WeakSet() constructor
The WeakSet
constructor lets you create WeakSet
objects that store weakly held objects in a collection.
Syntax
new WeakSet() new WeakSet(iterable)
Parameters
- iterable
-
If an iterable object is passed, all of its elements will be added to the new
WeakSet
. null is treated as undefined.
Examples
Using the WeakSet object
var ws = new WeakSet(); var foo = {}; var bar = {}; ws.add(foo); ws.add(bar); ws.has(foo); // true ws.has(bar); // true ws.delete(foo); // removes foo from the set ws.has(foo); // false, foo has been removed ws.has(bar); // true, bar is retained
Note that foo !== bar
. While they are similar objects, they are not the same object. And so they are both added to the set.
Specifications
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
WeakSet |
36 |
12 |
34 |
No |
23 |
9 |
37 |
36 |
34 |
24 |
9 |
3.0 |
iterable_allowed |
38 |
12 |
34 |
No |
25 |
9 |
38 |
38 |
34 |
25 |
9 |
3.0 |
null_allowed |
36 |
12 |
37 |
No |
23 |
9 |
37 |
36 |
37 |
24 |
9 |
3.0 |
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet/WeakSet