This method is like `_.tap` except that it returns the result of `interceptor`.
+ * The purpose of this method is to "pass thru" values replacing intermediate
+ * results in a method chain sequence.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Seq
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @returns {*} Returns the result of `interceptor`.
+ * @example
+ *
+ * _(' abc ')
+ * .chain()
+ * .trim()
+ * .thru(function(value) {
+ * return [value];
+ * })
+ * .value();
+ * // => ['abc']
+ */
+ function thru(value, interceptor) {
+ return interceptor(value);
+ }
+
+ /**
+ * This method is the wrapper version of `_.at`.
+ *
+ * @name at
+ * @memberOf _
+ * @since 1.0.0
+ * @category Seq
+ * @param {...(string|string[])} [paths] The property paths to pick.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+ *
+ * _(object).at(['a[0].b.c', 'a[1]']).value();
+ * // => [3, 4]
+ */
+ var wrapperAt = flatRest(function(paths) {
+ var length = paths.length,
+ start = length ? paths[0] : 0,
+ value = this.__wrapped__,
+ interceptor = function(object) { return baseAt(object, paths); };
+
+ if (length > 1 || this.__actions__.length ||
+ !(value instanceof LazyWrapper) || !isIndex(start)) {
+ return this.thru(interceptor);
+ }
+ value = value.slice(start, +start + (length ? 1 : 0));
+ value.__actions__.push({
+ 'func': thru,
+ 'args': [interceptor],
+ 'thisArg': undefined
+ });
+ return new LodashWrapper(value, this.__chain__).thru(function(array) {
+ if (length && !array.length) {
+ array.push(undefined);
+ }
+ return array;
+ });
+ });
+
+ /**
+ * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
+ *
+ * @name chain
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * // A sequence without explicit chaining.
+ * _(users).head();
+ * // => { 'user': 'barney', 'age': 36 }
+ *
+ * // A sequence with explicit chaining.
+ * _(users)
+ * .chain()
+ * .head()
+ * .pick('user')
+ * .value();
+ * // => { 'user': 'barney' }
+ */
+ function wrapperChain() {
+ return chain(this);
+ }
+
+ /**
+ * Executes the chain sequence and returns the wrapped result.
+ *
+ * @name commit
+ * @memberOf _
+ * @since 3.2.0
+ * @category Seq
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapped = _(array).push(3);
+ *
+ * console.log(array);
+ * // => [1, 2]
+ *
+ * wrapped = wrapped.commit();
+ * console.log(array);
+ * // => [1, 2, 3]
+ *
+ * wrapped.last();
+ * // => 3
+ *
+ * console.log(array);
+ * // => [1, 2, 3]
+ */
+ function wrapperCommit() {
+ return new LodashWrapper(this.value(), this.__chain__);
+ }
+
+ /**
+ * Gets the next value on a wrapped object following the
+ * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
+ *
+ * @name next
+ * @memberOf _
+ * @since 4.0.0
+ * @category Seq
+ * @returns {Object} Returns the next iterator value.
+ * @example
+ *
+ * var wrapped = _([1, 2]);
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 1 }
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 2 }
+ *
+ * wrapped.next();
+ * // => { 'done': true, 'value': undefined }
+ */
+ function wrapperNext() {
+ if (this.__values__ === undefined) {
+ this.__values__ = toArray(this.value());
+ }
+ var done = this.__index__ >= this.__values__.length,
+ value = done ? undefined : this.__values__[this.__index__++];
+
+ return { 'done': done, 'value': value };
+ }
+
+ /**
+ * Enables the wrapper to be iterable.
+ *
+ * @name Symbol.iterator
+ * @memberOf _
+ * @since 4.0.0
+ * @category Seq
+ * @returns {Object} Returns the wrapper object.
+ * @example
+ *
+ * var wrapped = _([1, 2]);
+ *
+ * wrapped[Symbol.iterator]() === wrapped;
+ * // => true
+ *
+ * Array.from(wrapped);
+ * // => [1, 2]
+ */
+ function wrapperToIterator() {
+ return this;
+ }
+
+ /**
+ * Creates a clone of the chain sequence planting `value` as the wrapped value.
+ *
+ * @name plant
+ * @memberOf _
+ * @since 3.2.0
+ * @category Seq
+ * @param {*} value The value to plant.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var wrapped = _([1, 2]).map(square);
+ * var other = wrapped.plant([3, 4]);
+ *
+ * other.value();
+ * // => [9, 16]
+ *
+ * wrapped.value();
+ * // => [1, 4]
+ */
+ function wrapperPlant(value) {
+ var result,
+ parent = this;
+
+ while (parent instanceof baseLodash) {
+ var clone = wrapperClone(parent);
+ clone.__index__ = 0;
+ clone.__values__ = undefined;
+ if (result) {
+ previous.__wrapped__ = clone;
+ } else {
+ result = clone;
+ }
+ var previous = clone;
+ parent = parent.__wrapped__;
+ }
+ previous.__wrapped__ = value;
+ return result;
+ }
+
+ /**
+ * This method is the wrapper version of `_.reverse`.
+ *
+ * **Note:** This method mutates the wrapped array.
+ *
+ * @name reverse
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _(array).reverse().value()
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+ function wrapperReverse() {
+ var value = this.__wrapped__;
+ if (value instanceof LazyWrapper) {
+ var wrapped = value;
+ if (this.__actions__.length) {
+ wrapped = new LazyWrapper(this);
+ }
+ wrapped = wrapped.reverse();
+ wrapped.__actions__.push({
+ 'func': thru,
+ 'args': [reverse],
+ 'thisArg': undefined
+ });
+ return new LodashWrapper(wrapped, this.__chain__);
+ }
+ return this.thru(reverse);
+ }
+
+ /**
+ * Executes the chain sequence to resolve the unwrapped value.
+ *
+ * @name value
+ * @memberOf _
+ * @since 0.1.0
+ * @alias toJSON, valueOf
+ * @category Seq
+ * @returns {*} Returns the resolved unwrapped value.
+ * @example
+ *
+ * _([1, 2, 3]).value();
+ * // => [1, 2, 3]
+ */
+ function wrapperValue() {
+ return baseWrapperValue(this.__wrapped__, this.__actions__);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the number of times the key was returned by `iteratee`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
+ /**
+ * Checks if `predicate` returns truthy for **all** elements of `collection`.
+ * Iteration is stopped once `predicate` returns falsey. The predicate is
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * **Note:** This method returns `true` for
+ * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
+ * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
+ * elements of empty collections.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`.
+ * @example
+ *
+ * _.every([true, 1, null, 'yes'], Boolean);
+ * // => false
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.every(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.every(users, ['active', false]);
+ * // => true
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.every(users, 'active');
+ * // => false
+ */
+ function every(collection, predicate, guard) {
+ var func = isArray(collection) ? arrayEvery : baseEvery;
+ if (guard && isIterateeCall(collection, predicate, guard)) {
+ predicate = undefined;
+ }
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Iterates over elements of `collection`, returning an array of all elements
+ * `predicate` returns truthy for. The predicate is invoked with three
+ * arguments: (value, index|key, collection).
+ *
+ * **Note:** Unlike `_.remove`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ * @see _.reject
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * _.filter(users, function(o) { return !o.active; });
+ * // => objects for ['fred']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.filter(users, { 'age': 36, 'active': true });
+ * // => objects for ['barney']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.filter(users, ['active', false]);
+ * // => objects for ['fred']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.filter(users, 'active');
+ * // => objects for ['barney']
+ *
+ * // Combining several predicates using `_.overEvery` or `_.overSome`.
+ * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
+ * // => objects for ['fred', 'barney']
+ */
+ function filter(collection, predicate) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Iterates over elements of `collection`, returning the first element
+ * `predicate` returns truthy for. The predicate is invoked with three
+ * arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false },
+ * { 'user': 'pebbles', 'age': 1, 'active': true }
+ * ];
+ *
+ * _.find(users, function(o) { return o.age < 40; });
+ * // => object for 'barney'
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.find(users, { 'age': 1, 'active': true });
+ * // => object for 'pebbles'
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.find(users, ['active', false]);
+ * // => object for 'fred'
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.find(users, 'active');
+ * // => object for 'barney'
+ */
+ var find = createFind(findIndex);
+
+ /**
+ * This method is like `_.find` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=collection.length-1] The index to search from.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * _.findLast([1, 2, 3, 4], function(n) {
+ * return n % 2 == 1;
+ * });
+ * // => 3
+ */
+ var findLast = createFind(findLastIndex);
+
+ /**
+ * Creates a flattened array of values by running each element in `collection`
+ * thru `iteratee` and flattening the mapped results. The iteratee is invoked
+ * with three arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [n, n];
+ * }
+ *
+ * _.flatMap([1, 2], duplicate);
+ * // => [1, 1, 2, 2]
+ */
+ function flatMap(collection, iteratee) {
+ return baseFlatten(map(collection, iteratee), 1);
+ }
+
+ /**
+ * This method is like `_.flatMap` except that it recursively flattens the
+ * mapped results.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.7.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [[[n, n]]];
+ * }
+ *
+ * _.flatMapDeep([1, 2], duplicate);
+ * // => [1, 1, 2, 2]
+ */
+ function flatMapDeep(collection, iteratee) {
+ return baseFlatten(map(collection, iteratee), INFINITY);
+ }
+
+ /**
+ * This method is like `_.flatMap` except that it recursively flattens the
+ * mapped results up to `depth` times.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.7.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {number} [depth=1] The maximum recursion depth.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [[[n, n]]];
+ * }
+ *
+ * _.flatMapDepth([1, 2], duplicate, 2);
+ * // => [[1, 1], [2, 2]]
+ */
+ function flatMapDepth(collection, iteratee, depth) {
+ depth = depth === undefined ? 1 : toInteger(depth);
+ return baseFlatten(map(collection, iteratee), depth);
+ }
+
+ /**
+ * Iterates over elements of `collection` and invokes `iteratee` for each element.
+ * The iteratee is invoked with three arguments: (value, index|key, collection).
+ * Iteratee functions may exit iteration early by explicitly returning `false`.
+ *
+ * **Note:** As with other "Collections" methods, objects with a "length"
+ * property are iterated like arrays. To avoid this behavior use `_.forIn`
+ * or `_.forOwn` for object iteration.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @alias each
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ * @see _.forEachRight
+ * @example
+ *
+ * _.forEach([1, 2], function(value) {
+ * console.log(value);
+ * });
+ * // => Logs `1` then `2`.
+ *
+ * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'a' then 'b' (iteration order is not guaranteed).
+ */
+ function forEach(collection, iteratee) {
+ var func = isArray(collection) ? arrayEach : baseEach;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * This method is like `_.forEach` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @alias eachRight
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ * @see _.forEach
+ * @example
+ *
+ * _.forEachRight([1, 2], function(value) {
+ * console.log(value);
+ * });
+ * // => Logs `2` then `1`.
+ */
+ function forEachRight(collection, iteratee) {
+ var func = isArray(collection) ? arrayEachRight : baseEachRight;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The order of grouped values
+ * is determined by the order they occur in `collection`. The corresponding
+ * value of each key is an array of elements responsible for generating the
+ * key. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.groupBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': [4.2], '6': [6.1, 6.3] }
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.groupBy(['one', 'two', 'three'], 'length');
+ * // => { '3': ['one', 'two'], '5': ['three'] }
+ */
+ var groupBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ result[key].push(value);
+ } else {
+ baseAssignValue(result, key, [value]);
+ }
+ });
+
+ /**
+ * Checks if `value` is in `collection`. If `collection` is a string, it's
+ * checked for a substring of `value`, otherwise
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * is used for equality comparisons. If `fromIndex` is negative, it's used as
+ * the offset from the end of `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
+ * @returns {boolean} Returns `true` if `value` is found, else `false`.
+ * @example
+ *
+ * _.includes([1, 2, 3], 1);
+ * // => true
+ *
+ * _.includes([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * _.includes({ 'a': 1, 'b': 2 }, 1);
+ * // => true
+ *
+ * _.includes('abcd', 'bc');
+ * // => true
+ */
+ function includes(collection, value, fromIndex, guard) {
+ collection = isArrayLike(collection) ? collection : values(collection);
+ fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
+
+ var length = collection.length;
+ if (fromIndex < 0) {
+ fromIndex = nativeMax(length + fromIndex, 0);
+ }
+ return isString(collection)
+ ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
+ : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
+ }
+
+ /**
+ * Invokes the method at `path` of each element in `collection`, returning
+ * an array of the results of each invoked method. Any additional arguments
+ * are provided to each invoked method. If `path` is a function, it's invoked
+ * for, and `this` bound to, each element in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Array|Function|string} path The path of the method to invoke or
+ * the function invoked per iteration.
+ * @param {...*} [args] The arguments to invoke each method with.
+ * @returns {Array} Returns the array of results.
+ * @example
+ *
+ * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
+ * // => [[1, 5, 7], [1, 2, 3]]
+ *
+ * _.invokeMap([123, 456], String.prototype.split, '');
+ * // => [['1', '2', '3'], ['4', '5', '6']]
+ */
+ var invokeMap = baseRest(function(collection, path, args) {
+ var index = -1,
+ isFunc = typeof path == 'function',
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value) {
+ result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
+ });
+ return result;
+ });
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` thru `iteratee`. The corresponding value of
+ * each key is the last element responsible for generating the key. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * var array = [
+ * { 'dir': 'left', 'code': 97 },
+ * { 'dir': 'right', 'code': 100 }
+ * ];
+ *
+ * _.keyBy(array, function(o) {
+ * return String.fromCharCode(o.code);
+ * });
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.keyBy(array, 'dir');
+ * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+ */
+ var keyBy = createAggregator(function(result, value, key) {
+ baseAssignValue(result, key, value);
+ });
+
+ /**
+ * Creates an array of values by running each element in `collection` thru
+ * `iteratee`. The iteratee is invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
+ *
+ * The guarded methods are:
+ * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
+ * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
+ * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
+ * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * _.map([4, 8], square);
+ * // => [16, 64]
+ *
+ * _.map({ 'a': 4, 'b': 8 }, square);
+ * // => [16, 64] (iteration order is not guaranteed)
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.map(users, 'user');
+ * // => ['barney', 'fred']
+ */
+ function map(collection, iteratee) {
+ var func = isArray(collection) ? arrayMap : baseMap;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * This method is like `_.sortBy` except that it allows specifying the sort
+ * orders of the iteratees to sort by. If `orders` is unspecified, all values
+ * are sorted in ascending order. Otherwise, specify an order of "desc" for
+ * descending or "asc" for ascending sort order of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
+ * The iteratees to sort by.
+ * @param {string[]} [orders] The sort orders of `iteratees`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 34 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'barney', 'age': 36 }
+ * ];
+ *
+ * // Sort by `user` in ascending order and by `age` in descending order.
+ * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
+ * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
+ */
+ function orderBy(collection, iteratees, orders, guard) {
+ if (collection == null) {
+ return [];
+ }
+ if (!isArray(iteratees)) {
+ iteratees = iteratees == null ? [] : [iteratees];
+ }
+ orders = guard ? undefined : orders;
+ if (!isArray(orders)) {
+ orders = orders == null ? [] : [orders];
+ }
+ return baseOrderBy(collection, iteratees, orders);
+ }
+
+ /**
+ * Creates an array of elements split into two groups, the first of which
+ * contains elements `predicate` returns truthy for, the second of which
+ * contains elements `predicate` returns falsey for. The predicate is
+ * invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the array of grouped elements.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true },
+ * { 'user': 'pebbles', 'age': 1, 'active': false }
+ * ];
+ *
+ * _.partition(users, function(o) { return o.active; });
+ * // => objects for [['fred'], ['barney', 'pebbles']]
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.partition(users, { 'age': 1, 'active': false });
+ * // => objects for [['pebbles'], ['barney', 'fred']]
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.partition(users, ['active', false]);
+ * // => objects for [['barney', 'pebbles'], ['fred']]
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.partition(users, 'active');
+ * // => objects for [['fred'], ['barney', 'pebbles']]
+ */
+ var partition = createAggregator(function(result, value, key) {
+ result[key ? 0 : 1].push(value);
+ }, function() { return [[], []]; });
+
+ /**
+ * Reduces `collection` to a value which is the accumulated result of running
+ * each element in `collection` thru `iteratee`, where each successive
+ * invocation is supplied the return value of the previous. If `accumulator`
+ * is not given, the first element of `collection` is used as the initial
+ * value. The iteratee is invoked with four arguments:
+ * (accumulator, value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * `_.reduce`, `_.reduceRight`, and `_.transform`.
+ *
+ * The guarded methods are:
+ * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
+ * and `sortBy`
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @returns {*} Returns the accumulated value.
+ * @see _.reduceRight
+ * @example
+ *
+ * _.reduce([1, 2], function(sum, n) {
+ * return sum + n;
+ * }, 0);
+ * // => 3
+ *
+ * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+ * (result[value] || (result[value] = [])).push(key);
+ * return result;
+ * }, {});
+ * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
+ */
+ function reduce(collection, iteratee, accumulator) {
+ var func = isArray(collection) ? arrayReduce : baseReduce,
+ initAccum = arguments.length < 3;
+
+ return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
+ }
+
+ /**
+ * This method is like `_.reduce` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @returns {*} Returns the accumulated value.
+ * @see _.reduce
+ * @example
+ *
+ * var array = [[0, 1], [2, 3], [4, 5]];
+ *
+ * _.reduceRight(array, function(flattened, other) {
+ * return flattened.concat(other);
+ * }, []);
+ * // => [4, 5, 2, 3, 0, 1]
+ */
+ function reduceRight(collection, iteratee, accumulator) {
+ var func = isArray(collection) ? arrayReduceRight : baseReduce,
+ initAccum = arguments.length < 3;
+
+ return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
+ }
+
+ /**
+ * The opposite of `_.filter`; this method returns the elements of `collection`
+ * that `predicate` does **not** return truthy for.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ * @see _.filter
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true }
+ * ];
+ *
+ * _.reject(users, function(o) { return !o.active; });
+ * // => objects for ['fred']
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.reject(users, { 'age': 40, 'active': true });
+ * // => objects for ['barney']
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.reject(users, ['active', false]);
+ * // => objects for ['fred']
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.reject(users, 'active');
+ * // => objects for ['barney']
+ */
+ function reject(collection, predicate) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ return func(collection, negate(getIteratee(predicate, 3)));
+ }
+
+ /**
+ * Gets a random element from `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to sample.
+ * @returns {*} Returns the random element.
+ * @example
+ *
+ * _.sample([1, 2, 3, 4]);
+ * // => 2
+ */
+ function sample(collection) {
+ var func = isArray(collection) ? arraySample : baseSample;
+ return func(collection);
+ }
+
+ /**
+ * Gets `n` random elements at unique keys from `collection` up to the
+ * size of `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to sample.
+ * @param {number} [n=1] The number of elements to sample.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Array} Returns the random elements.
+ * @example
+ *
+ * _.sampleSize([1, 2, 3], 2);
+ * // => [3, 1]
+ *
+ * _.sampleSize([1, 2, 3], 4);
+ * // => [2, 3, 1]
+ */
+ function sampleSize(collection, n, guard) {
+ if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
+ n = 1;
+ } else {
+ n = toInteger(n);
+ }
+ var func = isArray(collection) ? arraySampleSize : baseSampleSize;
+ return func(collection, n);
+ }
+
+ /**
+ * Creates an array of shuffled values, using a version of the
+ * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ * @example
+ *
+ * _.shuffle([1, 2, 3, 4]);
+ * // => [4, 1, 3, 2]
+ */
+ function shuffle(collection) {
+ var func = isArray(collection) ? arrayShuffle : baseShuffle;
+ return func(collection);
+ }
+
+ /**
+ * Gets the size of `collection` by returning its length for array-like
+ * values or the number of own enumerable string keyed properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @returns {number} Returns the collection size.
+ * @example
+ *
+ * _.size([1, 2, 3]);
+ * // => 3
+ *
+ * _.size({ 'a': 1, 'b': 2 });
+ * // => 2
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+ function size(collection) {
+ if (collection == null) {
+ return 0;
+ }
+ if (isArrayLike(collection)) {
+ return isString(collection) ? stringSize(collection) : collection.length;
+ }
+ var tag = getTag(collection);
+ if (tag == mapTag || tag == setTag) {
+ return collection.size;
+ }
+ return baseKeys(collection).length;
+ }
+
+ /**
+ * Checks if `predicate` returns truthy for **any** element of `collection`.
+ * Iteration is stopped once `predicate` returns truthy. The predicate is
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ * @example
+ *
+ * _.some([null, 0, 'yes', false], Boolean);
+ * // => true
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false }
+ * ];
+ *
+ * // The `_.matches` iteratee shorthand.
+ * _.some(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // The `_.matchesProperty` iteratee shorthand.
+ * _.some(users, ['active', false]);
+ * // => true
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.some(users, 'active');
+ * // => true
+ */
+ function some(collection, predicate, guard) {
+ var func = isArray(collection) ? arraySome : baseSome;
+ if (guard && isIterateeCall(collection, predicate, guard)) {
+ predicate = undefined;
+ }
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Creates an array of elements, sorted in ascending order by the results of
+ * running each element in a collection thru each iteratee. This method
+ * performs a stable sort, that is, it preserves the original sort order of
+ * equal elements. The iteratees are invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {...(Function|Function[])} [iteratees=[_.identity]]
+ * The iteratees to sort by.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 30 },
+ * { 'user': 'barney', 'age': 34 }
+ * ];
+ *
+ * _.sortBy(users, [function(o) { return o.user; }]);
+ * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
+ *
+ * _.sortBy(users, ['user', 'age']);
+ * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
+ */
+ var sortBy = baseRest(function(collection, iteratees) {
+ if (collection == null) {
+ return [];
+ }
+ var length = iteratees.length;
+ if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
+ iteratees = [];
+ } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
+ iteratees = [iteratees[0]];
+ }
+ return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
+ });
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Gets the timestamp of the number of milliseconds that have elapsed since
+ * the Unix epoch (1 January 1970 00:00:00 UTC).
+ *
+ * @static
+ * @memberOf _
+ * @since 2.4.0
+ * @category Date
+ * @returns {number} Returns the timestamp.
+ * @example
+ *
+ * _.defer(function(stamp) {
+ * console.log(_.now() - stamp);
+ * }, _.now());
+ * // => Logs the number of milliseconds it took for the deferred invocation.
+ */
+ var now = ctxNow || function() {
+ return root.Date.now();
+ };
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * The opposite of `_.before`; this method creates a function that invokes
+ * `func` once it's called `n` or more times.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {number} n The number of calls before `func` is invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var saves = ['profile', 'settings'];
+ *
+ * var done = _.after(saves.length, function() {
+ * console.log('done saving!');
+ * });
+ *
+ * _.forEach(saves, function(type) {
+ * asyncSave({ 'type': type, 'complete': done });
+ * });
+ * // => Logs 'done saving!' after the two async saves have completed.
+ */
+ function after(n, func) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ n = toInteger(n);
+ return function() {
+ if (--n < 1) {
+ return func.apply(this, arguments);
+ }
+ };
+ }
+
+ /**
+ * Creates a function that invokes `func`, with up to `n` arguments,
+ * ignoring any additional arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to cap arguments for.
+ * @param {number} [n=func.length] The arity cap.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Function} Returns the new capped function.
+ * @example
+ *
+ * _.map(['6', '8', '10'], _.ary(parseInt, 1));
+ * // => [6, 8, 10]
+ */
+ function ary(func, n, guard) {
+ n = guard ? undefined : n;
+ n = (func && n == null) ? func.length : n;
+ return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
+ }
+
+ /**
+ * Creates a function that invokes `func`, with the `this` binding and arguments
+ * of the created function, while it's called less than `n` times. Subsequent
+ * calls to the created function return the result of the last `func` invocation.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {number} n The number of calls at which `func` is no longer invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * jQuery(element).on('click', _.before(5, addContactToList));
+ * // => Allows adding up to 4 contacts to the list.
+ */
+ function before(n, func) {
+ var result;
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ n = toInteger(n);
+ return function() {
+ if (--n > 0) {
+ result = func.apply(this, arguments);
+ }
+ if (n <= 1) {
+ func = undefined;
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of `thisArg`
+ * and `partials` prepended to the arguments it receives.
+ *
+ * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
+ * may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
+ * property of bound functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * function greet(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * }
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * var bound = _.bind(greet, object, 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * // Bound with placeholders.
+ * var bound = _.bind(greet, object, _, '!');
+ * bound('hi');
+ * // => 'hi fred!'
+ */
+ var bind = baseRest(function(func, thisArg, partials) {
+ var bitmask = WRAP_BIND_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, getHolder(bind));
+ bitmask |= WRAP_PARTIAL_FLAG;
+ }
+ return createWrap(func, bitmask, thisArg, partials, holders);
+ });
+
+ /**
+ * Creates a function that invokes the method at `object[key]` with `partials`
+ * prepended to the arguments it receives.
+ *
+ * This method differs from `_.bind` by allowing bound functions to reference
+ * methods that may be redefined or don't yet exist. See
+ * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
+ * for more details.
+ *
+ * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.10.0
+ * @category Function
+ * @param {Object} object The object to invoke the method on.
+ * @param {string} key The key of the method.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var object = {
+ * 'user': 'fred',
+ * 'greet': function(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * }
+ * };
+ *
+ * var bound = _.bindKey(object, 'greet', 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * object.greet = function(greeting, punctuation) {
+ * return greeting + 'ya ' + this.user + punctuation;
+ * };
+ *
+ * bound('!');
+ * // => 'hiya fred!'
+ *
+ * // Bound with placeholders.
+ * var bound = _.bindKey(object, 'greet', _, '!');
+ * bound('hi');
+ * // => 'hiya fred!'
+ */
+ var bindKey = baseRest(function(object, key, partials) {
+ var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, getHolder(bindKey));
+ bitmask |= WRAP_PARTIAL_FLAG;
+ }
+ return createWrap(key, bitmask, object, partials, holders);
+ });
+
+ /**
+ * Creates a function that accepts arguments of `func` and either invokes
+ * `func` returning its result, if at least `arity` number of arguments have
+ * been provided, or returns a function that accepts the remaining `func`
+ * arguments, and so on. The arity of `func` may be specified if `func.length`
+ * is not sufficient.
+ *
+ * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
+ * may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method doesn't set the "length" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of `func`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curry(abc);
+ *
+ * curried(1)(2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // Curried with placeholders.
+ * curried(1)(_, 3)(2);
+ * // => [1, 2, 3]
+ */
+ function curry(func, arity, guard) {
+ arity = guard ? undefined : arity;
+ var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+ result.placeholder = curry.placeholder;
+ return result;
+ }
+
+ /**
+ * This method is like `_.curry` except that arguments are applied to `func`
+ * in the manner of `_.partialRight` instead of `_.partial`.
+ *
+ * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method doesn't set the "length" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of `func`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curryRight(abc);
+ *
+ * curried(3)(2)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(2, 3)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // Curried with placeholders.
+ * curried(3)(1, _)(2);
+ * // => [1, 2, 3]
+ */
+ function curryRight(func, arity, guard) {
+ arity = guard ? undefined : arity;
+ var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+ result.placeholder = curryRight.placeholder;
+ return result;
+ }
+
+ /**
+ * Creates a debounced function that delays invoking `func` until after `wait`
+ * milliseconds have elapsed since the last time the debounced function was
+ * invoked. The debounced function comes with a `cancel` method to cancel
+ * delayed `func` invocations and a `flush` method to immediately invoke them.
+ * Provide `options` to indicate whether `func` should be invoked on the
+ * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
+ * with the last arguments provided to the debounced function. Subsequent
+ * calls to the debounced function return the result of the last `func`
+ * invocation.
+ *
+ * **Note:** If `leading` and `trailing` options are `true`, `func` is
+ * invoked on the trailing edge of the timeout only if the debounced function
+ * is invoked more than once during the `wait` timeout.
+ *
+ * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+ * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+ *
+ * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+ * for details over the differences between `_.debounce` and `_.throttle`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to debounce.
+ * @param {number} [wait=0] The number of milliseconds to delay.
+ * @param {Object} [options={}] The options object.
+ * @param {boolean} [options.leading=false]
+ * Specify invoking on the leading edge of the timeout.
+ * @param {number} [options.maxWait]
+ * The maximum time `func` is allowed to be delayed before it's invoked.
+ * @param {boolean} [options.trailing=true]
+ * Specify invoking on the trailing edge of the timeout.
+ * @returns {Function} Returns the new debounced function.
+ * @example
+ *
+ * // Avoid costly calculations while the window size is in flux.
+ * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
+ *
+ * // Invoke `sendMail` when clicked, debouncing subsequent calls.
+ * jQuery(element).on('click', _.debounce(sendMail, 300, {
+ * 'leading': true,
+ * 'trailing': false
+ * }));
+ *
+ * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
+ * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
+ * var source = new EventSource('/stream');
+ * jQuery(source).on('message', debounced);
+ *
+ * // Cancel the trailing debounced invocation.
+ * jQuery(window).on('popstate', debounced.cancel);
+ */
+ function debounce(func, wait, options) {
+ var lastArgs,
+ lastThis,
+ maxWait,
+ result,
+ timerId,
+ lastCallTime,
+ lastInvokeTime = 0,
+ leading = false,
+ maxing = false,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ wait = toNumber(wait) || 0;
+ if (isObject(options)) {
+ leading = !!options.leading;
+ maxing = 'maxWait' in options;
+ maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+
+ function invokeFunc(time) {
+ var args = lastArgs,
+ thisArg = lastThis;
+
+ lastArgs = lastThis = undefined;
+ lastInvokeTime = time;
+ result = func.apply(thisArg, args);
+ return result;
+ }
+
+ function leadingEdge(time) {
+ // Reset any `maxWait` timer.
+ lastInvokeTime = time;
+ // Start the timer for the trailing edge.
+ timerId = setTimeout(timerExpired, wait);
+ // Invoke the leading edge.
+ return leading ? invokeFunc(time) : result;
+ }
+
+ function remainingWait(time) {
+ var timeSinceLastCall = time - lastCallTime,
+ timeSinceLastInvoke = time - lastInvokeTime,
+ timeWaiting = wait - timeSinceLastCall;
+
+ return maxing
+ ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
+ : timeWaiting;
+ }
+
+ function shouldInvoke(time) {
+ var timeSinceLastCall = time - lastCallTime,
+ timeSinceLastInvoke = time - lastInvokeTime;
+
+ // Either this is the first call, activity has stopped and we're at the
+ // trailing edge, the system time has gone backwards and we're treating
+ // it as the trailing edge, or we've hit the `maxWait` limit.
+ return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
+ (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
+ }
+
+ function timerExpired() {
+ var time = now();
+ if (shouldInvoke(time)) {
+ return trailingEdge(time);
+ }
+ // Restart the timer.
+ timerId = setTimeout(timerExpired, remainingWait(time));
+ }
+
+ function trailingEdge(time) {
+ timerId = undefined;
+
+ // Only invoke if we have `lastArgs` which means `func` has been
+ // debounced at least once.
+ if (trailing && lastArgs) {
+ return invokeFunc(time);
+ }
+ lastArgs = lastThis = undefined;
+ return result;
+ }
+
+ function cancel() {
+ if (timerId !== undefined) {
+ clearTimeout(timerId);
+ }
+ lastInvokeTime = 0;
+ lastArgs = lastCallTime = lastThis = timerId = undefined;
+ }
+
+ function flush() {
+ return timerId === undefined ? result : trailingEdge(now());
+ }
+
+ function debounced() {
+ var time = now(),
+ isInvoking = shouldInvoke(time);
+
+ lastArgs = arguments;
+ lastThis = this;
+ lastCallTime = time;
+
+ if (isInvoking) {
+ if (timerId === undefined) {
+ return leadingEdge(lastCallTime);
+ }
+ if (maxing) {
+ // Handle invocations in a tight loop.
+ clearTimeout(timerId);
+ timerId = setTimeout(timerExpired, wait);
+ return invokeFunc(lastCallTime);
+ }
+ }
+ if (timerId === undefined) {
+ timerId = setTimeout(timerExpired, wait);
+ }
+ return result;
+ }
+ debounced.cancel = cancel;
+ debounced.flush = flush;
+ return debounced;
+ }
+
+ /**
+ * Defers invoking the `func` until the current call stack has cleared. Any
+ * additional arguments are provided to `func` when it's invoked.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to defer.
+ * @param {...*} [args] The arguments to invoke `func` with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.defer(function(text) {
+ * console.log(text);
+ * }, 'deferred');
+ * // => Logs 'deferred' after one millisecond.
+ */
+ var defer = baseRest(function(func, args) {
+ return baseDelay(func, 1, args);
+ });
+
+ /**
+ * Invokes `func` after `wait` milliseconds. Any additional arguments are
+ * provided to `func` when it's invoked.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {...*} [args] The arguments to invoke `func` with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.delay(function(text) {
+ * console.log(text);
+ * }, 1000, 'later');
+ * // => Logs 'later' after one second.
+ */
+ var delay = baseRest(function(func, wait, args) {
+ return baseDelay(func, toNumber(wait) || 0, args);
+ });
+
+ /**
+ * Creates a function that invokes `func` with arguments reversed.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to flip arguments for.
+ * @returns {Function} Returns the new flipped function.
+ * @example
+ *
+ * var flipped = _.flip(function() {
+ * return _.toArray(arguments);
+ * });
+ *
+ * flipped('a', 'b', 'c', 'd');
+ * // => ['d', 'c', 'b', 'a']
+ */
+ function flip(func) {
+ return createWrap(func, WRAP_FLIP_FLAG);
+ }
+
+ /**
+ * Creates a function that memoizes the result of `func`. If `resolver` is
+ * provided, it determines the cache key for storing the result based on the
+ * arguments provided to the memoized function. By default, the first argument
+ * provided to the memoized function is used as the map cache key. The `func`
+ * is invoked with the `this` binding of the memoized function.
+ *
+ * **Note:** The cache is exposed as the `cache` property on the memoized
+ * function. Its creation may be customized by replacing the `_.memoize.Cache`
+ * constructor with one whose instances implement the
+ * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
+ * method interface of `clear`, `delete`, `get`, `has`, and `set`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to have its output memoized.
+ * @param {Function} [resolver] The function to resolve the cache key.
+ * @returns {Function} Returns the new memoized function.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2 };
+ * var other = { 'c': 3, 'd': 4 };
+ *
+ * var values = _.memoize(_.values);
+ * values(object);
+ * // => [1, 2]
+ *
+ * values(other);
+ * // => [3, 4]
+ *
+ * object.a = 2;
+ * values(object);
+ * // => [1, 2]
+ *
+ * // Modify the result cache.
+ * values.cache.set(object, ['a', 'b']);
+ * values(object);
+ * // => ['a', 'b']
+ *
+ * // Replace `_.memoize.Cache`.
+ * _.memoize.Cache = WeakMap;
+ */
+ function memoize(func, resolver) {
+ if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var memoized = function() {
+ var args = arguments,
+ key = resolver ? resolver.apply(this, args) : args[0],
+ cache = memoized.cache;
+
+ if (cache.has(key)) {
+ return cache.get(key);
+ }
+ var result = func.apply(this, args);
+ memoized.cache = cache.set(key, result) || cache;
+ return result;
+ };
+ memoized.cache = new (memoize.Cache || MapCache);
+ return memoized;
+ }
+
+ // Expose `MapCache`.
+ memoize.Cache = MapCache;
+
+ /**
+ * Creates a function that negates the result of the predicate `func`. The
+ * `func` predicate is invoked with the `this` binding and arguments of the
+ * created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} predicate The predicate to negate.
+ * @returns {Function} Returns the new negated function.
+ * @example
+ *
+ * function isEven(n) {
+ * return n % 2 == 0;
+ * }
+ *
+ * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
+ * // => [1, 3, 5]
+ */
+ function negate(predicate) {
+ if (typeof predicate != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return function() {
+ var args = arguments;
+ switch (args.length) {
+ case 0: return !predicate.call(this);
+ case 1: return !predicate.call(this, args[0]);
+ case 2: return !predicate.call(this, args[0], args[1]);
+ case 3: return !predicate.call(this, args[0], args[1], args[2]);
+ }
+ return !predicate.apply(this, args);
+ };
+ }
+
+ /**
+ * Creates a function that is restricted to invoking `func` once. Repeat calls
+ * to the function return the value of the first invocation. The `func` is
+ * invoked with the `this` binding and arguments of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var initialize = _.once(createApplication);
+ * initialize();
+ * initialize();
+ * // => `createApplication` is invoked once
+ */
+ function once(func) {
+ return before(2, func);
+ }
+
+ /**
+ * Creates a function that invokes `func` with its arguments transformed.
+ *
+ * @static
+ * @since 4.0.0
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to wrap.
+ * @param {...(Function|Function[])} [transforms=[_.identity]]
+ * The argument transforms.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function doubled(n) {
+ * return n * 2;
+ * }
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var func = _.overArgs(function(x, y) {
+ * return [x, y];
+ * }, [square, doubled]);
+ *
+ * func(9, 3);
+ * // => [81, 6]
+ *
+ * func(10, 5);
+ * // => [100, 10]
+ */
+ var overArgs = castRest(function(func, transforms) {
+ transforms = (transforms.length == 1 && isArray(transforms[0]))
+ ? arrayMap(transforms[0], baseUnary(getIteratee()))
+ : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
+
+ var funcsLength = transforms.length;
+ return baseRest(function(args) {
+ var index = -1,
+ length = nativeMin(args.length, funcsLength);
+
+ while (++index < length) {
+ args[index] = transforms[index].call(this, args[index]);
+ }
+ return apply(func, this, args);
+ });
+ });
+
+ /**
+ * Creates a function that invokes `func` with `partials` prepended to the
+ * arguments it receives. This method is like `_.bind` except it does **not**
+ * alter the `this` binding.
+ *
+ * The `_.partial.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method doesn't set the "length" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.2.0
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * function greet(greeting, name) {
+ * return greeting + ' ' + name;
+ * }
+ *
+ * var sayHelloTo = _.partial(greet, 'hello');
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ *
+ * // Partially applied with placeholders.
+ * var greetFred = _.partial(greet, _, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ */
+ var partial = baseRest(function(func, partials) {
+ var holders = replaceHolders(partials, getHolder(partial));
+ return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
+ });
+
+ /**
+ * This method is like `_.partial` except that partially applied arguments
+ * are appended to the arguments it receives.
+ *
+ * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method doesn't set the "length" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.0.0
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * function greet(greeting, name) {
+ * return greeting + ' ' + name;
+ * }
+ *
+ * var greetFred = _.partialRight(greet, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ *
+ * // Partially applied with placeholders.
+ * var sayHelloTo = _.partialRight(greet, 'hello', _);
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ */
+ var partialRight = baseRest(function(func, partials) {
+ var holders = replaceHolders(partials, getHolder(partialRight));
+ return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
+ });
+
+ /**
+ * Creates a function that invokes `func` with arguments arranged according
+ * to the specified `indexes` where the argument value at the first index is
+ * provided as the first argument, the argument value at the second index is
+ * provided as the second argument, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to rearrange arguments for.
+ * @param {...(number|number[])} indexes The arranged argument indexes.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var rearged = _.rearg(function(a, b, c) {
+ * return [a, b, c];
+ * }, [2, 0, 1]);
+ *
+ * rearged('b', 'c', 'a')
+ * // => ['a', 'b', 'c']
+ */
+ var rearg = flatRest(function(func, indexes) {
+ return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
+ });
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of the
+ * created function and arguments from `start` and beyond provided as
+ * an array.
+ *
+ * **Note:** This method is based on the
+ * [rest parameter](https://mdn.io/rest_parameters).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.rest(function(what, names) {
+ * return what + ' ' + _.initial(names).join(', ') +
+ * (_.size(names) > 1 ? ', & ' : '') + _.last(names);
+ * });
+ *
+ * say('hello', 'fred', 'barney', 'pebbles');
+ * // => 'hello fred, barney, & pebbles'
+ */
+ function rest(func, start) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ start = start === undefined ? start : toInteger(start);
+ return baseRest(func, start);
+ }
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of the
+ * create function and an array of arguments much like
+ * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
+ *
+ * **Note:** This method is based on the
+ * [spread operator](https://mdn.io/spread_operator).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.2.0
+ * @category Function
+ * @param {Function} func The function to spread arguments over.
+ * @param {number} [start=0] The start position of the spread.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.spread(function(who, what) {
+ * return who + ' says ' + what;
+ * });
+ *
+ * say(['fred', 'hello']);
+ * // => 'fred says hello'
+ *
+ * var numbers = Promise.all([
+ * Promise.resolve(40),
+ * Promise.resolve(36)
+ * ]);
+ *
+ * numbers.then(_.spread(function(x, y) {
+ * return x + y;
+ * }));
+ * // => a Promise of 76
+ */
+ function spread(func, start) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ start = start == null ? 0 : nativeMax(toInteger(start), 0);
+ return baseRest(function(args) {
+ var array = args[start],
+ otherArgs = castSlice(args, 0, start);
+
+ if (array) {
+ arrayPush(otherArgs, array);
+ }
+ return apply(func, this, otherArgs);
+ });
+ }
+
+ /**
+ * Creates a throttled function that only invokes `func` at most once per
+ * every `wait` milliseconds. The throttled function comes with a `cancel`
+ * method to cancel delayed `func` invocations and a `flush` method to
+ * immediately invoke them. Provide `options` to indicate whether `func`
+ * should be invoked on the leading and/or trailing edge of the `wait`
+ * timeout. The `func` is invoked with the last arguments provided to the
+ * throttled function. Subsequent calls to the throttled function return the
+ * result of the last `func` invocation.
+ *
+ * **Note:** If `leading` and `trailing` options are `true`, `func` is
+ * invoked on the trailing edge of the timeout only if the throttled function
+ * is invoked more than once during the `wait` timeout.
+ *
+ * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+ * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+ *
+ * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+ * for details over the differences between `_.throttle` and `_.debounce`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to throttle.
+ * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
+ * @param {Object} [options={}] The options object.
+ * @param {boolean} [options.leading=true]
+ * Specify invoking on the leading edge of the timeout.
+ * @param {boolean} [options.trailing=true]
+ * Specify invoking on the trailing edge of the timeout.
+ * @returns {Function} Returns the new throttled function.
+ * @example
+ *
+ * // Avoid excessively updating the position while scrolling.
+ * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
+ *
+ * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
+ * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
+ * jQuery(element).on('click', throttled);
+ *
+ * // Cancel the trailing throttled invocation.
+ * jQuery(window).on('popstate', throttled.cancel);
+ */
+ function throttle(func, wait, options) {
+ var leading = true,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (isObject(options)) {
+ leading = 'leading' in options ? !!options.leading : leading;
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+ return debounce(func, wait, {
+ 'leading': leading,
+ 'maxWait': wait,
+ 'trailing': trailing
+ });
+ }
+
+ /**
+ * Creates a function that accepts up to one argument, ignoring any
+ * additional arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to cap arguments for.
+ * @returns {Function} Returns the new capped function.
+ * @example
+ *
+ * _.map(['6', '8', '10'], _.unary(parseInt));
+ * // => [6, 8, 10]
+ */
+ function unary(func) {
+ return ary(func, 1);
+ }
+
+ /**
+ * Creates a function that provides `value` to `wrapper` as its first
+ * argument. Any additional arguments provided to the function are appended
+ * to those provided to the `wrapper`. The wrapper is invoked with the `this`
+ * binding of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {*} value The value to wrap.
+ * @param {Function} [wrapper=identity] The wrapper function.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var p = _.wrap(_.escape, function(func, text) {
+ * return '
+
+ Example dataset for RO-Crate specification
+ + + + +
+
+
+
+
+
+ | @id | +./ | +
|---|---|
| name [?] | +Example dataset for RO-Crate specification | +
| @type | +
|
+
| description [?] | +Official rainfall readings for Katoomba, NSW 2022, Australia | +
| datePublished [?] | +2023-05-22T12:03:00+0100 | +
| author [?] | +Josiah Carberry | +
| hasPart [?] | +Rainfall Katoomba 2022-02 | +
| license [?] | +CC0-1.0 | +
| publisher [?] | +Brown University | +
| Items that reference this one | |
| about [?] | +ro-crate-metadata.json | +
+
+
+ Go to: Josiah Carberry
+ + + + +
+
+
+
+
+
+ | @id | +https://orcid.org/0000-0002-1825-0097 | +
|---|---|
| name [?] | +Josiah Carberry | +
| @type | +Person | +
| affiliation [?] | +Brown University | +
| Items that reference this one | |
| author [?] | +Example dataset for RO-Crate specification | +
+
+
+ ⬇️ Download: Rainfall Katoomba 2022-02
+ + + + +
+
+
+
+
+
+ | @id | +data.csv | +
|---|---|
| name [?] | +Rainfall Katoomba 2022-02 | +
| @type | +File | +
| description [?] | +Rainfall data for Katoomba, NSW Australia February 2022 | +
| encodingFormat [?] | +text/csv | +
| license [?] | +CC BY-NC-SA 4.0 International | +
| Items that reference this one | |
| hasPart [?] | +Example dataset for RO-Crate specification | +
+
+
+ Go to: CC0-1.0
+ + + + +
+
+
+
+
+
+ | @id | +http://spdx.org/licenses/CC0-1.0 | +
|---|---|
| name [?] | +CC0-1.0 | +
| @type | +CreativeWork | +
| description [?] | +Creative Commons Zero v1.0 Universal | +
| url [?] | +https://creativecommons.org/publicdomain/zero/1.0/ | +
| Items that reference this one | |
| license [?] | +Example dataset for RO-Crate specification | +
+
+
+ Go to: Brown University
+ + + + +
+
+
+
+
+
+ | @id | +https://ror.org/05gq02987 | +
|---|---|
| name [?] | +Brown University | +
| @type | +Organization | +
| url [?] | +http://www.brown.edu/ | +
| Items that reference this one | |
| publisher [?] | +Example dataset for RO-Crate specification | +
| affiliation [?] | +Josiah Carberry | +
+ +
+
+ +
+
+
+
+
+
+
+
diff --git a/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/bootstrap.min.css b/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/bootstrap.min.css
new file mode 100644
index 0000000000000..e6b4977799e3a
--- /dev/null
+++ b/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/bootstrap.min.css
@@ -0,0 +1,7 @@
+/*!
+ * Bootstrap v4.2.1 (https://getbootstrap.com/)
+ * Copyright 2011-2018 The Bootstrap Authors
+ * Copyright 2011-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */:root{--blue:#007bff;--indigo:#6610f2;--purple:#6f42c1;--pink:#e83e8c;--red:#dc3545;--orange:#fd7e14;--yellow:#ffc107;--green:#28a745;--teal:#20c997;--cyan:#17a2b8;--white:#fff;--gray:#6c757d;--gray-dark:#343a40;--primary:#007bff;--secondary:#6c757d;--success:#28a745;--info:#17a2b8;--warning:#ffc107;--danger:#dc3545;--light:#f8f9fa;--dark:#343a40;--breakpoint-xs:0;--breakpoint-sm:576px;--breakpoint-md:768px;--breakpoint-lg:992px;--breakpoint-xl:1200px;--font-family-sans-serif:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";--font-family-monospace:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier 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diff --git a/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/ro-crate-dynamic.js b/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/ro-crate-dynamic.js
new file mode 100644
index 0000000000000..1cff39b7a467a
--- /dev/null
+++ b/topics/fair/tutorials/ro-crate-intro/rainfall-1.2.1/ro-crate-preview_files/ro-crate-dynamic.js
@@ -0,0 +1,34026 @@
+(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;iGo to: CC BY-NC-SA 4.0 International
+ + +
+
+
+
+
+
+ | @id | +https://creativecommons.org/licenses/by-nc-sa/4.0/ | +
|---|---|
| name [?] | +CC BY-NC-SA 4.0 International | +
| @type | +CreativeWork | +
| description [?] | +Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International | +
| Items that reference this one | |
| license [?] | +Rainfall Katoomba 2022-02 | +
+ +
+
+ +
+⬇️ Download: ro-crate-metadata.json
+ + +
+
+
+
+
+
+ | @id | +ro-crate-metadata.json | +
|---|---|
| @type | +CreativeWork | +
| conformsTo [?] | +https://w3id.org/ro/crate/1.1 | +
| about [?] | +Example dataset for RO-Crate specification | +
+ +
${checker.summarize()}
${checker.report()}
+ ${this.header(item)}
+ ${this.image(item)}
+ ${this.previews(item, dontShowPreviews)}
+ ${this.articleBody(item)}
+ ${this.metaTable(item)}
+
+
+ `;
+ return itemHtml;
+
+ }
+
+ displayPlaces() {
+ const config = this.config;
+ // Places is an GeoJSON object
+ if (config && this.places && this.places.type === "FeatureCollection") {
+
+ var jsonString = JSON.stringify(places,null,2)
+
+ const dir = config.geoURL;
+ return `
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Download GeoJSON
+
+
+ `
+ } else {
+ return ``;
+ }
+ }
+
+ header(item) {
+ // Display the name of the thing with apropriate download links etc
+ var name = item.name ? item.name : item["@id"];
+ var types = this.crate.utils.asArray(item["@type"]);
+ var view;
+ var path = item["@id"];
+ var idLink = "";
+ // Special treatment for Datasets - add download links if there is a distribution
+ if (path.match(/^https?:\/\//i)) {
+ view = "Go to: ";
+ } else if (types.includes("Dataset")){
+ if (window.location.href.match(/^file:\/\//i)){
+ view = "Browse files ";
+ }
+ if (item["distribution"]) {
+ for (let dist of this.crate.utils.asArray(item["distribution"])){
+ const download = this.crate.getItem(dist["@id"]);
+ // Dealing with legacy - we used to have path mapped to contentUrl
+ if (download) {
+ var downloadName = download.name ? download.name : name;
+ var u = download["contentUrl"] ? download["contentUrl"] : download["path"];
+ if (u) {
+ idLink += `⬇️📦 Download this dataset: ${downloadName}`; + + } + } + } + } + } else if ( types.includes("File") || types.includes("ImageObject") || types.includes("MediaObject") || path === "ro-crate-metadata.jsonld"){ + view = "⬇️ Download: "; + } + if (view){ + idLink += `${view}`; + } + return `
${idLink} ${name}
` + } + + image(item) { + var image = ""; + if (item.image || item.thumbnail) { + var src; + if (item.image && item.image.length > 0 ) { + src = this.crate.utils.asArray(item.image)[0]; + delete item.image; + } else if (item.thumbnail && item.thumbnail.length > 0){ + src = this.crate.utils.asArray(item.thumbnail)[0]; + delete item.thumbnail; + } + if (src) { + if (src["@id"]) { + src = src["@id"]; + } + image = `${p.description}
${b}${this.crate.utils.asArray(item.name).join(" ")}
`; + delete item.name; + } + var rows = ""; + for (let prop of this.sortKeys(Object.keys(item))) { + if (prop === "@reverse") { + // Do nothing + } else { + rows += this.metadataRow(item, prop); + } + } + if (item["@reverse"]) { + rows += `
+ ${name}
+
+ ${rows}
+
+
`;
+ }
+
+ sortKeys(keys) {
+ // Sort a set or array of keys to be in a nice order
+ // Returns set
+ var keys_in_order = new Set();
+ keys = new Set(keys);
+ for (let key of display_keys) {
+ if (keys.has(key)) {
+ keys_in_order.add(key);
+ }
+ }
+ for (let key of keys) {
+ if (!keys_in_order.has(key)) {
+ keys_in_order.add(key);
+ }
+ }
+ return keys_in_order;
+ }
+
+
+ metadataRow(item, prop){
+ if (this.crate.context) {
+ const def = this.crate.getDefinition(prop);
+ var propName = prop;
+ if (def["rdfs:comment"]) {
+ propName = def["rdfs:label"] || propName;
+ propName = `${propName} [?]`
+
+ } else if (def["@id"]) {
+ propName = `${propName} [?]`;
+ }
+ }
+ return `
+
+ `;
+ }
+ }
+ } else {
+ if (page.values.length > 1 ) {
+ html += "+ ${this.displayValue(p.first)} -to- ${this.displayValue(p.last)} +
+ ${this.displayPage(p)} +- ";
+ for (let p of page.values) {
+ html += `
+
- ${this.displayValue(p)} + `; + } + html += "
' + func(text) + '
'; + * }); + * + * p('fred, barney, & pebbles'); + * // => 'fred, barney, & pebbles
' + */ + function wrap(value, wrapper) { + return partial(castFunction(wrapper), value); + } + + /*------------------------------------------------------------------------*/ + + /** + * Casts `value` as an array if it's not one. + * + * @static + * @memberOf _ + * @since 4.4.0 + * @category Lang + * @param {*} value The value to inspect. + * @returns {Array} Returns the cast array. + * @example + * + * _.castArray(1); + * // => [1] + * + * _.castArray({ 'a': 1 }); + * // => [{ 'a': 1 }] + * + * _.castArray('abc'); + * // => ['abc'] + * + * _.castArray(null); + * // => [null] + * + * _.castArray(undefined); + * // => [undefined] + * + * _.castArray(); + * // => [] + * + * var array = [1, 2, 3]; + * console.log(_.castArray(array) === array); + * // => true + */ + function castArray() { + if (!arguments.length) { + return []; + } + var value = arguments[0]; + return isArray(value) ? value : [value]; + } + + /** + * Creates a shallow clone of `value`. + * + * **Note:** This method is loosely based on the + * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm) + * and supports cloning arrays, array buffers, booleans, date objects, maps, + * numbers, `Object` objects, regexes, sets, strings, symbols, and typed + * arrays. The own enumerable properties of `arguments` objects are cloned + * as plain objects. An empty object is returned for uncloneable values such + * as error objects, functions, DOM nodes, and WeakMaps. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to clone. + * @returns {*} Returns the cloned value. + * @see _.cloneDeep + * @example + * + * var objects = [{ 'a': 1 }, { 'b': 2 }]; + * + * var shallow = _.clone(objects); + * console.log(shallow[0] === objects[0]); + * // => true + */ + function clone(value) { + return baseClone(value, CLONE_SYMBOLS_FLAG); + } + + /** + * This method is like `_.clone` except that it accepts `customizer` which + * is invoked to produce the cloned value. If `customizer` returns `undefined`, + * cloning is handled by the method instead. The `customizer` is invoked with + * up to four arguments; (value [, index|key, object, stack]). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to clone. + * @param {Function} [customizer] The function to customize cloning. + * @returns {*} Returns the cloned value. + * @see _.cloneDeepWith + * @example + * + * function customizer(value) { + * if (_.isElement(value)) { + * return value.cloneNode(false); + * } + * } + * + * var el = _.cloneWith(document.body, customizer); + * + * console.log(el === document.body); + * // => false + * console.log(el.nodeName); + * // => 'BODY' + * console.log(el.childNodes.length); + * // => 0 + */ + function cloneWith(value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseClone(value, CLONE_SYMBOLS_FLAG, customizer); + } + + /** + * This method is like `_.clone` except that it recursively clones `value`. + * + * @static + * @memberOf _ + * @since 1.0.0 + * @category Lang + * @param {*} value The value to recursively clone. + * @returns {*} Returns the deep cloned value. + * @see _.clone + * @example + * + * var objects = [{ 'a': 1 }, { 'b': 2 }]; + * + * var deep = _.cloneDeep(objects); + * console.log(deep[0] === objects[0]); + * // => false + */ + function cloneDeep(value) { + return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG); + } + + /** + * This method is like `_.cloneWith` except that it recursively clones `value`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to recursively clone. + * @param {Function} [customizer] The function to customize cloning. + * @returns {*} Returns the deep cloned value. + * @see _.cloneWith + * @example + * + * function customizer(value) { + * if (_.isElement(value)) { + * return value.cloneNode(true); + * } + * } + * + * var el = _.cloneDeepWith(document.body, customizer); + * + * console.log(el === document.body); + * // => false + * console.log(el.nodeName); + * // => 'BODY' + * console.log(el.childNodes.length); + * // => 20 + */ + function cloneDeepWith(value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer); + } + + /** + * Checks if `object` conforms to `source` by invoking the predicate + * properties of `source` with the corresponding property values of `object`. + * + * **Note:** This method is equivalent to `_.conforms` when `source` is + * partially applied. + * + * @static + * @memberOf _ + * @since 4.14.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property predicates to conform to. + * @returns {boolean} Returns `true` if `object` conforms, else `false`. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * + * _.conformsTo(object, { 'b': function(n) { return n > 1; } }); + * // => true + * + * _.conformsTo(object, { 'b': function(n) { return n > 2; } }); + * // => false + */ + function conformsTo(object, source) { + return source == null || baseConformsTo(object, source, keys(source)); + } + + /** + * Performs a + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * comparison between two values to determine if they are equivalent. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.eq(object, object); + * // => true + * + * _.eq(object, other); + * // => false + * + * _.eq('a', 'a'); + * // => true + * + * _.eq('a', Object('a')); + * // => false + * + * _.eq(NaN, NaN); + * // => true + */ + function eq(value, other) { + return value === other || (value !== value && other !== other); + } + + /** + * Checks if `value` is greater than `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than `other`, + * else `false`. + * @see _.lt + * @example + * + * _.gt(3, 1); + * // => true + * + * _.gt(3, 3); + * // => false + * + * _.gt(1, 3); + * // => false + */ + var gt = createRelationalOperation(baseGt); + + /** + * Checks if `value` is greater than or equal to `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than or equal to + * `other`, else `false`. + * @see _.lte + * @example + * + * _.gte(3, 1); + * // => true + * + * _.gte(3, 3); + * // => true + * + * _.gte(1, 3); + * // => false + */ + var gte = createRelationalOperation(function(value, other) { + return value >= other; + }); + + /** + * Checks if `value` is likely an `arguments` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an `arguments` object, + * else `false`. + * @example + * + * _.isArguments(function() { return arguments; }()); + * // => true + * + * _.isArguments([1, 2, 3]); + * // => false + */ + var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) { + return isObjectLike(value) && hasOwnProperty.call(value, 'callee') && + !propertyIsEnumerable.call(value, 'callee'); + }; + + /** + * Checks if `value` is classified as an `Array` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array, else `false`. + * @example + * + * _.isArray([1, 2, 3]); + * // => true + * + * _.isArray(document.body.children); + * // => false + * + * _.isArray('abc'); + * // => false + * + * _.isArray(_.noop); + * // => false + */ + var isArray = Array.isArray; + + /** + * Checks if `value` is classified as an `ArrayBuffer` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`. + * @example + * + * _.isArrayBuffer(new ArrayBuffer(2)); + * // => true + * + * _.isArrayBuffer(new Array(2)); + * // => false + */ + var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer; + + /** + * Checks if `value` is array-like. A value is considered array-like if it's + * not a function and has a `value.length` that's an integer greater than or + * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is array-like, else `false`. + * @example + * + * _.isArrayLike([1, 2, 3]); + * // => true + * + * _.isArrayLike(document.body.children); + * // => true + * + * _.isArrayLike('abc'); + * // => true + * + * _.isArrayLike(_.noop); + * // => false + */ + function isArrayLike(value) { + return value != null && isLength(value.length) && !isFunction(value); + } + + /** + * This method is like `_.isArrayLike` except that it also checks if `value` + * is an object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array-like object, + * else `false`. + * @example + * + * _.isArrayLikeObject([1, 2, 3]); + * // => true + * + * _.isArrayLikeObject(document.body.children); + * // => true + * + * _.isArrayLikeObject('abc'); + * // => false + * + * _.isArrayLikeObject(_.noop); + * // => false + */ + function isArrayLikeObject(value) { + return isObjectLike(value) && isArrayLike(value); + } + + /** + * Checks if `value` is classified as a boolean primitive or object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a boolean, else `false`. + * @example + * + * _.isBoolean(false); + * // => true + * + * _.isBoolean(null); + * // => false + */ + function isBoolean(value) { + return value === true || value === false || + (isObjectLike(value) && baseGetTag(value) == boolTag); + } + + /** + * Checks if `value` is a buffer. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a buffer, else `false`. + * @example + * + * _.isBuffer(new Buffer(2)); + * // => true + * + * _.isBuffer(new Uint8Array(2)); + * // => false + */ + var isBuffer = nativeIsBuffer || stubFalse; + + /** + * Checks if `value` is classified as a `Date` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a date object, else `false`. + * @example + * + * _.isDate(new Date); + * // => true + * + * _.isDate('Mon April 23 2012'); + * // => false + */ + var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate; + + /** + * Checks if `value` is likely a DOM element. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`. + * @example + * + * _.isElement(document.body); + * // => true + * + * _.isElement(''); + * // => false + */ + function isElement(value) { + return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value); + } + + /** + * Checks if `value` is an empty object, collection, map, or set. + * + * Objects are considered empty if they have no own enumerable string keyed + * properties. + * + * Array-like values such as `arguments` objects, arrays, buffers, strings, or + * jQuery-like collections are considered empty if they have a `length` of `0`. + * Similarly, maps and sets are considered empty if they have a `size` of `0`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is empty, else `false`. + * @example + * + * _.isEmpty(null); + * // => true + * + * _.isEmpty(true); + * // => true + * + * _.isEmpty(1); + * // => true + * + * _.isEmpty([1, 2, 3]); + * // => false + * + * _.isEmpty({ 'a': 1 }); + * // => false + */ + function isEmpty(value) { + if (value == null) { + return true; + } + if (isArrayLike(value) && + (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' || + isBuffer(value) || isTypedArray(value) || isArguments(value))) { + return !value.length; + } + var tag = getTag(value); + if (tag == mapTag || tag == setTag) { + return !value.size; + } + if (isPrototype(value)) { + return !baseKeys(value).length; + } + for (var key in value) { + if (hasOwnProperty.call(value, key)) { + return false; + } + } + return true; + } + + /** + * Performs a deep comparison between two values to determine if they are + * equivalent. + * + * **Note:** This method supports comparing arrays, array buffers, booleans, + * date objects, error objects, maps, numbers, `Object` objects, regexes, + * sets, strings, symbols, and typed arrays. `Object` objects are compared + * by their own, not inherited, enumerable properties. Functions and DOM + * nodes are compared by strict equality, i.e. `===`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.isEqual(object, other); + * // => true + * + * object === other; + * // => false + */ + function isEqual(value, other) { + return baseIsEqual(value, other); + } + + /** + * This method is like `_.isEqual` except that it accepts `customizer` which + * is invoked to compare values. If `customizer` returns `undefined`, comparisons + * are handled by the method instead. The `customizer` is invoked with up to + * six arguments: (objValue, othValue [, index|key, object, other, stack]). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * function isGreeting(value) { + * return /^h(?:i|ello)$/.test(value); + * } + * + * function customizer(objValue, othValue) { + * if (isGreeting(objValue) && isGreeting(othValue)) { + * return true; + * } + * } + * + * var array = ['hello', 'goodbye']; + * var other = ['hi', 'goodbye']; + * + * _.isEqualWith(array, other, customizer); + * // => true + */ + function isEqualWith(value, other, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + var result = customizer ? customizer(value, other) : undefined; + return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result; + } + + /** + * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`, + * `SyntaxError`, `TypeError`, or `URIError` object. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an error object, else `false`. + * @example + * + * _.isError(new Error); + * // => true + * + * _.isError(Error); + * // => false + */ + function isError(value) { + if (!isObjectLike(value)) { + return false; + } + var tag = baseGetTag(value); + return tag == errorTag || tag == domExcTag || + (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value)); + } + + /** + * Checks if `value` is a finite primitive number. + * + * **Note:** This method is based on + * [`Number.isFinite`](https://mdn.io/Number/isFinite). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a finite number, else `false`. + * @example + * + * _.isFinite(3); + * // => true + * + * _.isFinite(Number.MIN_VALUE); + * // => true + * + * _.isFinite(Infinity); + * // => false + * + * _.isFinite('3'); + * // => false + */ + function isFinite(value) { + return typeof value == 'number' && nativeIsFinite(value); + } + + /** + * Checks if `value` is classified as a `Function` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a function, else `false`. + * @example + * + * _.isFunction(_); + * // => true + * + * _.isFunction(/abc/); + * // => false + */ + function isFunction(value) { + if (!isObject(value)) { + return false; + } + // The use of `Object#toString` avoids issues with the `typeof` operator + // in Safari 9 which returns 'object' for typed arrays and other constructors. + var tag = baseGetTag(value); + return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag; + } + + /** + * Checks if `value` is an integer. + * + * **Note:** This method is based on + * [`Number.isInteger`](https://mdn.io/Number/isInteger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an integer, else `false`. + * @example + * + * _.isInteger(3); + * // => true + * + * _.isInteger(Number.MIN_VALUE); + * // => false + * + * _.isInteger(Infinity); + * // => false + * + * _.isInteger('3'); + * // => false + */ + function isInteger(value) { + return typeof value == 'number' && value == toInteger(value); + } + + /** + * Checks if `value` is a valid array-like length. + * + * **Note:** This method is loosely based on + * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. + * @example + * + * _.isLength(3); + * // => true + * + * _.isLength(Number.MIN_VALUE); + * // => false + * + * _.isLength(Infinity); + * // => false + * + * _.isLength('3'); + * // => false + */ + function isLength(value) { + return typeof value == 'number' && + value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; + } + + /** + * Checks if `value` is the + * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types) + * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an object, else `false`. + * @example + * + * _.isObject({}); + * // => true + * + * _.isObject([1, 2, 3]); + * // => true + * + * _.isObject(_.noop); + * // => true + * + * _.isObject(null); + * // => false + */ + function isObject(value) { + var type = typeof value; + return value != null && (type == 'object' || type == 'function'); + } + + /** + * Checks if `value` is object-like. A value is object-like if it's not `null` + * and has a `typeof` result of "object". + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is object-like, else `false`. + * @example + * + * _.isObjectLike({}); + * // => true + * + * _.isObjectLike([1, 2, 3]); + * // => true + * + * _.isObjectLike(_.noop); + * // => false + * + * _.isObjectLike(null); + * // => false + */ + function isObjectLike(value) { + return value != null && typeof value == 'object'; + } + + /** + * Checks if `value` is classified as a `Map` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a map, else `false`. + * @example + * + * _.isMap(new Map); + * // => true + * + * _.isMap(new WeakMap); + * // => false + */ + var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap; + + /** + * Performs a partial deep comparison between `object` and `source` to + * determine if `object` contains equivalent property values. + * + * **Note:** This method is equivalent to `_.matches` when `source` is + * partially applied. + * + * Partial comparisons will match empty array and empty object `source` + * values against any array or object value, respectively. See `_.isEqual` + * for a list of supported value comparisons. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * + * _.isMatch(object, { 'b': 2 }); + * // => true + * + * _.isMatch(object, { 'b': 1 }); + * // => false + */ + function isMatch(object, source) { + return object === source || baseIsMatch(object, source, getMatchData(source)); + } + + /** + * This method is like `_.isMatch` except that it accepts `customizer` which + * is invoked to compare values. If `customizer` returns `undefined`, comparisons + * are handled by the method instead. The `customizer` is invoked with five + * arguments: (objValue, srcValue, index|key, object, source). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @example + * + * function isGreeting(value) { + * return /^h(?:i|ello)$/.test(value); + * } + * + * function customizer(objValue, srcValue) { + * if (isGreeting(objValue) && isGreeting(srcValue)) { + * return true; + * } + * } + * + * var object = { 'greeting': 'hello' }; + * var source = { 'greeting': 'hi' }; + * + * _.isMatchWith(object, source, customizer); + * // => true + */ + function isMatchWith(object, source, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return baseIsMatch(object, source, getMatchData(source), customizer); + } + + /** + * Checks if `value` is `NaN`. + * + * **Note:** This method is based on + * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as + * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for + * `undefined` and other non-number values. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + * @example + * + * _.isNaN(NaN); + * // => true + * + * _.isNaN(new Number(NaN)); + * // => true + * + * isNaN(undefined); + * // => true + * + * _.isNaN(undefined); + * // => false + */ + function isNaN(value) { + // An `NaN` primitive is the only value that is not equal to itself. + // Perform the `toStringTag` check first to avoid errors with some + // ActiveX objects in IE. + return isNumber(value) && value != +value; + } + + /** + * Checks if `value` is a pristine native function. + * + * **Note:** This method can't reliably detect native functions in the presence + * of the core-js package because core-js circumvents this kind of detection. + * Despite multiple requests, the core-js maintainer has made it clear: any + * attempt to fix the detection will be obstructed. As a result, we're left + * with little choice but to throw an error. Unfortunately, this also affects + * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill), + * which rely on core-js. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a native function, + * else `false`. + * @example + * + * _.isNative(Array.prototype.push); + * // => true + * + * _.isNative(_); + * // => false + */ + function isNative(value) { + if (isMaskable(value)) { + throw new Error(CORE_ERROR_TEXT); + } + return baseIsNative(value); + } + + /** + * Checks if `value` is `null`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `null`, else `false`. + * @example + * + * _.isNull(null); + * // => true + * + * _.isNull(void 0); + * // => false + */ + function isNull(value) { + return value === null; + } + + /** + * Checks if `value` is `null` or `undefined`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is nullish, else `false`. + * @example + * + * _.isNil(null); + * // => true + * + * _.isNil(void 0); + * // => true + * + * _.isNil(NaN); + * // => false + */ + function isNil(value) { + return value == null; + } + + /** + * Checks if `value` is classified as a `Number` primitive or object. + * + * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are + * classified as numbers, use the `_.isFinite` method. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a number, else `false`. + * @example + * + * _.isNumber(3); + * // => true + * + * _.isNumber(Number.MIN_VALUE); + * // => true + * + * _.isNumber(Infinity); + * // => true + * + * _.isNumber('3'); + * // => false + */ + function isNumber(value) { + return typeof value == 'number' || + (isObjectLike(value) && baseGetTag(value) == numberTag); + } + + /** + * Checks if `value` is a plain object, that is, an object created by the + * `Object` constructor or one with a `[[Prototype]]` of `null`. + * + * @static + * @memberOf _ + * @since 0.8.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * _.isPlainObject(new Foo); + * // => false + * + * _.isPlainObject([1, 2, 3]); + * // => false + * + * _.isPlainObject({ 'x': 0, 'y': 0 }); + * // => true + * + * _.isPlainObject(Object.create(null)); + * // => true + */ + function isPlainObject(value) { + if (!isObjectLike(value) || baseGetTag(value) != objectTag) { + return false; + } + var proto = getPrototype(value); + if (proto === null) { + return true; + } + var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor; + return typeof Ctor == 'function' && Ctor instanceof Ctor && + funcToString.call(Ctor) == objectCtorString; + } + + /** + * Checks if `value` is classified as a `RegExp` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a regexp, else `false`. + * @example + * + * _.isRegExp(/abc/); + * // => true + * + * _.isRegExp('/abc/'); + * // => false + */ + var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp; + + /** + * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754 + * double precision number which isn't the result of a rounded unsafe integer. + * + * **Note:** This method is based on + * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`. + * @example + * + * _.isSafeInteger(3); + * // => true + * + * _.isSafeInteger(Number.MIN_VALUE); + * // => false + * + * _.isSafeInteger(Infinity); + * // => false + * + * _.isSafeInteger('3'); + * // => false + */ + function isSafeInteger(value) { + return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER; + } + + /** + * Checks if `value` is classified as a `Set` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a set, else `false`. + * @example + * + * _.isSet(new Set); + * // => true + * + * _.isSet(new WeakSet); + * // => false + */ + var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet; + + /** + * Checks if `value` is classified as a `String` primitive or object. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a string, else `false`. + * @example + * + * _.isString('abc'); + * // => true + * + * _.isString(1); + * // => false + */ + function isString(value) { + return typeof value == 'string' || + (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag); + } + + /** + * Checks if `value` is classified as a `Symbol` primitive or object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a symbol, else `false`. + * @example + * + * _.isSymbol(Symbol.iterator); + * // => true + * + * _.isSymbol('abc'); + * // => false + */ + function isSymbol(value) { + return typeof value == 'symbol' || + (isObjectLike(value) && baseGetTag(value) == symbolTag); + } + + /** + * Checks if `value` is classified as a typed array. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a typed array, else `false`. + * @example + * + * _.isTypedArray(new Uint8Array); + * // => true + * + * _.isTypedArray([]); + * // => false + */ + var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray; + + /** + * Checks if `value` is `undefined`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`. + * @example + * + * _.isUndefined(void 0); + * // => true + * + * _.isUndefined(null); + * // => false + */ + function isUndefined(value) { + return value === undefined; + } + + /** + * Checks if `value` is classified as a `WeakMap` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a weak map, else `false`. + * @example + * + * _.isWeakMap(new WeakMap); + * // => true + * + * _.isWeakMap(new Map); + * // => false + */ + function isWeakMap(value) { + return isObjectLike(value) && getTag(value) == weakMapTag; + } + + /** + * Checks if `value` is classified as a `WeakSet` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a weak set, else `false`. + * @example + * + * _.isWeakSet(new WeakSet); + * // => true + * + * _.isWeakSet(new Set); + * // => false + */ + function isWeakSet(value) { + return isObjectLike(value) && baseGetTag(value) == weakSetTag; + } + + /** + * Checks if `value` is less than `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than `other`, + * else `false`. + * @see _.gt + * @example + * + * _.lt(1, 3); + * // => true + * + * _.lt(3, 3); + * // => false + * + * _.lt(3, 1); + * // => false + */ + var lt = createRelationalOperation(baseLt); + + /** + * Checks if `value` is less than or equal to `other`. + * + * @static + * @memberOf _ + * @since 3.9.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than or equal to + * `other`, else `false`. + * @see _.gte + * @example + * + * _.lte(1, 3); + * // => true + * + * _.lte(3, 3); + * // => true + * + * _.lte(3, 1); + * // => false + */ + var lte = createRelationalOperation(function(value, other) { + return value <= other; + }); + + /** + * Converts `value` to an array. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to convert. + * @returns {Array} Returns the converted array. + * @example + * + * _.toArray({ 'a': 1, 'b': 2 }); + * // => [1, 2] + * + * _.toArray('abc'); + * // => ['a', 'b', 'c'] + * + * _.toArray(1); + * // => [] + * + * _.toArray(null); + * // => [] + */ + function toArray(value) { + if (!value) { + return []; + } + if (isArrayLike(value)) { + return isString(value) ? stringToArray(value) : copyArray(value); + } + if (symIterator && value[symIterator]) { + return iteratorToArray(value[symIterator]()); + } + var tag = getTag(value), + func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values); + + return func(value); + } + + /** + * Converts `value` to a finite number. + * + * @static + * @memberOf _ + * @since 4.12.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted number. + * @example + * + * _.toFinite(3.2); + * // => 3.2 + * + * _.toFinite(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toFinite(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toFinite('3.2'); + * // => 3.2 + */ + function toFinite(value) { + if (!value) { + return value === 0 ? value : 0; + } + value = toNumber(value); + if (value === INFINITY || value === -INFINITY) { + var sign = (value < 0 ? -1 : 1); + return sign * MAX_INTEGER; + } + return value === value ? value : 0; + } + + /** + * Converts `value` to an integer. + * + * **Note:** This method is loosely based on + * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toInteger(3.2); + * // => 3 + * + * _.toInteger(Number.MIN_VALUE); + * // => 0 + * + * _.toInteger(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toInteger('3.2'); + * // => 3 + */ + function toInteger(value) { + var result = toFinite(value), + remainder = result % 1; + + return result === result ? (remainder ? result - remainder : result) : 0; + } + + /** + * Converts `value` to an integer suitable for use as the length of an + * array-like object. + * + * **Note:** This method is based on + * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toLength(3.2); + * // => 3 + * + * _.toLength(Number.MIN_VALUE); + * // => 0 + * + * _.toLength(Infinity); + * // => 4294967295 + * + * _.toLength('3.2'); + * // => 3 + */ + function toLength(value) { + return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0; + } + + /** + * Converts `value` to a number. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to process. + * @returns {number} Returns the number. + * @example + * + * _.toNumber(3.2); + * // => 3.2 + * + * _.toNumber(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toNumber(Infinity); + * // => Infinity + * + * _.toNumber('3.2'); + * // => 3.2 + */ + function toNumber(value) { + if (typeof value == 'number') { + return value; + } + if (isSymbol(value)) { + return NAN; + } + if (isObject(value)) { + var other = typeof value.valueOf == 'function' ? value.valueOf() : value; + value = isObject(other) ? (other + '') : other; + } + if (typeof value != 'string') { + return value === 0 ? value : +value; + } + value = value.replace(reTrim, ''); + var isBinary = reIsBinary.test(value); + return (isBinary || reIsOctal.test(value)) + ? freeParseInt(value.slice(2), isBinary ? 2 : 8) + : (reIsBadHex.test(value) ? NAN : +value); + } + + /** + * Converts `value` to a plain object flattening inherited enumerable string + * keyed properties of `value` to own properties of the plain object. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {Object} Returns the converted plain object. + * @example + * + * function Foo() { + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.assign({ 'a': 1 }, new Foo); + * // => { 'a': 1, 'b': 2 } + * + * _.assign({ 'a': 1 }, _.toPlainObject(new Foo)); + * // => { 'a': 1, 'b': 2, 'c': 3 } + */ + function toPlainObject(value) { + return copyObject(value, keysIn(value)); + } + + /** + * Converts `value` to a safe integer. A safe integer can be compared and + * represented correctly. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toSafeInteger(3.2); + * // => 3 + * + * _.toSafeInteger(Number.MIN_VALUE); + * // => 0 + * + * _.toSafeInteger(Infinity); + * // => 9007199254740991 + * + * _.toSafeInteger('3.2'); + * // => 3 + */ + function toSafeInteger(value) { + return value + ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER) + : (value === 0 ? value : 0); + } + + /** + * Converts `value` to a string. An empty string is returned for `null` + * and `undefined` values. The sign of `-0` is preserved. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {string} Returns the converted string. + * @example + * + * _.toString(null); + * // => '' + * + * _.toString(-0); + * // => '-0' + * + * _.toString([1, 2, 3]); + * // => '1,2,3' + */ + function toString(value) { + return value == null ? '' : baseToString(value); + } + + /*------------------------------------------------------------------------*/ + + /** + * Assigns own enumerable string keyed properties of source objects to the + * destination object. Source objects are applied from left to right. + * Subsequent sources overwrite property assignments of previous sources. + * + * **Note:** This method mutates `object` and is loosely based on + * [`Object.assign`](https://mdn.io/Object/assign). + * + * @static + * @memberOf _ + * @since 0.10.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.assignIn + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * function Bar() { + * this.c = 3; + * } + * + * Foo.prototype.b = 2; + * Bar.prototype.d = 4; + * + * _.assign({ 'a': 0 }, new Foo, new Bar); + * // => { 'a': 1, 'c': 3 } + */ + var assign = createAssigner(function(object, source) { + if (isPrototype(source) || isArrayLike(source)) { + copyObject(source, keys(source), object); + return; + } + for (var key in source) { + if (hasOwnProperty.call(source, key)) { + assignValue(object, key, source[key]); + } + } + }); + + /** + * This method is like `_.assign` except that it iterates over own and + * inherited source properties. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias extend + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.assign + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * function Bar() { + * this.c = 3; + * } + * + * Foo.prototype.b = 2; + * Bar.prototype.d = 4; + * + * _.assignIn({ 'a': 0 }, new Foo, new Bar); + * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 } + */ + var assignIn = createAssigner(function(object, source) { + copyObject(source, keysIn(source), object); + }); + + /** + * This method is like `_.assignIn` except that it accepts `customizer` + * which is invoked to produce the assigned values. If `customizer` returns + * `undefined`, assignment is handled by the method instead. The `customizer` + * is invoked with five arguments: (objValue, srcValue, key, object, source). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias extendWith + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @see _.assignWith + * @example + * + * function customizer(objValue, srcValue) { + * return _.isUndefined(objValue) ? srcValue : objValue; + * } + * + * var defaults = _.partialRight(_.assignInWith, customizer); + * + * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var assignInWith = createAssigner(function(object, source, srcIndex, customizer) { + copyObject(source, keysIn(source), object, customizer); + }); + + /** + * This method is like `_.assign` except that it accepts `customizer` + * which is invoked to produce the assigned values. If `customizer` returns + * `undefined`, assignment is handled by the method instead. The `customizer` + * is invoked with five arguments: (objValue, srcValue, key, object, source). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @see _.assignInWith + * @example + * + * function customizer(objValue, srcValue) { + * return _.isUndefined(objValue) ? srcValue : objValue; + * } + * + * var defaults = _.partialRight(_.assignWith, customizer); + * + * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var assignWith = createAssigner(function(object, source, srcIndex, customizer) { + copyObject(source, keys(source), object, customizer); + }); + + /** + * Creates an array of values corresponding to `paths` of `object`. + * + * @static + * @memberOf _ + * @since 1.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Array} Returns the picked values. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; + * + * _.at(object, ['a[0].b.c', 'a[1]']); + * // => [3, 4] + */ + var at = flatRest(baseAt); + + /** + * Creates an object that inherits from the `prototype` object. If a + * `properties` object is given, its own enumerable string keyed properties + * are assigned to the created object. + * + * @static + * @memberOf _ + * @since 2.3.0 + * @category Object + * @param {Object} prototype The object to inherit from. + * @param {Object} [properties] The properties to assign to the object. + * @returns {Object} Returns the new object. + * @example + * + * function Shape() { + * this.x = 0; + * this.y = 0; + * } + * + * function Circle() { + * Shape.call(this); + * } + * + * Circle.prototype = _.create(Shape.prototype, { + * 'constructor': Circle + * }); + * + * var circle = new Circle; + * circle instanceof Circle; + * // => true + * + * circle instanceof Shape; + * // => true + */ + function create(prototype, properties) { + var result = baseCreate(prototype); + return properties == null ? result : baseAssign(result, properties); + } + + /** + * Assigns own and inherited enumerable string keyed properties of source + * objects to the destination object for all destination properties that + * resolve to `undefined`. Source objects are applied from left to right. + * Once a property is set, additional values of the same property are ignored. + * + * **Note:** This method mutates `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.defaultsDeep + * @example + * + * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); + * // => { 'a': 1, 'b': 2 } + */ + var defaults = baseRest(function(object, sources) { + object = Object(object); + + var index = -1; + var length = sources.length; + var guard = length > 2 ? sources[2] : undefined; + + if (guard && isIterateeCall(sources[0], sources[1], guard)) { + length = 1; + } + + while (++index < length) { + var source = sources[index]; + var props = keysIn(source); + var propsIndex = -1; + var propsLength = props.length; + + while (++propsIndex < propsLength) { + var key = props[propsIndex]; + var value = object[key]; + + if (value === undefined || + (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) { + object[key] = source[key]; + } + } + } + + return object; + }); + + /** + * This method is like `_.defaults` except that it recursively assigns + * default properties. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 3.10.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.defaults + * @example + * + * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } }); + * // => { 'a': { 'b': 2, 'c': 3 } } + */ + var defaultsDeep = baseRest(function(args) { + args.push(undefined, customDefaultsMerge); + return apply(mergeWith, undefined, args); + }); + + /** + * This method is like `_.find` except that it returns the key of the first + * element `predicate` returns truthy for instead of the element itself. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category Object + * @param {Object} object The object to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {string|undefined} Returns the key of the matched element, + * else `undefined`. + * @example + * + * var users = { + * 'barney': { 'age': 36, 'active': true }, + * 'fred': { 'age': 40, 'active': false }, + * 'pebbles': { 'age': 1, 'active': true } + * }; + * + * _.findKey(users, function(o) { return o.age < 40; }); + * // => 'barney' (iteration order is not guaranteed) + * + * // The `_.matches` iteratee shorthand. + * _.findKey(users, { 'age': 1, 'active': true }); + * // => 'pebbles' + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findKey(users, ['active', false]); + * // => 'fred' + * + * // The `_.property` iteratee shorthand. + * _.findKey(users, 'active'); + * // => 'barney' + */ + function findKey(object, predicate) { + return baseFindKey(object, getIteratee(predicate, 3), baseForOwn); + } + + /** + * This method is like `_.findKey` except that it iterates over elements of + * a collection in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to inspect. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {string|undefined} Returns the key of the matched element, + * else `undefined`. + * @example + * + * var users = { + * 'barney': { 'age': 36, 'active': true }, + * 'fred': { 'age': 40, 'active': false }, + * 'pebbles': { 'age': 1, 'active': true } + * }; + * + * _.findLastKey(users, function(o) { return o.age < 40; }); + * // => returns 'pebbles' assuming `_.findKey` returns 'barney' + * + * // The `_.matches` iteratee shorthand. + * _.findLastKey(users, { 'age': 36, 'active': true }); + * // => 'barney' + * + * // The `_.matchesProperty` iteratee shorthand. + * _.findLastKey(users, ['active', false]); + * // => 'fred' + * + * // The `_.property` iteratee shorthand. + * _.findLastKey(users, 'active'); + * // => 'pebbles' + */ + function findLastKey(object, predicate) { + return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight); + } + + /** + * Iterates over own and inherited enumerable string keyed properties of an + * object and invokes `iteratee` for each property. The iteratee is invoked + * with three arguments: (value, key, object). Iteratee functions may exit + * iteration early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 0.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forInRight + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forIn(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed). + */ + function forIn(object, iteratee) { + return object == null + ? object + : baseFor(object, getIteratee(iteratee, 3), keysIn); + } + + /** + * This method is like `_.forIn` except that it iterates over properties of + * `object` in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forIn + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forInRight(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'. + */ + function forInRight(object, iteratee) { + return object == null + ? object + : baseForRight(object, getIteratee(iteratee, 3), keysIn); + } + + /** + * Iterates over own enumerable string keyed properties of an object and + * invokes `iteratee` for each property. The iteratee is invoked with three + * arguments: (value, key, object). Iteratee functions may exit iteration + * early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 0.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forOwnRight + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forOwn(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a' then 'b' (iteration order is not guaranteed). + */ + function forOwn(object, iteratee) { + return object && baseForOwn(object, getIteratee(iteratee, 3)); + } + + /** + * This method is like `_.forOwn` except that it iterates over properties of + * `object` in the opposite order. + * + * @static + * @memberOf _ + * @since 2.0.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns `object`. + * @see _.forOwn + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.forOwnRight(new Foo, function(value, key) { + * console.log(key); + * }); + * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'. + */ + function forOwnRight(object, iteratee) { + return object && baseForOwnRight(object, getIteratee(iteratee, 3)); + } + + /** + * Creates an array of function property names from own enumerable properties + * of `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to inspect. + * @returns {Array} Returns the function names. + * @see _.functionsIn + * @example + * + * function Foo() { + * this.a = _.constant('a'); + * this.b = _.constant('b'); + * } + * + * Foo.prototype.c = _.constant('c'); + * + * _.functions(new Foo); + * // => ['a', 'b'] + */ + function functions(object) { + return object == null ? [] : baseFunctions(object, keys(object)); + } + + /** + * Creates an array of function property names from own and inherited + * enumerable properties of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to inspect. + * @returns {Array} Returns the function names. + * @see _.functions + * @example + * + * function Foo() { + * this.a = _.constant('a'); + * this.b = _.constant('b'); + * } + * + * Foo.prototype.c = _.constant('c'); + * + * _.functionsIn(new Foo); + * // => ['a', 'b', 'c'] + */ + function functionsIn(object) { + return object == null ? [] : baseFunctions(object, keysIn(object)); + } + + /** + * Gets the value at `path` of `object`. If the resolved value is + * `undefined`, the `defaultValue` is returned in its place. + * + * @static + * @memberOf _ + * @since 3.7.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to get. + * @param {*} [defaultValue] The value returned for `undefined` resolved values. + * @returns {*} Returns the resolved value. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.get(object, 'a[0].b.c'); + * // => 3 + * + * _.get(object, ['a', '0', 'b', 'c']); + * // => 3 + * + * _.get(object, 'a.b.c', 'default'); + * // => 'default' + */ + function get(object, path, defaultValue) { + var result = object == null ? undefined : baseGet(object, path); + return result === undefined ? defaultValue : result; + } + + /** + * Checks if `path` is a direct property of `object`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @example + * + * var object = { 'a': { 'b': 2 } }; + * var other = _.create({ 'a': _.create({ 'b': 2 }) }); + * + * _.has(object, 'a'); + * // => true + * + * _.has(object, 'a.b'); + * // => true + * + * _.has(object, ['a', 'b']); + * // => true + * + * _.has(other, 'a'); + * // => false + */ + function has(object, path) { + return object != null && hasPath(object, path, baseHas); + } + + /** + * Checks if `path` is a direct or inherited property of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @example + * + * var object = _.create({ 'a': _.create({ 'b': 2 }) }); + * + * _.hasIn(object, 'a'); + * // => true + * + * _.hasIn(object, 'a.b'); + * // => true + * + * _.hasIn(object, ['a', 'b']); + * // => true + * + * _.hasIn(object, 'b'); + * // => false + */ + function hasIn(object, path) { + return object != null && hasPath(object, path, baseHasIn); + } + + /** + * Creates an object composed of the inverted keys and values of `object`. + * If `object` contains duplicate values, subsequent values overwrite + * property assignments of previous values. + * + * @static + * @memberOf _ + * @since 0.7.0 + * @category Object + * @param {Object} object The object to invert. + * @returns {Object} Returns the new inverted object. + * @example + * + * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * + * _.invert(object); + * // => { '1': 'c', '2': 'b' } + */ + var invert = createInverter(function(result, value, key) { + if (value != null && + typeof value.toString != 'function') { + value = nativeObjectToString.call(value); + } + + result[value] = key; + }, constant(identity)); + + /** + * This method is like `_.invert` except that the inverted object is generated + * from the results of running each element of `object` thru `iteratee`. The + * corresponding inverted value of each inverted key is an array of keys + * responsible for generating the inverted value. The iteratee is invoked + * with one argument: (value). + * + * @static + * @memberOf _ + * @since 4.1.0 + * @category Object + * @param {Object} object The object to invert. + * @param {Function} [iteratee=_.identity] The iteratee invoked per element. + * @returns {Object} Returns the new inverted object. + * @example + * + * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * + * _.invertBy(object); + * // => { '1': ['a', 'c'], '2': ['b'] } + * + * _.invertBy(object, function(value) { + * return 'group' + value; + * }); + * // => { 'group1': ['a', 'c'], 'group2': ['b'] } + */ + var invertBy = createInverter(function(result, value, key) { + if (value != null && + typeof value.toString != 'function') { + value = nativeObjectToString.call(value); + } + + if (hasOwnProperty.call(result, value)) { + result[value].push(key); + } else { + result[value] = [key]; + } + }, getIteratee); + + /** + * Invokes the method at `path` of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the method to invoke. + * @param {...*} [args] The arguments to invoke the method with. + * @returns {*} Returns the result of the invoked method. + * @example + * + * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] }; + * + * _.invoke(object, 'a[0].b.c.slice', 1, 3); + * // => [2, 3] + */ + var invoke = baseRest(baseInvoke); + + /** + * Creates an array of the own enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. See the + * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys) + * for more details. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keys(new Foo); + * // => ['a', 'b'] (iteration order is not guaranteed) + * + * _.keys('hi'); + * // => ['0', '1'] + */ + function keys(object) { + return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object); + } + + /** + * Creates an array of the own and inherited enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keysIn(new Foo); + * // => ['a', 'b', 'c'] (iteration order is not guaranteed) + */ + function keysIn(object) { + return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object); + } + + /** + * The opposite of `_.mapValues`; this method creates an object with the + * same values as `object` and keys generated by running each own enumerable + * string keyed property of `object` thru `iteratee`. The iteratee is invoked + * with three arguments: (value, key, object). + * + * @static + * @memberOf _ + * @since 3.8.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns the new mapped object. + * @see _.mapValues + * @example + * + * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) { + * return key + value; + * }); + * // => { 'a1': 1, 'b2': 2 } + */ + function mapKeys(object, iteratee) { + var result = {}; + iteratee = getIteratee(iteratee, 3); + + baseForOwn(object, function(value, key, object) { + baseAssignValue(result, iteratee(value, key, object), value); + }); + return result; + } + + /** + * Creates an object with the same keys as `object` and values generated + * by running each own enumerable string keyed property of `object` thru + * `iteratee`. The iteratee is invoked with three arguments: + * (value, key, object). + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Object} Returns the new mapped object. + * @see _.mapKeys + * @example + * + * var users = { + * 'fred': { 'user': 'fred', 'age': 40 }, + * 'pebbles': { 'user': 'pebbles', 'age': 1 } + * }; + * + * _.mapValues(users, function(o) { return o.age; }); + * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + * + * // The `_.property` iteratee shorthand. + * _.mapValues(users, 'age'); + * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + */ + function mapValues(object, iteratee) { + var result = {}; + iteratee = getIteratee(iteratee, 3); + + baseForOwn(object, function(value, key, object) { + baseAssignValue(result, key, iteratee(value, key, object)); + }); + return result; + } + + /** + * This method is like `_.assign` except that it recursively merges own and + * inherited enumerable string keyed properties of source objects into the + * destination object. Source properties that resolve to `undefined` are + * skipped if a destination value exists. Array and plain object properties + * are merged recursively. Other objects and value types are overridden by + * assignment. Source objects are applied from left to right. Subsequent + * sources overwrite property assignments of previous sources. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 0.5.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @example + * + * var object = { + * 'a': [{ 'b': 2 }, { 'd': 4 }] + * }; + * + * var other = { + * 'a': [{ 'c': 3 }, { 'e': 5 }] + * }; + * + * _.merge(object, other); + * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] } + */ + var merge = createAssigner(function(object, source, srcIndex) { + baseMerge(object, source, srcIndex); + }); + + /** + * This method is like `_.merge` except that it accepts `customizer` which + * is invoked to produce the merged values of the destination and source + * properties. If `customizer` returns `undefined`, merging is handled by the + * method instead. The `customizer` is invoked with six arguments: + * (objValue, srcValue, key, object, source, stack). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} sources The source objects. + * @param {Function} customizer The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * function customizer(objValue, srcValue) { + * if (_.isArray(objValue)) { + * return objValue.concat(srcValue); + * } + * } + * + * var object = { 'a': [1], 'b': [2] }; + * var other = { 'a': [3], 'b': [4] }; + * + * _.mergeWith(object, other, customizer); + * // => { 'a': [1, 3], 'b': [2, 4] } + */ + var mergeWith = createAssigner(function(object, source, srcIndex, customizer) { + baseMerge(object, source, srcIndex, customizer); + }); + + /** + * The opposite of `_.pick`; this method creates an object composed of the + * own and inherited enumerable property paths of `object` that are not omitted. + * + * **Note:** This method is considerably slower than `_.pick`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to omit. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.omit(object, ['a', 'c']); + * // => { 'b': '2' } + */ + var omit = flatRest(function(object, paths) { + var result = {}; + if (object == null) { + return result; + } + var isDeep = false; + paths = arrayMap(paths, function(path) { + path = castPath(path, object); + isDeep || (isDeep = path.length > 1); + return path; + }); + copyObject(object, getAllKeysIn(object), result); + if (isDeep) { + result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone); + } + var length = paths.length; + while (length--) { + baseUnset(result, paths[length]); + } + return result; + }); + + /** + * The opposite of `_.pickBy`; this method creates an object composed of + * the own and inherited enumerable string keyed properties of `object` that + * `predicate` doesn't return truthy for. The predicate is invoked with two + * arguments: (value, key). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The source object. + * @param {Function} [predicate=_.identity] The function invoked per property. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.omitBy(object, _.isNumber); + * // => { 'b': '2' } + */ + function omitBy(object, predicate) { + return pickBy(object, negate(getIteratee(predicate))); + } + + /** + * Creates an object composed of the picked `object` properties. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.pick(object, ['a', 'c']); + * // => { 'a': 1, 'c': 3 } + */ + var pick = flatRest(function(object, paths) { + return object == null ? {} : basePick(object, paths); + }); + + /** + * Creates an object composed of the `object` properties `predicate` returns + * truthy for. The predicate is invoked with two arguments: (value, key). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The source object. + * @param {Function} [predicate=_.identity] The function invoked per property. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.pickBy(object, _.isNumber); + * // => { 'a': 1, 'c': 3 } + */ + function pickBy(object, predicate) { + if (object == null) { + return {}; + } + var props = arrayMap(getAllKeysIn(object), function(prop) { + return [prop]; + }); + predicate = getIteratee(predicate); + return basePickBy(object, props, function(value, path) { + return predicate(value, path[0]); + }); + } + + /** + * This method is like `_.get` except that if the resolved value is a + * function it's invoked with the `this` binding of its parent object and + * its result is returned. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to resolve. + * @param {*} [defaultValue] The value returned for `undefined` resolved values. + * @returns {*} Returns the resolved value. + * @example + * + * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] }; + * + * _.result(object, 'a[0].b.c1'); + * // => 3 + * + * _.result(object, 'a[0].b.c2'); + * // => 4 + * + * _.result(object, 'a[0].b.c3', 'default'); + * // => 'default' + * + * _.result(object, 'a[0].b.c3', _.constant('default')); + * // => 'default' + */ + function result(object, path, defaultValue) { + path = castPath(path, object); + + var index = -1, + length = path.length; + + // Ensure the loop is entered when path is empty. + if (!length) { + length = 1; + object = undefined; + } + while (++index < length) { + var value = object == null ? undefined : object[toKey(path[index])]; + if (value === undefined) { + index = length; + value = defaultValue; + } + object = isFunction(value) ? value.call(object) : value; + } + return object; + } + + /** + * Sets the value at `path` of `object`. If a portion of `path` doesn't exist, + * it's created. Arrays are created for missing index properties while objects + * are created for all other missing properties. Use `_.setWith` to customize + * `path` creation. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 3.7.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @returns {Object} Returns `object`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.set(object, 'a[0].b.c', 4); + * console.log(object.a[0].b.c); + * // => 4 + * + * _.set(object, ['x', '0', 'y', 'z'], 5); + * console.log(object.x[0].y.z); + * // => 5 + */ + function set(object, path, value) { + return object == null ? object : baseSet(object, path, value); + } + + /** + * This method is like `_.set` except that it accepts `customizer` which is + * invoked to produce the objects of `path`. If `customizer` returns `undefined` + * path creation is handled by the method instead. The `customizer` is invoked + * with three arguments: (nsValue, key, nsObject). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * var object = {}; + * + * _.setWith(object, '[0][1]', 'a', Object); + * // => { '0': { '1': 'a' } } + */ + function setWith(object, path, value, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return object == null ? object : baseSet(object, path, value, customizer); + } + + /** + * Creates an array of own enumerable string keyed-value pairs for `object` + * which can be consumed by `_.fromPairs`. If `object` is a map or set, its + * entries are returned. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias entries + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the key-value pairs. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.toPairs(new Foo); + * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed) + */ + var toPairs = createToPairs(keys); + + /** + * Creates an array of own and inherited enumerable string keyed-value pairs + * for `object` which can be consumed by `_.fromPairs`. If `object` is a map + * or set, its entries are returned. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias entriesIn + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the key-value pairs. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.toPairsIn(new Foo); + * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed) + */ + var toPairsIn = createToPairs(keysIn); + + /** + * An alternative to `_.reduce`; this method transforms `object` to a new + * `accumulator` object which is the result of running each of its own + * enumerable string keyed properties thru `iteratee`, with each invocation + * potentially mutating the `accumulator` object. If `accumulator` is not + * provided, a new object with the same `[[Prototype]]` will be used. The + * iteratee is invoked with four arguments: (accumulator, value, key, object). + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @since 1.3.0 + * @category Object + * @param {Object} object The object to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {*} [accumulator] The custom accumulator value. + * @returns {*} Returns the accumulated value. + * @example + * + * _.transform([2, 3, 4], function(result, n) { + * result.push(n *= n); + * return n % 2 == 0; + * }, []); + * // => [4, 9] + * + * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { + * (result[value] || (result[value] = [])).push(key); + * }, {}); + * // => { '1': ['a', 'c'], '2': ['b'] } + */ + function transform(object, iteratee, accumulator) { + var isArr = isArray(object), + isArrLike = isArr || isBuffer(object) || isTypedArray(object); + + iteratee = getIteratee(iteratee, 4); + if (accumulator == null) { + var Ctor = object && object.constructor; + if (isArrLike) { + accumulator = isArr ? new Ctor : []; + } + else if (isObject(object)) { + accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {}; + } + else { + accumulator = {}; + } + } + (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) { + return iteratee(accumulator, value, index, object); + }); + return accumulator; + } + + /** + * Removes the property at `path` of `object`. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to unset. + * @returns {boolean} Returns `true` if the property is deleted, else `false`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 7 } }] }; + * _.unset(object, 'a[0].b.c'); + * // => true + * + * console.log(object); + * // => { 'a': [{ 'b': {} }] }; + * + * _.unset(object, ['a', '0', 'b', 'c']); + * // => true + * + * console.log(object); + * // => { 'a': [{ 'b': {} }] }; + */ + function unset(object, path) { + return object == null ? true : baseUnset(object, path); + } + + /** + * This method is like `_.set` except that accepts `updater` to produce the + * value to set. Use `_.updateWith` to customize `path` creation. The `updater` + * is invoked with one argument: (value). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.6.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {Function} updater The function to produce the updated value. + * @returns {Object} Returns `object`. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.update(object, 'a[0].b.c', function(n) { return n * n; }); + * console.log(object.a[0].b.c); + * // => 9 + * + * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; }); + * console.log(object.x[0].y.z); + * // => 0 + */ + function update(object, path, updater) { + return object == null ? object : baseUpdate(object, path, castFunction(updater)); + } + + /** + * This method is like `_.update` except that it accepts `customizer` which is + * invoked to produce the objects of `path`. If `customizer` returns `undefined` + * path creation is handled by the method instead. The `customizer` is invoked + * with three arguments: (nsValue, key, nsObject). + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.6.0 + * @category Object + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {Function} updater The function to produce the updated value. + * @param {Function} [customizer] The function to customize assigned values. + * @returns {Object} Returns `object`. + * @example + * + * var object = {}; + * + * _.updateWith(object, '[0][1]', _.constant('a'), Object); + * // => { '0': { '1': 'a' } } + */ + function updateWith(object, path, updater, customizer) { + customizer = typeof customizer == 'function' ? customizer : undefined; + return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer); + } + + /** + * Creates an array of the own enumerable string keyed property values of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property values. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.values(new Foo); + * // => [1, 2] (iteration order is not guaranteed) + * + * _.values('hi'); + * // => ['h', 'i'] + */ + function values(object) { + return object == null ? [] : baseValues(object, keys(object)); + } + + /** + * Creates an array of the own and inherited enumerable string keyed property + * values of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property values. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.valuesIn(new Foo); + * // => [1, 2, 3] (iteration order is not guaranteed) + */ + function valuesIn(object) { + return object == null ? [] : baseValues(object, keysIn(object)); + } + + /*------------------------------------------------------------------------*/ + + /** + * Clamps `number` within the inclusive `lower` and `upper` bounds. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Number + * @param {number} number The number to clamp. + * @param {number} [lower] The lower bound. + * @param {number} upper The upper bound. + * @returns {number} Returns the clamped number. + * @example + * + * _.clamp(-10, -5, 5); + * // => -5 + * + * _.clamp(10, -5, 5); + * // => 5 + */ + function clamp(number, lower, upper) { + if (upper === undefined) { + upper = lower; + lower = undefined; + } + if (upper !== undefined) { + upper = toNumber(upper); + upper = upper === upper ? upper : 0; + } + if (lower !== undefined) { + lower = toNumber(lower); + lower = lower === lower ? lower : 0; + } + return baseClamp(toNumber(number), lower, upper); + } + + /** + * Checks if `n` is between `start` and up to, but not including, `end`. If + * `end` is not specified, it's set to `start` with `start` then set to `0`. + * If `start` is greater than `end` the params are swapped to support + * negative ranges. + * + * @static + * @memberOf _ + * @since 3.3.0 + * @category Number + * @param {number} number The number to check. + * @param {number} [start=0] The start of the range. + * @param {number} end The end of the range. + * @returns {boolean} Returns `true` if `number` is in the range, else `false`. + * @see _.range, _.rangeRight + * @example + * + * _.inRange(3, 2, 4); + * // => true + * + * _.inRange(4, 8); + * // => true + * + * _.inRange(4, 2); + * // => false + * + * _.inRange(2, 2); + * // => false + * + * _.inRange(1.2, 2); + * // => true + * + * _.inRange(5.2, 4); + * // => false + * + * _.inRange(-3, -2, -6); + * // => true + */ + function inRange(number, start, end) { + start = toFinite(start); + if (end === undefined) { + end = start; + start = 0; + } else { + end = toFinite(end); + } + number = toNumber(number); + return baseInRange(number, start, end); + } + + /** + * Produces a random number between the inclusive `lower` and `upper` bounds. + * If only one argument is provided a number between `0` and the given number + * is returned. If `floating` is `true`, or either `lower` or `upper` are + * floats, a floating-point number is returned instead of an integer. + * + * **Note:** JavaScript follows the IEEE-754 standard for resolving + * floating-point values which can produce unexpected results. + * + * @static + * @memberOf _ + * @since 0.7.0 + * @category Number + * @param {number} [lower=0] The lower bound. + * @param {number} [upper=1] The upper bound. + * @param {boolean} [floating] Specify returning a floating-point number. + * @returns {number} Returns the random number. + * @example + * + * _.random(0, 5); + * // => an integer between 0 and 5 + * + * _.random(5); + * // => also an integer between 0 and 5 + * + * _.random(5, true); + * // => a floating-point number between 0 and 5 + * + * _.random(1.2, 5.2); + * // => a floating-point number between 1.2 and 5.2 + */ + function random(lower, upper, floating) { + if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) { + upper = floating = undefined; + } + if (floating === undefined) { + if (typeof upper == 'boolean') { + floating = upper; + upper = undefined; + } + else if (typeof lower == 'boolean') { + floating = lower; + lower = undefined; + } + } + if (lower === undefined && upper === undefined) { + lower = 0; + upper = 1; + } + else { + lower = toFinite(lower); + if (upper === undefined) { + upper = lower; + lower = 0; + } else { + upper = toFinite(upper); + } + } + if (lower > upper) { + var temp = lower; + lower = upper; + upper = temp; + } + if (floating || lower % 1 || upper % 1) { + var rand = nativeRandom(); + return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper); + } + return baseRandom(lower, upper); + } + + /*------------------------------------------------------------------------*/ + + /** + * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the camel cased string. + * @example + * + * _.camelCase('Foo Bar'); + * // => 'fooBar' + * + * _.camelCase('--foo-bar--'); + * // => 'fooBar' + * + * _.camelCase('__FOO_BAR__'); + * // => 'fooBar' + */ + var camelCase = createCompounder(function(result, word, index) { + word = word.toLowerCase(); + return result + (index ? capitalize(word) : word); + }); + + /** + * Converts the first character of `string` to upper case and the remaining + * to lower case. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to capitalize. + * @returns {string} Returns the capitalized string. + * @example + * + * _.capitalize('FRED'); + * // => 'Fred' + */ + function capitalize(string) { + return upperFirst(toString(string).toLowerCase()); + } + + /** + * Deburrs `string` by converting + * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table) + * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A) + * letters to basic Latin letters and removing + * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to deburr. + * @returns {string} Returns the deburred string. + * @example + * + * _.deburr('déjà vu'); + * // => 'deja vu' + */ + function deburr(string) { + string = toString(string); + return string && string.replace(reLatin, deburrLetter).replace(reComboMark, ''); + } + + /** + * Checks if `string` ends with the given target string. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to inspect. + * @param {string} [target] The string to search for. + * @param {number} [position=string.length] The position to search up to. + * @returns {boolean} Returns `true` if `string` ends with `target`, + * else `false`. + * @example + * + * _.endsWith('abc', 'c'); + * // => true + * + * _.endsWith('abc', 'b'); + * // => false + * + * _.endsWith('abc', 'b', 2); + * // => true + */ + function endsWith(string, target, position) { + string = toString(string); + target = baseToString(target); + + var length = string.length; + position = position === undefined + ? length + : baseClamp(toInteger(position), 0, length); + + var end = position; + position -= target.length; + return position >= 0 && string.slice(position, end) == target; + } + + /** + * Converts the characters "&", "<", ">", '"', and "'" in `string` to their + * corresponding HTML entities. + * + * **Note:** No other characters are escaped. To escape additional + * characters use a third-party library like [_he_](https://mths.be/he). + * + * Though the ">" character is escaped for symmetry, characters like + * ">" and "/" don't need escaping in HTML and have no special meaning + * unless they're part of a tag or unquoted attribute value. See + * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands) + * (under "semi-related fun fact") for more details. + * + * When working with HTML you should always + * [quote attribute values](http://wonko.com/post/html-escaping) to reduce + * XSS vectors. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category String + * @param {string} [string=''] The string to escape. + * @returns {string} Returns the escaped string. + * @example + * + * _.escape('fred, barney, & pebbles'); + * // => 'fred, barney, & pebbles' + */ + function escape(string) { + string = toString(string); + return (string && reHasUnescapedHtml.test(string)) + ? string.replace(reUnescapedHtml, escapeHtmlChar) + : string; + } + + /** + * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+", + * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to escape. + * @returns {string} Returns the escaped string. + * @example + * + * _.escapeRegExp('[lodash](https://lodash.com/)'); + * // => '\[lodash\]\(https://lodash\.com/\)' + */ + function escapeRegExp(string) { + string = toString(string); + return (string && reHasRegExpChar.test(string)) + ? string.replace(reRegExpChar, '\\$&') + : string; + } + + /** + * Converts `string` to + * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the kebab cased string. + * @example + * + * _.kebabCase('Foo Bar'); + * // => 'foo-bar' + * + * _.kebabCase('fooBar'); + * // => 'foo-bar' + * + * _.kebabCase('__FOO_BAR__'); + * // => 'foo-bar' + */ + var kebabCase = createCompounder(function(result, word, index) { + return result + (index ? '-' : '') + word.toLowerCase(); + }); + + /** + * Converts `string`, as space separated words, to lower case. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the lower cased string. + * @example + * + * _.lowerCase('--Foo-Bar--'); + * // => 'foo bar' + * + * _.lowerCase('fooBar'); + * // => 'foo bar' + * + * _.lowerCase('__FOO_BAR__'); + * // => 'foo bar' + */ + var lowerCase = createCompounder(function(result, word, index) { + return result + (index ? ' ' : '') + word.toLowerCase(); + }); + + /** + * Converts the first character of `string` to lower case. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the converted string. + * @example + * + * _.lowerFirst('Fred'); + * // => 'fred' + * + * _.lowerFirst('FRED'); + * // => 'fRED' + */ + var lowerFirst = createCaseFirst('toLowerCase'); + + /** + * Pads `string` on the left and right sides if it's shorter than `length`. + * Padding characters are truncated if they can't be evenly divided by `length`. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.pad('abc', 8); + * // => ' abc ' + * + * _.pad('abc', 8, '_-'); + * // => '_-abc_-_' + * + * _.pad('abc', 3); + * // => 'abc' + */ + function pad(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + if (!length || strLength >= length) { + return string; + } + var mid = (length - strLength) / 2; + return ( + createPadding(nativeFloor(mid), chars) + + string + + createPadding(nativeCeil(mid), chars) + ); + } + + /** + * Pads `string` on the right side if it's shorter than `length`. Padding + * characters are truncated if they exceed `length`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.padEnd('abc', 6); + * // => 'abc ' + * + * _.padEnd('abc', 6, '_-'); + * // => 'abc_-_' + * + * _.padEnd('abc', 3); + * // => 'abc' + */ + function padEnd(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + return (length && strLength < length) + ? (string + createPadding(length - strLength, chars)) + : string; + } + + /** + * Pads `string` on the left side if it's shorter than `length`. Padding + * characters are truncated if they exceed `length`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to pad. + * @param {number} [length=0] The padding length. + * @param {string} [chars=' '] The string used as padding. + * @returns {string} Returns the padded string. + * @example + * + * _.padStart('abc', 6); + * // => ' abc' + * + * _.padStart('abc', 6, '_-'); + * // => '_-_abc' + * + * _.padStart('abc', 3); + * // => 'abc' + */ + function padStart(string, length, chars) { + string = toString(string); + length = toInteger(length); + + var strLength = length ? stringSize(string) : 0; + return (length && strLength < length) + ? (createPadding(length - strLength, chars) + string) + : string; + } + + /** + * Converts `string` to an integer of the specified radix. If `radix` is + * `undefined` or `0`, a `radix` of `10` is used unless `value` is a + * hexadecimal, in which case a `radix` of `16` is used. + * + * **Note:** This method aligns with the + * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`. + * + * @static + * @memberOf _ + * @since 1.1.0 + * @category String + * @param {string} string The string to convert. + * @param {number} [radix=10] The radix to interpret `value` by. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {number} Returns the converted integer. + * @example + * + * _.parseInt('08'); + * // => 8 + * + * _.map(['6', '08', '10'], _.parseInt); + * // => [6, 8, 10] + */ + function parseInt(string, radix, guard) { + if (guard || radix == null) { + radix = 0; + } else if (radix) { + radix = +radix; + } + return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0); + } + + /** + * Repeats the given string `n` times. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to repeat. + * @param {number} [n=1] The number of times to repeat the string. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {string} Returns the repeated string. + * @example + * + * _.repeat('*', 3); + * // => '***' + * + * _.repeat('abc', 2); + * // => 'abcabc' + * + * _.repeat('abc', 0); + * // => '' + */ + function repeat(string, n, guard) { + if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) { + n = 1; + } else { + n = toInteger(n); + } + return baseRepeat(toString(string), n); + } + + /** + * Replaces matches for `pattern` in `string` with `replacement`. + * + * **Note:** This method is based on + * [`String#replace`](https://mdn.io/String/replace). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to modify. + * @param {RegExp|string} pattern The pattern to replace. + * @param {Function|string} replacement The match replacement. + * @returns {string} Returns the modified string. + * @example + * + * _.replace('Hi Fred', 'Fred', 'Barney'); + * // => 'Hi Barney' + */ + function replace() { + var args = arguments, + string = toString(args[0]); + + return args.length < 3 ? string : string.replace(args[1], args[2]); + } + + /** + * Converts `string` to + * [snake case](https://en.wikipedia.org/wiki/Snake_case). + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the snake cased string. + * @example + * + * _.snakeCase('Foo Bar'); + * // => 'foo_bar' + * + * _.snakeCase('fooBar'); + * // => 'foo_bar' + * + * _.snakeCase('--FOO-BAR--'); + * // => 'foo_bar' + */ + var snakeCase = createCompounder(function(result, word, index) { + return result + (index ? '_' : '') + word.toLowerCase(); + }); + + /** + * Splits `string` by `separator`. + * + * **Note:** This method is based on + * [`String#split`](https://mdn.io/String/split). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category String + * @param {string} [string=''] The string to split. + * @param {RegExp|string} separator The separator pattern to split by. + * @param {number} [limit] The length to truncate results to. + * @returns {Array} Returns the string segments. + * @example + * + * _.split('a-b-c', '-', 2); + * // => ['a', 'b'] + */ + function split(string, separator, limit) { + if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) { + separator = limit = undefined; + } + limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0; + if (!limit) { + return []; + } + string = toString(string); + if (string && ( + typeof separator == 'string' || + (separator != null && !isRegExp(separator)) + )) { + separator = baseToString(separator); + if (!separator && hasUnicode(string)) { + return castSlice(stringToArray(string), 0, limit); + } + } + return string.split(separator, limit); + } + + /** + * Converts `string` to + * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage). + * + * @static + * @memberOf _ + * @since 3.1.0 + * @category String + * @param {string} [string=''] The string to convert. + * @returns {string} Returns the start cased string. + * @example + * + * _.startCase('--foo-bar--'); + * // => 'Foo Bar' + * + * _.startCase('fooBar'); + * // => 'Foo Bar' + * + * _.startCase('__FOO_BAR__'); + * // => 'FOO BAR' + */ + var startCase = createCompounder(function(result, word, index) { + return result + (index ? ' ' : '') + upperFirst(word); + }); + + /** + * Checks if `string` starts with the given target string. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category String + * @param {string} [string=''] The string to inspect. + * @param {string} [target] The string to search for. + * @param {number} [position=0] The position to search from. + * @returns {boolean} Returns `true` if `string` starts with `target`, + * else `false`. + * @example + * + * _.startsWith('abc', 'a'); + * // => true + * + * _.startsWith('abc', 'b'); + * // => false + * + * _.startsWith('abc', 'b', 1); + * // => true + */ + function startsWith(string, target, position) { + string = toString(string); + position = position == null + ? 0 + : baseClamp(toInteger(position), 0, string.length); + + target = baseToString(target); + return string.slice(position, position + target.length) == target; + } + + /** + * Creates a compiled template function that can interpolate data properties + * in "interpolate" delimiters, HTML-escape interpolated data properties in + * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data + * properties may be accessed as free variables in the template. If a setting + * object is given, it takes precedence over `_.templateSettings` values. + * + * **Note:** In the development build `_.template` utilizes + * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) + * for easier debugging. + * + * For more information on precompiling templates see + * [lodash's custom builds documentation](https://lodash.com/custom-builds). + * + * For more information on Chrome extension sandboxes see + * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval). + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category String + * @param {string} [string=''] The template string. + * @param {Object} [options={}] The options object. + * @param {RegExp} [options.escape=_.templateSettings.escape] + * The HTML "escape" delimiter. + * @param {RegExp} [options.evaluate=_.templateSettings.evaluate] + * The "evaluate" delimiter. + * @param {Object} [options.imports=_.templateSettings.imports] + * An object to import into the template as free variables. + * @param {RegExp} [options.interpolate=_.templateSettings.interpolate] + * The "interpolate" delimiter. + * @param {string} [options.sourceURL='lodash.templateSources[n]'] + * The sourceURL of the compiled template. + * @param {string} [options.variable='obj'] + * The data object variable name. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {Function} Returns the compiled template function. + * @example + * + * // Use the "interpolate" delimiter to create a compiled template. + * var compiled = _.template('hello <%= user %>!'); + * compiled({ 'user': 'fred' }); + * // => 'hello fred!' + * + * // Use the HTML "escape" delimiter to escape data property values. + * var compiled = _.template('<%- value %>'); + * compiled({ 'value': '