A tiny sync promise lib
sync-p is 55 lines of code, but handles the majority of the promise spec. Some of the spec is intentionally avoided, e.g.
- sync-p is capable of returning synchronously, i.e. it does not defer everything
- to avoid bloat sync-p assumes that truthy args passed to .then are functions (strict adherence involves explicitly handling cases like .then(5) ...like, just don't do that, that's not the api)
- it does not throw if a promise is rejected and no reject handler is attached
npm install sync-p
var Promise = require('sync-p')
var result
var p = new Promise(function (resolve, reject) {
// resolve immediately
resolve(true)
})
.then(null, null)
.then(function (val) {
result = val
})
console.log(result) // true
new Promise(function (resolve, reject) {
throw 'error'
})
.catch(function (err) {
console.log(err) // 'error'
})
var p = new Promise(function (resolve, reject) {
setTimeout(function () {
resolve(true)
}, 0)
})
.then(onSuccess, onError)
var all = require('sync-p/all')
var p = all([1, 2, promise3]).then(function (val) {
console.log(val) // [1, 2, 3]
})
var p = any([promise1, promise2, 3]).then(function (val) {
console.log(val) // 3
})
var p = any([promise1, promise2, promise3]).catch(function (err) {
console.log(err) // [err1, err2, err3]
})
// ... etc.var Promise = require('sync-p/extra')
// includes all, resolve, reject and defer
var promise = Promise.all(array)
var resolved = Promise.resolve(123)
var rejected = Promise.reject(321)
var deferred = Promise.defer()
var race = Promise.race(array)
var any = Promise.any(array)npm test
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