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 theWeakSet
object; 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
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'WeakSet.prototype.has' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'WeakSet.prototype.has' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 36 | Yes | 34 | No | 23 | 9 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 36 | 36 | Yes | 34 | No | 23 | 9 |