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) Copyright 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 12.9.4
description: >
Type coercion of value returned by constructor's @@hasInstance property
info: >
1. If Type(C) is not Object, throw a TypeError exception.
2. Let instOfHandler be GetMethod(C,@@hasInstance).
3. ReturnIfAbrupt(instOfHandler).
4. If instOfHandler is not undefined, then
a. Return ToBoolean(Call(instOfHandler, C, «O»)).
features: [Symbol, Symbol.hasInstance]
---*/
var F = {};
F[Symbol.hasInstance] = function() { return undefined; };
assert.sameValue(0 instanceof F, false);
F[Symbol.hasInstance] = function() { return null; };
assert.sameValue(0 instanceof F, false);
F[Symbol.hasInstance] = function() { return true; };
assert.sameValue(0 instanceof F, true);
F[Symbol.hasInstance] = function() { return NaN; };
assert.sameValue(0 instanceof F, false);
F[Symbol.hasInstance] = function() { return 1; };
assert.sameValue(0 instanceof F, true);
F[Symbol.hasInstance] = function() { return ''; };
assert.sameValue(0 instanceof F, false);
F[Symbol.hasInstance] = function() { return 'string'; };
assert.sameValue(0 instanceof F, true);
F[Symbol.hasInstance] = function() { return Symbol(); };
assert.sameValue(0 instanceof F, true);
F[Symbol.hasInstance] = function() { return {}; };
assert.sameValue(0 instanceof F, true);
|
