The add()
method appends a new object to the end of a WeakSet
object.
WeakSet.prototype.add()
Try it
Syntax
add(value)
Parameters
- value
-
Required. The object to add to the
WeakSet
collection.
Return value
The WeakSet
object.
Examples
Using add
var ws = new WeakSet(); ws.add(window); // add the window object to the WeakSet ws.has(window); // true // WeakSet only takes objects as arguments ws.add(1); // results in "TypeError: Invalid value used in weak set" in Chrome // and "TypeError: 1 is not a non-null object" in Firefox
Specifications
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
add |
36
|
12
|
34
|
No
|
23
|
9
|
37
|
36
|
34
|
24
|
9
|
3.0
|
1.0
|
0.12.0
|
See also
© 2005–2022 MDN contributors.
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/add