mirror of https://github.com/tc39/test262.git
59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
// Copyright (C) 2020 Alexey Shvayka. 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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author: André Bargull
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esid: sec-arraysetlength
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description: >
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[[Value]] is coerced to number before descriptor validation.
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info: |
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ArraySetLength ( A, Desc )
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[...]
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3. Let newLen be ? ToUint32(Desc.[[Value]]).
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4. Let numberLen be ? ToNumber(Desc.[[Value]]).
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[...]
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7. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length").
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[...]
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11. If newLen ≥ oldLen, then
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a. Return OrdinaryDefineOwnProperty(A, "length", newLenDesc).
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OrdinaryDefineOwnProperty ( O, P, Desc )
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[...]
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3. Return ValidateAndApplyPropertyDescriptor(O, P, extensible, Desc, current).
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ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )
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[...]
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7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true, then
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a. If current.[[Configurable]] is false and current.[[Writable]] is false, then
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i. If Desc.[[Writable]] is present and Desc.[[Writable]] is true, return false.
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features: [Reflect]
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---*/
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var array = [1, 2];
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var valueOfCalls = 0;
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var length = {
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valueOf: function() {
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valueOfCalls += 1;
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if (valueOfCalls !== 1) {
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// skip first coercion at step 3
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Object.defineProperty(array, "length", {writable: false});
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}
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return array.length;
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},
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};
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assert.throws(TypeError, function() {
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Object.defineProperty(array, "length", {value: length, writable: true});
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});
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assert.sameValue(valueOfCalls, 2);
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array = [1, 2];
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valueOfCalls = 0;
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assert(!Reflect.defineProperty(array, "length", {value: length, writable: true}));
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assert.sameValue(valueOfCalls, 2);
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