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34 lines
886 B
JavaScript
34 lines
886 B
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 22.1.1
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description: Subclassing Array
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info: |
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22.1.1 The Array Constructor
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The Array constructor is designed to be subclassable. It may be used as the
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value of an extends clause of a class definition. (...)
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includes: [compareArray.js]
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---*/
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class Sub extends Array {}
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var a1 = new Sub(42, 'foo');
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assert.sameValue(a1.length, 2);
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assert.sameValue(a1[0], 42);
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assert.sameValue(a1[1], 'foo');
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a1.push(true);
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assert.sameValue(a1.length, 3, 'Array#push updates the length property');
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assert.sameValue(a1[0], 42);
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assert.sameValue(a1[1], 'foo');
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assert.sameValue(a1[2], true, 'Adds new item');
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var a2 = new Sub(7);
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assert.sameValue(a2.length, 7);
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var a3 = new Sub();
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assert.compareArray(a3, []);
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assert.sameValue(a3.length, 0);
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