mirror of
https://github.com/nodejs/node.git
synced 2025-05-21 12:25:12 +00:00
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>
44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
// Copyright 2022 the V8 project authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// Test OOB indexing on fast path.
|
|
let arr1 = [];
|
|
for (let i = 0; i < 32; i++) arr1.push(i);
|
|
let popped = false;
|
|
let grouped1 = Object.groupBy(arr1, () => {
|
|
// Pop all of the elements to trigger right-trimming of the elements
|
|
// FixedArray.
|
|
for (let i = 0, len = arr1.length; i < len; i++) {
|
|
arr1.pop();
|
|
}
|
|
});
|
|
// 'undefined' is the only group.
|
|
assertArrayEquals(['undefined'], Object.getOwnPropertyNames(grouped1));
|
|
// 0 the only value in the group because the grouping function pops the entire
|
|
// array.
|
|
let expectedGrouped1 = [0];
|
|
assertArrayEquals(expectedGrouped1, grouped1['undefined']);
|
|
|
|
// Test result ElementsKind deduction on fast path.
|
|
//
|
|
// Initial Smi array, but due to length truncation result is not a Smi array.
|
|
let arr2 = [0,1,2,3,4,5,6,7,8,9];
|
|
let grouped2 = Object.groupBy(arr2, () => { arr2.length = 2; });
|
|
// 'undefined' is the only group.
|
|
assertArrayEquals(['undefined'], Object.getOwnPropertyNames(grouped2));
|
|
// 0,1 are the only values in the group because the source array gets truncated
|
|
// to length 2.
|
|
let expectedGrouped2 = [0,1];
|
|
assertArrayEquals(expectedGrouped2, grouped2['undefined']);
|
|
|
|
// Test holey elements
|
|
let arr3 = [0, 1, 2, 3, , , , , 8, 9];
|
|
let grouped3 = Object.groupBy(arr3, () => {});
|
|
// 'undefined' is the only group.
|
|
assertArrayEquals(['undefined'], Object.getOwnPropertyNames(grouped3));
|
|
|
|
let expectedGrouped3 =
|
|
[0, 1, 2, 3, undefined, undefined, undefined, undefined, 8, 9];
|
|
assertArrayEquals(expectedGrouped3, grouped3['undefined']);
|