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47 lines
1.0 KiB
JavaScript
47 lines
1.0 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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esid: sec-array.from
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description: >
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Non-writable properties are overwritten by CreateDataProperty.
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(result object's "0" is non-writable, items is not iterable)
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info: |
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Array.from ( items [ , mapfn [ , thisArg ] ] )
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[...]
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4. Let usingIterator be ? GetMethod(items, @@iterator).
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5. If usingIterator is not undefined, then
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[...]
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6. NOTE: items is not an Iterable so assume it is an array-like object.
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[...]
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12. Repeat, while k < len
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[...]
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e. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue).
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[...]
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includes: [propertyHelper.js]
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---*/
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var items = {
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"0": 2,
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length: 1,
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};
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var A = function(_length) {
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Object.defineProperty(this, "0", {
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value: 1,
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writable: false,
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enumerable: false,
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configurable: true,
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});
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};
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var res = Array.from.call(A, items);
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verifyProperty(res, "0", {
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value: 2,
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writable: true,
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enumerable: true,
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configurable: true,
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});
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