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2883c855e0
PR-URL: https://github.com/nodejs/node/pull/32116 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
27 lines
896 B
JavaScript
27 lines
896 B
JavaScript
// 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 num = new Number(true)
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// Number wrapper objects are not concat-spreadable by default
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assertEquals([num], [].concat(num));
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// Number wrapper objects may be individually concat-spreadable
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num[Symbol.isConcatSpreadable] = true;
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num.length = 3;
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num[0] = 1, num[1] = 2, num[2] = 3;
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assertEquals([1, 2, 3], [].concat(num));
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Number.prototype[Symbol.isConcatSpreadable] = true;
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// Number wrapper objects may be concat-spreadable
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assertEquals([], [].concat(new Number(123)));
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Number.prototype[0] = 1;
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Number.prototype[1] = 2;
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Number.prototype[2] = 3;
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Number.prototype.length = 3;
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assertEquals([1,2,3], [].concat(new Number(123)));
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// Number values are never concat-spreadable
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assertEquals([true], [].concat(true));
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