4a75168479
This is an unmodified reland of ece86adc6b.
Original change's description:
> [typedarray] Properly convert hole to undefined in TypedArray.from
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> It used to call the old IterableToList, which had the wrong
> semantics for holes.
>
> Bug: v8:8133
> Change-Id: Idd5acd55a155bc43df7552135a44151bb2db38e9
> Reviewed-on: https://chromium-review.googlesource.com/1213204
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Commit-Queue: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55745}
Tbr: petermarshall@chromium.org
Bug: v8:8133
Change-Id: I91c1eaf61cbcc29116e3a6cc3415f29cfba3561e
Reviewed-on: https://chromium-review.googlesource.com/1223007
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55846}
18 lines
619 B
JavaScript
18 lines
619 B
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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const arr = [1, , 3];
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function mapper(x) {
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Array.prototype[1] = 2;
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return x + 1;
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}
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// We force a direct iteration (using the array length, not the iterator
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// protocol). The mapper function gets called during this iteration, not in a
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// separate one. Hence when index 1 is read, 2 is retrieved from the prototype
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// and incremented to 3.
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Array.prototype[Symbol.iterator] = undefined;
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assertArrayEquals([2, 3, 4], Uint16Array.from(arr, mapper));
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