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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: >
TypeError is thrown if CreateDataProperty fails.
(result object is non-extensible, source array is not 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
[...]
vi. Else,
[...]
2. Perform ? CreateDataPropertyOrThrow(target, ! ToString(targetIndex), element).
[...]
CreateDataPropertyOrThrow ( O, P, V )
[...]
3. Let success be ? CreateDataProperty(O, P, V).
4. If success is false, throw a TypeError exception.
features: [Symbol.species]
---*/
var A = function(_length) {
this.length = 0;
Object.preventExtensions(this);
};
var arr = [1];
arr.constructor = {};
arr.constructor[Symbol.species] = A;
assert.throws(TypeError, function() {
arr.flat(1);
});
reportCompare(0, 0);
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