58 lines
2.1 KiB
JavaScript
58 lines
2.1 KiB
JavaScript
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// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Check that @@isConcatSpreadable is checked when set on Object.prototype
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// with a dictionary backing store.
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// Force Object.prototype into dictionary backing store by adding many
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// properties.
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for (var i = 0; i < 10*1000; i++) {
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Object.prototype['generatedProperty'+i] = true;
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}
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var array = [1, 2, 3];
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var object = {length: 1, '0': 'a'};
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function testConcatDefaults() {
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assertEquals(array, [].concat(array));
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assertEquals(array, array.concat([]));
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assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
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assertEquals([object], [].concat(object));
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assertEquals([1, 2, 3, object], array.concat(object));
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assertEquals([object], Array.prototype.concat.call(object,[]));
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assertEquals([object, 1, 2, 3], Array.prototype.concat.call(object, array));
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assertEquals([object, object], Array.prototype.concat.call(object, object));
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}
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testConcatDefaults();
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var concatSpreadable = false;
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Object.defineProperty(Object.prototype, Symbol.isConcatSpreadable, {
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get() { return concatSpreadable },
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configurable: true
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});
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assertEquals([[], array], [].concat(array));
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assertEquals([array, []], array.concat([]));
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assertEquals([array, array], array.concat(array));
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assertEquals([[], object], [].concat(object));
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assertEquals([array, object], array.concat(object));
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assertEquals([object, []], Array.prototype.concat.call(object,[]));
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assertEquals([object, array], Array.prototype.concat.call(object, array));
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assertEquals([object, object], Array.prototype.concat.call(object, object));
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concatSpreadable = true;
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assertEquals(array, [].concat(array));
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assertEquals(array, array.concat([]));
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assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
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assertEquals(['a'], [].concat(object));
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assertEquals([1, 2, 3, 'a'], array.concat(object));
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assertEquals(['a'], Array.prototype.concat.call(object,[]));
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assertEquals(['a', 1, 2, 3], Array.prototype.concat.call(object, array));
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assertEquals(['a', 'a'], Array.prototype.concat.call(object, object));
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delete Object.prototype[Symbol.isConcatSpreadable];
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testConcatDefaults();
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