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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.concat
description: >
An undefined value for the @@species constructor triggers the creation of
an Array exotic object
info: |
[...]
9. Let A be ? ArraySpeciesCreate(O, actualDeleteCount).
[...]
9.4.2.3 ArraySpeciesCreate
[...]
5. Let C be ? Get(originalArray, "constructor").
[...]
7. If Type(C) is Object, then
a. Let C be ? Get(C, @@species).
b. If C is null, let C be undefined.
8. If C is undefined, return ? ArrayCreate(length).
features: [Symbol.species]
---*/
var a = [];
var result;
a.constructor = {};
a.constructor[Symbol.species] = undefined;
result = a.concat();
assert.sameValue(
Object.getPrototypeOf(result),
Array.prototype,
'Object.getPrototypeOf(a.concat()) returns Array.prototype'
);
assert(Array.isArray(result), 'Array.isArray(result) must return true');
reportCompare(0, 0);
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