mirror of https://github.com/tc39/test262.git
51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
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// Copyright (C) 2023 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-array.fromasync
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description: >
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Overwrites non-writable element properties on an instance of a custom
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this-value
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info: |
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3.j.ii.8. Let _defineStatus_ be CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
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...
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3.k.vii.6. Perform ? CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
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includes: [asyncHelpers.js]
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flags: [async]
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features: [Array.fromAsync]
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---*/
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asyncTest(async function () {
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function MyArray() {
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this.length = 4;
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for (let ix = 0; ix < this.length; ix++) {
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Object.defineProperty(this, ix, {
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enumerable: true,
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writable: false,
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configurable: true,
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value: 99
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});
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}
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}
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let result = await Array.fromAsync.call(MyArray, [0, 1, 2]);
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assert.sameValue(result.length, 3, "Length property is overwritten");
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assert.sameValue(result[0], 0, "Read-only element 0 is overwritten");
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assert.sameValue(result[1], 1, "Read-only element 1 is overwritten");
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assert.sameValue(result[2], 2, "Read-only element 2 is overwritten");
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assert.sameValue(result[3], 99, "Element 3 is not overwritten");
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result = await Array.fromAsync.call(MyArray, {
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length: 3,
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0: 0,
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1: 1,
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2: 2,
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3: 3 // ignored
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});
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assert.sameValue(result.length, 3, "Length property is overwritten");
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assert.sameValue(result[0], 0, "Read-only element 0 is overwritten");
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assert.sameValue(result[1], 1, "Read-only element 1 is overwritten");
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assert.sameValue(result[2], 2, "Read-only element 2 is overwritten");
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assert.sameValue(result[3], 99, "Element 3 is not overwritten");
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});
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