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// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.flat
description: >
Non-writable properties are overwritten by CreateDataProperty.
(result object's "0" is non-writable, source array gets flattened)
info: |
Array.prototype.flat ( [ depth ] )
[...]
6. Perform ? FlattenIntoArray(A, O, sourceLen, 0, depthNum).
FlattenIntoArray ( target, source, sourceLen, start, depth [ , mapperFunction, thisArg ] )
[...]
9. Repeat, while sourceIndex < sourceLen
[...]
c. If exists is true, then
[...]
v. If shouldFlatten is true, then
[...]
2. Set targetIndex to ? FlattenIntoArray(target, element, elementLen, targetIndex, depth - 1).
[...]
features: [Symbol.species]
includes: [propertyHelper.js]
---*/
var A = function(_length) {
Object.defineProperty(this, "0", {
value: 1,
writable: false,
enumerable: false,
configurable: true,
});
};
var arr = [[2]];
arr.constructor = {};
arr.constructor[Symbol.species] = A;
var res = arr.flat(1);
verifyProperty(res, "0", {
value: 2,
writable: true,
enumerable: true,
configurable: true,
});
reportCompare(0, 0);
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