weakSet.has
The has()
method returns a boolean indicating whether an object exists in a WeakSet
or not.
Syntax
ws.has(value);
Parameters
value
- Required. The object to test for presence in the
WeakSet
.
Return value
- Boolean
- Returns
true
if an element with the specified value exists in the WeakSet
object; otherwise false
.
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
|
Desktop |
|
Chrome |
Edge |
Firefox |
Internet Explorer |
Opera |
Safari |
has |
36 |
12 |
34 |
No |
23 |
9 |
|
Mobile |
|
Android webview |
Chrome for Android |
Firefox for Android |
Opera for Android |
Safari on iOS |
Samsung Internet |
has |
37 |
36 |
34 |
24 |
9 |
3.0 |
See also