| // Copyright 2014 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Based on Mozilla Array.of() tests at http://dxr.mozilla.org/mozilla-central/source/js/src/jit-test/tests/collections |
| |
| // Flags: --harmony-arrays |
| |
| |
| |
| // Array.of makes real arrays. |
| |
| function check(a) { |
| assertEquals(Object.getPrototypeOf(a), Array.prototype); |
| assertEquals(Array.isArray(a), true); |
| a[9] = 9; |
| assertEquals(a.length, 10); |
| } |
| |
| |
| check(Array.of()); |
| check(Array.of(0)); |
| check(Array.of(0, 1, 2)); |
| var f = Array.of; |
| check(f()); |
| |
| |
| // Array.of basics |
| |
| var a = Array.of(); |
| |
| assertEquals(a.length, 0); |
| a = Array.of(undefined, null, 3.14, []); |
| assertEquals(a, [undefined, null, 3.14, []]); |
| a = []; |
| for (var i = 0; i < 1000; i++) |
| a[i] = i; |
| assertEquals(Array.of.apply(null, a), a); |
| |
| |
| // Array.of does not leave holes |
| |
| assertEquals(Array.of(undefined), [undefined]); |
| assertEquals(Array.of(undefined, undefined), [undefined, undefined]); |
| assertEquals(Array.of.apply(null, [,,undefined]), [undefined, undefined, undefined]); |
| assertEquals(Array.of.apply(null, Array(4)), [undefined, undefined, undefined, undefined]); |
| |
| |
| // Array.of can be transplanted to other classes. |
| |
| var hits = 0; |
| function Bag() { |
| hits++; |
| } |
| Bag.of = Array.of; |
| |
| hits = 0; |
| var actual = Bag.of("zero", "one"); |
| assertEquals(hits, 1); |
| |
| hits = 0; |
| var expected = new Bag; |
| expected[0] = "zero"; |
| expected[1] = "one"; |
| expected.length = 2; |
| assertEquals(areSame(actual, expected), true); |
| |
| hits = 0; |
| actual = Array.of.call(Bag, "zero", "one"); |
| assertEquals(hits, 1); |
| assertEquals(areSame(actual, expected), true); |
| |
| function areSame(object, array) { |
| var result = object.length == array.length; |
| for (var i = 0; i < object.length; i++) { |
| result = result && object[i] == array[i]; |
| } |
| return result; |
| } |
| |
| |
| // Array.of does not trigger prototype setters. |
| // (It defines elements rather than assigning to them.) |
| |
| var status = "pass"; |
| Object.defineProperty(Array.prototype, "0", {set: function(v) {status = "FAIL 1"}}); |
| assertEquals(Array.of(1)[0], 1); |
| assertEquals(status, "pass"); |
| |
| Object.defineProperty(Bag.prototype, "0", {set: function(v) {status = "FAIL 2"}}); |
| assertEquals(Bag.of(1)[0], 1); |
| assertEquals(status, "pass"); |
| |
| |
| // Array.of passes the number of arguments to the constructor it calls. |
| |
| var hits = 0; |
| |
| function Herd(n) { |
| assertEquals(arguments.length, 1); |
| assertEquals(n, 5); |
| hits++; |
| } |
| |
| Herd.of = Array.of; |
| Herd.of("sheep", "cattle", "elephants", "whales", "seals"); |
| assertEquals(hits, 1); |
| |
| |
| // Array.of calls a "length" setter if one is present. |
| |
| var hits = 0; |
| var lastObj = null, lastVal = undefined; |
| function setter(v) { |
| hits++; |
| lastObj = this; |
| lastVal = v; |
| } |
| |
| // when the setter is on the new object |
| function Pack() { |
| Object.defineProperty(this, "length", {set: setter}); |
| } |
| Pack.of = Array.of; |
| var pack = Pack.of("wolves", "cards", "cigarettes", "lies"); |
| assertEquals(lastObj, pack); |
| assertEquals(lastVal, 4); |
| |
| // when the setter is on the new object's prototype |
| function Bevy() {} |
| Object.defineProperty(Bevy.prototype, "length", {set: setter}); |
| Bevy.of = Array.of; |
| var bevy = Bevy.of("quail"); |
| assertEquals(lastObj, bevy); |
| assertEquals(lastVal, 1); |
| |
| |
| // Array.of does a strict assignment to the new object's .length. |
| // The assignment is strict even if the code we're calling from is not strict. |
| |
| function Empty() {} |
| Empty.of = Array.of; |
| Object.defineProperty(Empty.prototype, "length", {get: function() { return 0; }}); |
| |
| var nothing = new Empty; |
| nothing.length = 2; // no exception; this is not a strict mode assignment |
| |
| assertThrows(function() { Empty.of(); }, TypeError); |
| |
| |
| // Check superficial features of Array.of. |
| |
| var desc = Object.getOwnPropertyDescriptor(Array, "of"); |
| |
| assertEquals(desc.configurable, true); |
| assertEquals(desc.enumerable, false); |
| assertEquals(desc.writable, true); |
| assertEquals(Array.of.length, 0); |
| assertThrows(function() { new Array.of() }, TypeError); // not a constructor |
| |
| // When the this-value passed in is not a constructor, the result is an array. |
| [undefined, null, false, "cow"].forEach(function(val) { |
| assertEquals(Array.isArray(Array.of(val)), true); |
| }); |