21 lines
738 B
JavaScript
21 lines
738 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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// If @@isConcatSpreadable is not used, the value of IsArray(O)
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// is used to determine the spreadable property.
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class A extends Array {}
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var obj = [].concat(new A(1, 2, 3), new A(4, 5, 6), new A(7, 8, 9));
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assertEquals(9, obj.length);
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for (var i = 0; i < obj.length; ++i) {
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assertEquals(i + 1, obj[i]);
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}
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// TODO(caitp): when concat is called on instances of classes which extend
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// Array, they should:
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//
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// - return an instance of the class, rather than an Array instance (if from
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// same Realm)
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// - always treat such classes as concat-spreadable
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