Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Flags: --harmony-arrays --harmony-generators |
| 6 | (function() { |
| 7 | |
| 8 | assertEquals(1, Array.from.length); |
| 9 | |
| 10 | function assertArrayLikeEquals(value, expected, type) { |
| 11 | assertInstanceof(value, type); |
| 12 | assertEquals(expected.length, value.length); |
| 13 | for (var i=0; i<value.length; ++i) { |
| 14 | assertEquals(expected[i], value[i]); |
| 15 | } |
| 16 | } |
| 17 | |
| 18 | // Assert that constructor is called with "length" for array-like objects |
| 19 | var myCollectionCalled = false; |
| 20 | function MyCollection(length) { |
| 21 | myCollectionCalled = true; |
| 22 | assertEquals(1, arguments.length); |
| 23 | assertEquals(5, length); |
| 24 | } |
| 25 | |
| 26 | Array.from.call(MyCollection, {length: 5}); |
| 27 | assertTrue(myCollectionCalled); |
| 28 | |
| 29 | // Assert that calling mapfn with / without thisArg in sloppy and strict modes |
| 30 | // works as expected. |
| 31 | var global = this; |
| 32 | function non_strict(){ assertEquals(global, this); } |
| 33 | function strict(){ "use strict"; assertEquals(void 0, this); } |
| 34 | function strict_null(){ "use strict"; assertEquals(null, this); } |
| 35 | Array.from([1], non_strict); |
| 36 | Array.from([1], non_strict, void 0); |
| 37 | Array.from([1], non_strict, null); |
| 38 | Array.from([1], strict); |
| 39 | Array.from([1], strict, void 0); |
| 40 | Array.from([1], strict_null, null); |
| 41 | |
| 42 | function testArrayFrom(thisArg, constructor) { |
| 43 | assertArrayLikeEquals(Array.from.call(thisArg, [], undefined), [], |
| 44 | constructor); |
| 45 | assertArrayLikeEquals(Array.from.call(thisArg, NaN), [], constructor); |
| 46 | assertArrayLikeEquals(Array.from.call(thisArg, Infinity), [], constructor); |
| 47 | assertArrayLikeEquals(Array.from.call(thisArg, 10000000), [], constructor); |
| 48 | assertArrayLikeEquals(Array.from.call(thisArg, 'test'), ['t', 'e', 's', 't'], |
| 49 | constructor); |
| 50 | |
| 51 | assertArrayLikeEquals(Array.from.call(thisArg, |
| 52 | { length: 1, '0': { 'foo': 'bar' } }), [{'foo': 'bar'}], constructor); |
| 53 | |
| 54 | assertArrayLikeEquals(Array.from.call(thisArg, |
| 55 | { length: -1, '0': { 'foo': 'bar' } }), [], constructor); |
| 56 | |
| 57 | assertArrayLikeEquals(Array.from.call(thisArg, |
| 58 | [ 'foo', 'bar', 'baz' ]), ['foo', 'bar', 'baz'], constructor); |
| 59 | |
| 60 | var kSet = new Set(['foo', 'bar', 'baz']); |
| 61 | assertArrayLikeEquals(Array.from.call(thisArg, kSet), ['foo', 'bar', 'baz'], |
| 62 | constructor); |
| 63 | |
| 64 | var kMap = new Map(['foo', 'bar', 'baz'].entries()); |
| 65 | assertArrayLikeEquals(Array.from.call(thisArg, kMap), |
| 66 | [[0, 'foo'], [1, 'bar'], [2, 'baz']], constructor); |
| 67 | |
| 68 | |
| 69 | function* generator() { |
| 70 | yield 'a'; |
| 71 | yield 'b'; |
| 72 | yield 'c'; |
| 73 | } |
| 74 | |
| 75 | assertArrayLikeEquals(Array.from.call(thisArg, generator()), |
| 76 | ['a', 'b', 'c'], constructor); |
| 77 | |
| 78 | // Mozilla: |
| 79 | // Array.from on a string handles surrogate pairs correctly. |
| 80 | var gclef = "\uD834\uDD1E"; // U+1D11E MUSICAL SYMBOL G CLEF |
| 81 | assertArrayLikeEquals(Array.from.call(thisArg, gclef), [gclef], constructor); |
| 82 | assertArrayLikeEquals(Array.from.call(thisArg, gclef + " G"), |
| 83 | [gclef, " ", "G"], constructor); |
| 84 | |
| 85 | assertArrayLikeEquals(Array.from.call(thisArg, 'test', function(x) { |
| 86 | return this.filter(x); |
| 87 | }, { |
| 88 | filter: function(x) { return x.toUpperCase(); } |
| 89 | }), ['T', 'E', 'S', 'T'], constructor); |
| 90 | assertArrayLikeEquals(Array.from.call(thisArg, 'test', function(x) { |
| 91 | return x.toUpperCase(); |
| 92 | }), ['T', 'E', 'S', 'T'], constructor); |
| 93 | |
| 94 | this.thisArg = thisArg; |
| 95 | assertThrows('Array.from.call(thisArg, null)', TypeError); |
| 96 | assertThrows('Array.from.call(thisArg, undefined)', TypeError); |
| 97 | assertThrows('Array.from.call(thisArg, [], null)', TypeError); |
| 98 | assertThrows('Array.from.call(thisArg, [], "noncallable")', TypeError); |
| 99 | |
| 100 | this.nullIterator = {}; |
| 101 | nullIterator[Symbol.iterator] = null; |
| 102 | assertThrows('Array.from.call(thisArg, nullIterator)', TypeError); |
| 103 | |
| 104 | this.nonObjIterator = {}; |
| 105 | nonObjIterator[Symbol.iterator] = function() { return "nonObject"; }; |
| 106 | assertThrows('Array.from.call(thisArg, nonObjIterator)', TypeError); |
| 107 | |
| 108 | assertThrows('Array.from.call(thisArg, [], null)', TypeError); |
| 109 | } |
| 110 | |
| 111 | function Other() {} |
| 112 | |
| 113 | var boundFn = (function() {}).bind(Array, 27); |
| 114 | |
| 115 | testArrayFrom(Array, Array); |
| 116 | testArrayFrom(null, Array); |
| 117 | testArrayFrom({}, Array); |
| 118 | testArrayFrom(Object, Object); |
| 119 | testArrayFrom(Other, Other); |
| 120 | testArrayFrom(Math.cos, Array); |
| 121 | testArrayFrom(boundFn, Array); |
| 122 | |
| 123 | })(); |