feat(contains): Add contains function (#128)

* feat(contains): Add contains function

* Fixing linting errors for hex2rgb.test.js

Author: josediazse

src/contains.js

@@ -0,0 +1,22 @@
+export default contains
+
+/**
+ * Original Source: https://stackoverflow.com/questions/237104
+ *
+ * Checks if a given element is present in an array.
+ *
+ * @param {Object[]} array - the array to scan for the given element.
+ * @param {Object} element - the element to look for.
+ *
+ * @returns {boolean} true if array contains element, false otherwise
+ */
+function contains(array, element) {
+  let result = false
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] === element) {
+      result = true
+      break
+    }
+  }
+  return result
+}

src/index.js

@@ -44,6 +44,7 @@ import slugify from './slugify'
 import convertToRoman from './convertToRoman'
 import gcd from './gcd'
 import range from './range'
+import contains from './contains'
 
 export {
   isOdd,
@@ -92,4 +93,5 @@ export {
   convertToRoman,
   gcd,
   range,
+  contains,
 }

test/contains.test.js

@@ -0,0 +1,10 @@
+import test from 'ava'
+import {contains} from '../src'
+
+test('array contains element', t => {
+  t.true(contains([1, 2, 3], 3))
+})
+
+test('array does not contain element', t => {
+  t.false(contains([1, 2, 3], 4))
+})

test/hex2rgb.test.js

@@ -1,22 +1,22 @@
 import test from 'ava'
 import {hex2rgb} from '../src'
 
-test('test hex without opacity value', t=>{
+test('test hex without opacity value', t => {
   const hex = '#ff0000'
   const expected = 'rgba(255,0,0)'
   const actual = hex2rgb(hex)
   t.deepEqual(actual, expected)
 })
 
-test('test hex with opacity value', t=>{
+test('test hex with opacity value', t => {
   const hex = '#ff0000'
   const opacity = 1
   const expected = 'rgba(255,0,0,1)'
-  const actual = hex2rgb(hex,opacity)
-  t.deepEqual(actual,expected)
+  const actual = hex2rgb(hex, opacity)
+  t.deepEqual(actual, expected)
 })
 
-test('test short hex without opacity value', t=>{
+test('test short hex without opacity value', t => {
   const hex = '#f00'
   const expected = 'rgba(255,0,0)'
   const actual = hex2rgb(hex)