blob: 0c64e020177a92966ae5606c5fba0ad8e7d91364 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// 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);
|