diff options
author | Luke "Jared" Bennett <lbennett@gitlab.com> | 2016-11-23 18:54:35 +0300 |
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committer | Luke "Jared" Bennett <lbennett@gitlab.com> | 2016-11-25 19:25:19 +0300 |
commit | 260749e1648956479cf8a814862fcfa21f8f71fd (patch) | |
tree | 3548dfba20e2e67081e942cac1aaa212caf86fd2 | |
parent | fc0350118385df28e435488cbf4be35e5cfbe70b (diff) |
Add `.find` poly
-rw-r--r-- | app/assets/javascripts/extensions/array.js | 8 | ||||
-rw-r--r-- | app/assets/javascripts/extensions/array.js.es6 | 24 | ||||
-rw-r--r-- | spec/javascripts/extensions/array_spec.js | 23 | ||||
-rw-r--r-- | spec/javascripts/extensions/array_spec.js.es6 | 46 |
4 files changed, 70 insertions, 31 deletions
diff --git a/app/assets/javascripts/extensions/array.js b/app/assets/javascripts/extensions/array.js deleted file mode 100644 index fc6c130113d..00000000000 --- a/app/assets/javascripts/extensions/array.js +++ /dev/null @@ -1,8 +0,0 @@ -/* eslint-disable no-extend-native, func-names, space-before-function-paren, semi, space-infix-ops, max-len */ -Array.prototype.first = function() { - return this[0]; -} - -Array.prototype.last = function() { - return this[this.length-1]; -} diff --git a/app/assets/javascripts/extensions/array.js.es6 b/app/assets/javascripts/extensions/array.js.es6 new file mode 100644 index 00000000000..717566a4715 --- /dev/null +++ b/app/assets/javascripts/extensions/array.js.es6 @@ -0,0 +1,24 @@ +/* eslint-disable no-extend-native, func-names, space-before-function-paren, semi, space-infix-ops, max-len */ +Array.prototype.first = function() { + return this[0]; +} + +Array.prototype.last = function() { + return this[this.length-1]; +} + +Array.prototype.find = Array.prototype.find || function(predicate, ...args) { + if (!this) throw new TypeError('Array.prototype.find called on null or undefined'); + if (typeof predicate !== 'function') throw new TypeError('predicate must be a function'); + + const list = Object(this); + const thisArg = args[1]; + let value = {}; + + for (let i = 0; i < list.length; i += 1) { + value = list[i]; + if (predicate.call(thisArg, value, i, list)) return value; + } + + return undefined; +}; diff --git a/spec/javascripts/extensions/array_spec.js b/spec/javascripts/extensions/array_spec.js deleted file mode 100644 index c56e6c7789b..00000000000 --- a/spec/javascripts/extensions/array_spec.js +++ /dev/null @@ -1,23 +0,0 @@ -/* eslint-disable space-before-function-paren, no-var, padded-blocks */ - -/*= require extensions/array */ - -(function() { - describe('Array extensions', function() { - describe('first', function() { - return it('returns the first item', function() { - var arr; - arr = [0, 1, 2, 3, 4, 5]; - return expect(arr.first()).toBe(0); - }); - }); - return describe('last', function() { - return it('returns the last item', function() { - var arr; - arr = [0, 1, 2, 3, 4, 5]; - return expect(arr.last()).toBe(5); - }); - }); - }); - -}).call(this); diff --git a/spec/javascripts/extensions/array_spec.js.es6 b/spec/javascripts/extensions/array_spec.js.es6 new file mode 100644 index 00000000000..2ec759c8e80 --- /dev/null +++ b/spec/javascripts/extensions/array_spec.js.es6 @@ -0,0 +1,46 @@ +/* eslint-disable space-before-function-paren, no-var, padded-blocks */ + +/*= require extensions/array */ + +(function() { + describe('Array extensions', function() { + describe('first', function() { + return it('returns the first item', function() { + var arr; + arr = [0, 1, 2, 3, 4, 5]; + return expect(arr.first()).toBe(0); + }); + }); + describe('last', function() { + return it('returns the last item', function() { + var arr; + arr = [0, 1, 2, 3, 4, 5]; + return expect(arr.last()).toBe(5); + }); + }); + + describe('find', function () { + beforeEach(() => { + this.arr = [0, 1, 2, 3, 4, 5]; + }); + + it('returns the item that first passes the predicate function', () => { + expect(this.arr.find(item => item === 2)).toBe(2); + }); + + it('returns undefined if no items pass the predicate function', () => { + expect(this.arr.find(item => item === 6)).not.toBeDefined(); + }); + + it('error when called on undefined or null', () => { + expect(Array.prototype.find.bind(undefined, item => item === 1)).toThrow(); + expect(Array.prototype.find.bind(null, item => item === 1)).toThrow(); + }); + + it('error when predicate is not a function', () => { + expect(Array.prototype.find.bind(this.arr, 1)).toThrow(); + }); + }); + }); + +}).call(this); |