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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>
22 lines
846 B
JavaScript
22 lines
846 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 str1 = new String("yuck\uD83D\uDCA9")
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// String wrapper objects are not concat-spreadable by default
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assertEquals([str1], [].concat(str1));
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// String wrapper objects may be individually concat-spreadable
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str1[Symbol.isConcatSpreadable] = true;
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assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
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[].concat(str1));
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String.prototype[Symbol.isConcatSpreadable] = true;
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// String wrapper objects may be concat-spreadable
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assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
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[].concat(new String("yuck\uD83D\uDCA9")));
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// String values are never concat-spreadable
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assertEquals(["yuck\uD83D\uDCA9"], [].concat("yuck\uD83D\uDCA9"));
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