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Side by Side Diff: test/mjsunit/harmony/array-concat-object-proto.js

Issue 1409123003: [runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: merging with master Created 4 years, 7 months ago
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1 // Copyright 2016 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 // Check that @@isConcatSpreadable is checked when set on Object.prototype
6
7 "use strict"
8
9 var array = [1, 2, 3];
10 var object = {length: 1, '0': 'a'};
11
12 function testConcatDefaults() {
13 assertEquals(array, [].concat(array));
14 assertEquals(array, array.concat([]));
15 assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
16 assertEquals([object], [].concat(object));
17 assertEquals([1, 2, 3, object], array.concat(object));
18 assertEquals([object], Array.prototype.concat.call(object,[]));
19 assertEquals([object, 1, 2, 3], Array.prototype.concat.call(object, array));
20 assertEquals([object, object], Array.prototype.concat.call(object, object));
21 }
22
23 testConcatDefaults();
24
25 Object.prototype[Symbol.isConcatSpreadable] = false;
26
27 assertEquals([[], array], [].concat(array));
28 assertEquals([array, []], array.concat([]));
29 assertEquals([array, array], array.concat(array));
30 assertEquals([[], object], [].concat(object));
31 assertEquals([array, object], array.concat(object));
32 assertEquals([object, []], Array.prototype.concat.call(object,[]));
33 assertEquals([object, array], Array.prototype.concat.call(object, array));
34 assertEquals([object, object], Array.prototype.concat.call(object, object));
35
36 Object.prototype[Symbol.isConcatSpreadable] = true;
37
38 assertEquals(array, [].concat(array));
39 assertEquals(array, array.concat([]));
40 assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
41 assertEquals(['a'], [].concat(object));
42 assertEquals([1, 2, 3, 'a'], array.concat(object));
43 assertEquals(['a'], Array.prototype.concat.call(object,[]));
44 assertEquals(['a', 1, 2, 3], Array.prototype.concat.call(object, array));
45 assertEquals(['a', 'a'], Array.prototype.concat.call(object, object));
46
47 delete Object.prototype[Symbol.isConcatSpreadable];
48 testConcatDefaults();
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