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PR-URL: https://github.com/nodejs/node/pull/47251 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
// Copyright 2018 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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// Test spreading of holey arrays. Holes should be replaced with undefined.
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var a = [, 2];
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assertEquals([undefined, 2], [...a]);
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assertTrue([...a].hasOwnProperty(0));
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assertTrue([2, ...a].hasOwnProperty(1));
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class MyArray1 extends Array {
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constructor(a) {
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super(...a);
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}
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}
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var myarr1 = new MyArray1(a);
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assertEquals(undefined, myarr1[0]);
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assertTrue(myarr1.hasOwnProperty(0));
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class MyArray2 extends Array {
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constructor(a) {
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super(2, ...a);
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}
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}
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var myarr2 = new MyArray2(a);
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assertEquals(undefined, myarr2[1]);
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assertTrue(myarr2.hasOwnProperty(1));
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function foo0() { return arguments.hasOwnProperty(0); }
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assertTrue(foo0(...a));
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function foo1() { return arguments.hasOwnProperty(1); }
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assertTrue(foo1(2, ...a));
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// This test pollutes the Array prototype. No more tests should be run in the
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// same instance after this.
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a.__proto__[0] = 1;
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var arr2 = [...a];
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assertEquals([1,2], arr2);
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assertTrue(arr2.hasOwnProperty(0));
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myarr1 = new MyArray1(a);
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assertEquals(1, myarr1[0]);
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assertTrue(myarr1.hasOwnProperty(0));
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var myarr2 = new MyArray2(a);
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assertEquals(1, myarr2[1]);
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assertTrue(myarr2.hasOwnProperty(1));
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