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9d7cd9b864
PR-URL: https://github.com/nodejs/node/pull/54077 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
// Copyright 2023 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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//
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// Flags: --allow-natives-syntax
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assertTrue(%NoElementsProtector());
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// Test holey elements that also trips the elements-on-Array-prototype
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// protector.
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let arr = [0, 1, 2, 3, , , , , 8, 9];
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let grouped = Object.groupBy(arr, () => {
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Array.prototype[5] = 42;
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});
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assertFalse(%NoElementsProtector());
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// 'undefined' is the only group.
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assertArrayEquals(['undefined'], Object.getOwnPropertyNames(grouped));
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let expectedGrouped = [0, 1, 2, 3, undefined, 42, undefined, undefined, 8, 9];
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assertArrayEquals(expectedGrouped, grouped['undefined']);
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delete Array.prototype[5];
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// Test slow elements that also trips the elements-on-Arr2ay-prototype
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// protector.
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let arr2 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
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let grouped2 = Object.groupBy(arr2, () => {
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delete arr2[4];
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delete arr2[5];
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delete arr2[6];
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delete arr2[7];
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Array.prototype[14] = 42;
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arr2.length = 20;
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});
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// 'undefined' is the only group.
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assertArrayEquals(['undefined'], Object.getOwnPropertyNames(grouped2));
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let expectedGrouped2 = [
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0, 1, 2, 3, undefined, undefined, undefined,
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undefined, 8, 9, undefined, undefined, undefined, undefined,
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42, undefined, undefined, undefined, undefined, undefined
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];
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assertArrayEquals(expectedGrouped2, grouped2['undefined']);
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