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The delete() method removes the specified element from a WeakSet object.




Required. The object remove from the WeakSet object.

Return value

true if an element in the WeakMap object has been removed successfully. false if the key is not found in the WeakMap or if the key is not an object.


Using the delete method

var ws = new WeakSet();
var obj = {};


ws.delete(obj);    // Returns false. No obj found to be deleted.
ws.delete(window); // Returns true.  Successfully removed.

ws.has(window);    // Returns false. The window is no longer present in the WeakSet.


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'WeakSet.prototype.delete' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'WeakSet.prototype.delete' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support36 Yes34 No239
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support3636 Yes34239 ?

See also

Document Tags and Contributors

 Last updated by: wbamberg,