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| 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 // Based on Mozilla Array.of() tests at http://dxr.mozilla.org/mozilla-central/s
ource/js/src/jit-test/tests/collections | |
| 6 | |
| 7 // Flags: --harmony-arrays | |
| 8 | |
| 9 | |
| 10 | |
| 11 // Array.of makes real arrays. | |
| 12 | |
| 13 function check(a) { | |
| 14 assertEquals(Object.getPrototypeOf(a), Array.prototype); | |
| 15 assertEquals(Array.isArray(a), true); | |
| 16 a[9] = 9; | |
| 17 assertEquals(a.length, 10); | |
| 18 } | |
| 19 | |
| 20 | |
| 21 check(Array.of()); | |
| 22 check(Array.of(0)); | |
| 23 check(Array.of(0, 1, 2)); | |
| 24 var f = Array.of; | |
| 25 check(f()); | |
| 26 | |
| 27 | |
| 28 // Array.of basics | |
| 29 | |
| 30 var a = Array.of(); | |
| 31 | |
| 32 assertEquals(a.length, 0); | |
| 33 a = Array.of(undefined, null, 3.14, []); | |
| 34 assertEquals(a, [undefined, null, 3.14, []]); | |
| 35 a = []; | |
| 36 for (var i = 0; i < 1000; i++) | |
| 37 a[i] = i; | |
| 38 assertEquals(Array.of.apply(null, a), a); | |
| 39 | |
| 40 | |
| 41 // Array.of does not leave holes | |
| 42 | |
| 43 assertEquals(Array.of(undefined), [undefined]); | |
| 44 assertEquals(Array.of(undefined, undefined), [undefined, undefined]); | |
| 45 assertEquals(Array.of.apply(null, [,,undefined]), [undefined, undefined, undefin
ed]); | |
| 46 assertEquals(Array.of.apply(null, Array(4)), [undefined, undefined, undefined, u
ndefined]); | |
| 47 | |
| 48 | |
| 49 // Array.of can be transplanted to other classes. | |
| 50 | |
| 51 var hits = 0; | |
| 52 function Bag() { | |
| 53 hits++; | |
| 54 } | |
| 55 Bag.of = Array.of; | |
| 56 | |
| 57 hits = 0; | |
| 58 var actual = Bag.of("zero", "one"); | |
| 59 assertEquals(hits, 1); | |
| 60 | |
| 61 hits = 0; | |
| 62 var expected = new Bag; | |
| 63 expected[0] = "zero"; | |
| 64 expected[1] = "one"; | |
| 65 expected.length = 2; | |
| 66 assertEquals(areSame(actual, expected), true); | |
| 67 | |
| 68 hits = 0; | |
| 69 actual = Array.of.call(Bag, "zero", "one"); | |
| 70 assertEquals(hits, 1); | |
| 71 assertEquals(areSame(actual, expected), true); | |
| 72 | |
| 73 function areSame(object, array) { | |
| 74 var result = object.length == array.length; | |
| 75 for (var i = 0; i < object.length; i++) { | |
| 76 result = result && object[i] == array[i]; | |
| 77 } | |
| 78 return result; | |
| 79 } | |
| 80 | |
| 81 | |
| 82 // Array.of does not trigger prototype setters. | |
| 83 // (It defines elements rather than assigning to them.) | |
| 84 | |
| 85 var status = "pass"; | |
| 86 Object.defineProperty(Array.prototype, "0", {set: function(v) {status = "FAIL 1"
}}); | |
| 87 assertEquals(Array.of(1)[0], 1); | |
| 88 assertEquals(status, "pass"); | |
| 89 | |
| 90 Object.defineProperty(Bag.prototype, "0", {set: function(v) {status = "FAIL 2"}}
); | |
| 91 assertEquals(Bag.of(1)[0], 1); | |
| 92 assertEquals(status, "pass"); | |
| 93 | |
| 94 | |
| 95 // Array.of passes the number of arguments to the constructor it calls. | |
| 96 | |
| 97 var hits = 0; | |
| 98 | |
| 99 function Herd(n) { | |
| 100 assertEquals(arguments.length, 1); | |
| 101 assertEquals(n, 5); | |
| 102 hits++; | |
| 103 } | |
| 104 | |
| 105 Herd.of = Array.of; | |
| 106 Herd.of("sheep", "cattle", "elephants", "whales", "seals"); | |
| 107 assertEquals(hits, 1); | |
| 108 | |
| 109 | |
| 110 // Array.of calls a "length" setter if one is present. | |
| 111 | |
| 112 var hits = 0; | |
| 113 var lastObj = null, lastVal = undefined; | |
| 114 function setter(v) { | |
| 115 hits++; | |
| 116 lastObj = this; | |
| 117 lastVal = v; | |
| 118 } | |
| 119 | |
| 120 // when the setter is on the new object | |
| 121 function Pack() { | |
| 122 Object.defineProperty(this, "length", {set: setter}); | |
| 123 } | |
| 124 Pack.of = Array.of; | |
| 125 var pack = Pack.of("wolves", "cards", "cigarettes", "lies"); | |
| 126 assertEquals(lastObj, pack); | |
| 127 assertEquals(lastVal, 4); | |
| 128 | |
| 129 // when the setter is on the new object's prototype | |
| 130 function Bevy() {} | |
| 131 Object.defineProperty(Bevy.prototype, "length", {set: setter}); | |
| 132 Bevy.of = Array.of; | |
| 133 var bevy = Bevy.of("quail"); | |
| 134 assertEquals(lastObj, bevy); | |
| 135 assertEquals(lastVal, 1); | |
| 136 | |
| 137 | |
| 138 // Array.of does a strict assignment to the new object's .length. | |
| 139 // The assignment is strict even if the code we're calling from is not strict. | |
| 140 | |
| 141 function Empty() {} | |
| 142 Empty.of = Array.of; | |
| 143 Object.defineProperty(Empty.prototype, "length", {get: function() { return 0; }}
); | |
| 144 | |
| 145 var nothing = new Empty; | |
| 146 nothing.length = 2; // no exception; this is not a strict mode assignment | |
| 147 | |
| 148 assertThrows(function() { Empty.of(); }, TypeError); | |
| 149 | |
| 150 | |
| 151 // Check superficial features of Array.of. | |
| 152 | |
| 153 var desc = Object.getOwnPropertyDescriptor(Array, "of"); | |
| 154 | |
| 155 assertEquals(desc.configurable, true); | |
| 156 assertEquals(desc.enumerable, false); | |
| 157 assertEquals(desc.writable, true); | |
| 158 assertEquals(Array.of.length, 0); | |
| 159 assertThrows(function() { new Array.of() }, TypeError); // not a constructor | |
| 160 | |
| 161 // When the this-value passed in is not a constructor, the result is an array. | |
| 162 [ | |
| 163 undefined, | |
| 164 null, | |
| 165 false, | |
| 166 "cow", | |
| 167 NaN, | |
| 168 67, | |
| 169 Infinity, | |
| 170 -Infinity, | |
| 171 Math.cos, // builtin functions with no [[Construct]] slot | |
| 172 Math.cos.bind(Math) // bound builtin functions with no [[Construct]] slot | |
| 173 ].forEach(function(val) { | |
| 174 assertEquals(Array.isArray(Array.of.call(val, val)), true); | |
| 175 }); | |
| 176 | |
| 177 | |
| 178 (function testBoundConstructor() { | |
| 179 var boundFn = (function() {}).bind(null); | |
| 180 var instance = Array.of.call(boundFn, 1, 2, 3); | |
| 181 assertEquals(instance.length, 3); | |
| 182 assertEquals(instance instanceof boundFn, true); | |
| 183 assertEquals(Array.isArray(instance), false); | |
| 184 })(); | |
| 185 | |
| 186 (function testDefinesOwnProperty() { | |
| 187 // Assert that [[DefineOwnProperty]] is used in ArrayFrom, meaning a | |
| 188 // setter isn't called, and a failed [[DefineOwnProperty]] will throw. | |
| 189 var setterCalled = 0; | |
| 190 function exotic() { | |
| 191 Object.defineProperty(this, '0', { | |
| 192 get: function() { return 2; }, | |
| 193 set: function() { setterCalled++; } | |
| 194 }); | |
| 195 } | |
| 196 // Non-configurable properties can't be overwritten with DefineOwnProperty | |
| 197 assertThrows(function () { Array.of.call(exotic, 1); }, TypeError); | |
| 198 // The setter wasn't called | |
| 199 assertEquals(0, setterCalled); | |
| 200 | |
| 201 // Check that array properties defined are writable, enumerable, configurable | |
| 202 function ordinary() { } | |
| 203 var x = Array.of.call(ordinary, 2); | |
| 204 var xlength = Object.getOwnPropertyDescriptor(x, 'length'); | |
| 205 assertEquals(1, xlength.value); | |
| 206 assertEquals(true, xlength.writable); | |
| 207 assertEquals(true, xlength.enumerable); | |
| 208 assertEquals(true, xlength.configurable); | |
| 209 var x0 = Object.getOwnPropertyDescriptor(x, 0); | |
| 210 assertEquals(2, x0.value); | |
| 211 assertEquals(true, xlength.writable); | |
| 212 assertEquals(true, xlength.enumerable); | |
| 213 assertEquals(true, xlength.configurable); | |
| 214 })(); | |
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