feat(arrMultiplier): add multiplier to Array (#241)

Author: vinodkhandelwal

src/array-multiplier.js

@@ -0,0 +1,15 @@
+export default arrMultiply
+
+
+/**
+ * Original source: https://stackoverflow.com/questions/8454977/
+ * how-do-i-multiply-each-member-of-an-array-by-a-scalar-in-javascript
+ * This method will perform Array multiplication with a number.
+ *
+ * @param {Array} array - Array to be multipled with a number
+ * @param {Number} multiplier - number to be multiply to each element of aray
+ * @return {Array} - Result of multiplication
+ */
+function arrMultiply(array, multiplier) {
+  return array.map(x => x * multiplier)
+}

src/index.js

@@ -90,6 +90,7 @@ import truncate from './truncate'
 import validateEmail from './validateEmail'
 import removeElementByIndex from './removeElementByIndex'
 import clone from './clone'
+import arrMultiply from './array-multiplier'
 
 export {
   reverseArrayInPlace,
@@ -184,4 +185,5 @@ export {
   hex2hsl,
   removeElementByIndex,
   clone,
+  arrMultiply,
 }

test/array-multiplier.test.js

@@ -0,0 +1,12 @@
+import test from 'ava'
+import {
+  arrMultiply,
+} from '../src'
+
+test('Multiply an array with a scaler number', t => {
+  const array = [1, 2, 3, 4]
+  const multiplier = 2
+  const expected = [2, 4, 6, 8]
+  const actual = arrMultiply(array, multiplier)
+  t.deepEqual(actual, expected)
+})