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
41
42
43
44
|
// Copyright (C) 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
String values of `Symbol.toStringTag` property override built-in tags
es6id: 19.1.3.6
info: |
1. If the this value is undefined, return "[object Undefined]".
2. If the this value is null, return "[object Null]".
14. Else, let builtinTag be "Object".
15. Let tag be ? Get(O, @@toStringTag).
16. If Type(tag) is not String, let tag be builtinTag.
17. Return the String that is the result of concatenating "[object ", tag, and "]".
4.3.2 primitive value
member of one of the types Undefined, Null, Boolean, Number, Symbol, or String as defined in clause 6
features: [Symbol.toStringTag]
---*/
Boolean.prototype[Symbol.toStringTag] = 'test262';
assert.sameValue(Object.prototype.toString.call(Boolean.prototype), '[object test262]');
assert.sameValue(Object.prototype.toString.call(true), '[object test262]');
Number.prototype[Symbol.toStringTag] = 'test262';
assert.sameValue(Object.prototype.toString.call(Number.prototype), '[object test262]');
assert.sameValue(Object.prototype.toString.call(0), '[object test262]');
String.prototype[Symbol.toStringTag] = 'test262';
assert.sameValue(Object.prototype.toString.call(String.prototype), '[object test262]');
assert.sameValue(Object.prototype.toString.call(''), '[object test262]');
Object.defineProperty(Symbol.prototype, Symbol.toStringTag, {
value: 'test262'
});
assert.sameValue(Object.prototype.toString.call(Symbol.prototype), '[object test262]');
reportCompare(0, 0);
|
