27 lines
919 B
JavaScript
27 lines
919 B
JavaScript
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// Copyright 2014 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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"use strict";
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var bool = new Boolean(true)
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// Boolean wrapper objects are not concat-spreadable by default
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assertEquals([bool], [].concat(bool));
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// Boolean wrapper objects may be individually concat-spreadable
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bool[Symbol.isConcatSpreadable] = true;
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bool.length = 3;
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bool[0] = 1, bool[1] = 2, bool[2] = 3;
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assertEquals([1, 2, 3], [].concat(bool));
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Boolean.prototype[Symbol.isConcatSpreadable] = true;
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// Boolean wrapper objects may be concat-spreadable
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assertEquals([], [].concat(new Boolean(true)));
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Boolean.prototype[0] = 1;
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Boolean.prototype[1] = 2;
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Boolean.prototype[2] = 3;
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Boolean.prototype.length = 3;
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assertEquals([1,2,3], [].concat(new Boolean(true)));
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// Boolean values are never concat-spreadable
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assertEquals([true], [].concat(true));
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