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452c0e5c61
* Automated assertion message update: Array.from * Automated assertion message update: Array.isArray * Automated assertion message update: Array length property * Automated assertion message update: Array.of * Automated assertion message update: Array * Automated assertion message update: Array.prototype.at * Automated assertion message update: Array.prototype.concat * Automated assertion message update: compareArray -> assert.compareArray
47 lines
1.4 KiB
JavaScript
47 lines
1.4 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 current descriptor's [[Writable]] check.
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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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12. If oldLenDesc.[[Writable]] is false, return false.
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features: [Symbol, Symbol.toPrimitive, Reflect, Reflect.set]
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includes: [compareArray.js]
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---*/
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var array = [1, 2, 3];
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var hints = [];
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var length = {};
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length[Symbol.toPrimitive] = function(hint) {
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hints.push(hint);
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Object.defineProperty(array, "length", {writable: false});
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return 0;
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};
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assert.throws(TypeError, function() {
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"use strict";
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array.length = length;
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}, '`"use strict"; array.length = length` throws a TypeError exception');
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assert.compareArray(hints, ["number", "number"], 'The value of hints is expected to be ["number", "number"]');
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array = [1, 2, 3];
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hints = [];
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assert(
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!Reflect.set(array, "length", length),
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'The value of !Reflect.set(array, "length", length) is expected to be true'
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);
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assert.compareArray(hints, ["number", "number"], 'The value of hints is expected to be ["number", "number"]');
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