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c5ff019a4e
PR-URL: https://github.com/nodejs/node/pull/37330 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
// Copyright 2020 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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// Flags: --harmony-relative-indexing-methods --allow-natives-syntax
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'use strict';
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[
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[1, 2, 3],
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'123',
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new Uint8Array([1, 2, 3]),
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].forEach((v) => {
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assertEquals(v.at(0), v[0]);
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assertEquals(v.at(-1), v[2]);
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assertEquals(v.at(-4), undefined);
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assertEquals(v.at(3), undefined);
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assertEquals(v.at(1337), undefined);
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assertEquals(v.at(-Infinity), undefined);
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assertEquals(v.at(Infinity), undefined);
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assertEquals(v.at(NaN), v[0]);
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assertEquals(v.at(undefined), v[0])
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assertEquals(v.at(), v[0]);
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});
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{
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const props = ['length', '2'];
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const proxy = new Proxy([1, 2, 3], {
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get(t, p, r) {
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assertEquals(p, props.shift());
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return Reflect.get(t, p, r);
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}
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});
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assertEquals(Array.prototype.at.call(proxy, -1), 3);
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}
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assertThrows(() => {
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Uint8Array.prototype.at.call({});
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}, TypeError);
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{
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const a = new Uint8Array([1, 2, 3]);
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%ArrayBufferDetach(a.buffer);
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assertThrows(() => {
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a.at(0);
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}, TypeError);
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}
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assertEquals(Array.prototype[Symbol.unscopables].at, true);
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