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
45
46
47
|
// Copyright (C) 2013 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 19.1.2.4
description: >
Symbol used as property for property definition
flags: [noStrict]
features: [Symbol]
---*/
var sym = Symbol();
var obj = {};
Object.defineProperty(obj, sym, {
value: 1,
});
assert.sameValue(sym in obj, true, "The result of `sym in obj` is `true`");
assert.sameValue(
Object.hasOwnProperty.call(obj, sym),
true,
"`Object.hasOwnProperty.call(obj, sym)` returns `true`"
);
var desc = Object.getOwnPropertyDescriptor(obj, sym);
assert.sameValue(desc.value, 1, "The value of `desc.value` is `1`");
assert.sameValue(desc.configurable, false, "The value of `desc.configurable` is `false`");
assert.sameValue(desc.writable, false, "The value of `desc.writable` is `false`");
assert.sameValue(desc.enumerable, false, "The value of `desc.enumerable` is `false`");
assert.sameValue(
Object.prototype.propertyIsEnumerable.call(obj, sym),
false,
"`Object.prototype.propertyIsEnumerable.call(obj, sym)` returns `false`"
);
assert.sameValue(delete obj[sym], false, "The result of `delete obj[sym]` is `false`");
assert.notSameValue(
Object.getOwnPropertyDescriptor(obj, sym),
undefined,
"`Object.getOwnPropertyDescriptor(obj, sym)` does not return `undefined`"
);
obj[sym] = 2;
assert.sameValue(obj[sym], 1, "The value of `obj[sym]` is `1`");
|
