// Copyright (C) 2020 Alexey Shvayka. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-array.from description: > Non-writable properties are overwritten by CreateDataProperty. (result object's "0" is non-writable, items is not iterable) info: | Array.from ( items [ , mapfn [ , thisArg ] ] ) [...] 4. Let usingIterator be ? GetMethod(items, @@iterator). 5. If usingIterator is not undefined, then [...] 6. NOTE: items is not an Iterable so assume it is an array-like object. [...] 12. Repeat, while k < len [...] e. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue). [...] includes: [propertyHelper.js] ---*/ var items = { "0": 2, length: 1, }; var A = function(_length) { Object.defineProperty(this, "0", { value: 1, writable: false, enumerable: false, configurable: true, }); }; var res = Array.from.call(A, items); verifyProperty(res, "0", { value: 2, writable: true, enumerable: true, configurable: true, }); reportCompare(0, 0);