The has() method returns a boolean indicating whether an object exists in a WeakSet or not.
WeakSet.prototype.has()
Try it
Syntax
has(value)
Parameters
-
value -
Required. The object to test for presence in the
WeakSet.
Return value
- Boolean
-
Returns
trueif an element with the specified value exists in theWeakSetobject; otherwisefalse.
Examples
Using the has method
var ws = new WeakSet(); var obj = {}; ws.add(window); mySet.has(window); // returns true mySet.has(obj); // returns false
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 | |
has |
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/has
