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weakMap.delete

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

Syntax

wm.delete(key);

Parameters

key: Required. The key of the element to remove from the WeakMap 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.

Examples

Using the `delete` method

var wm = new WeakMap();
wm.set(window, 'foo');

wm.delete(window); // Returns true. Successfully removed.

wm.has(window);    // Returns false. The window object is no longer in the WeakMap.

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	36	Yes	6 6 Prior to Firefox 38, this method threw a `TypeError` when the key parameter was not an object. This has been fixed in version 38 and later to return `false` as per the ES2015 standard.	11	23	8

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	37	36	Yes	6 6 Prior to Firefox 38, this method threw a `TypeError` when the key parameter was not an object. This has been fixed in version 38 and later to return `false` as per the ES2015 standard.	23	8	Yes

	Server
	Node.js
Basic support	0.12 0.12 0.10 Disabled Disabled From version 0.10: this feature is behind the `--harmony` runtime flag.