Merge pull request #19 from kentcdodds/pr/array-fill

feat: Add array-fill method 👍

Author: Kent C. Dodds

src/array-fill.js

@@ -0,0 +1,15 @@
+export default fill
+
+/**
+ * Original Source: http://stackoverflow.com/a/13735425/971592
+ *
+ * This method will return an array with the given value prefilled
+ *
+ * @param {Array} array - the array to fill
+ * @param {*} value - The value to prefill
+ * @return {Array} - The prefilled array
+ */
+function fill(array, value) {
+  return Array.apply(null, array).map(value.constructor.prototype.valueOf, value)
+}
+

src/index.js

@@ -3,12 +3,13 @@ import getQueryStringParam from './get-query-string-param'
 import snakeToCamel from './snake-to-camel'
 import padLeft from './pad-left'
 import randomInteger from './random-integer'
-
+import arrayFill from './array-fill'
 
 export {
   flatten,
   snakeToCamel,
   getQueryStringParam,
   padLeft,
   randomInteger,
+  arrayFill,
 }

test/array-fill.js

@@ -0,0 +1,26 @@
+import test from 'ava'
+import {arrayFill} from '../src'
+
+test('fills an array with a number', t => {
+  const original = [1, 2, 3, 4]
+  const expected = [7, 7, 7, 7]
+  const actual = arrayFill(original, 7)
+  t.same(actual, expected)
+})
+
+test('fills an array with a string', t => {
+  const original = Array(4)
+  const expected = ['wookie', 'wookie', 'wookie', 'wookie']
+  const actual = arrayFill(original, 'wookie')
+  t.same(actual, expected)
+})
+
+test('fills an array with a boolean', t => {
+  const original = Array(4)
+  const expected = [false, false, false, false]
+  const actual = arrayFill(original, false)
+  t.same(actual, expected)
+})
+
+test.todo('allow for non-primitive values like objects, arrays, and dates')
+