The delete()
method of WeakMap
instances removes the specified element from this WeakMap
.
The delete()
method of WeakMap
instances removes the specified element from this WeakMap
.
weakMapInstance.delete(key)
key
The key of the element to remove from the WeakMap
object.
true
if an element in the WeakMap
object has been removed successfully. false
if the key is not found in the WeakMap
. Always returns false
if key
is not an object or a non-registered symbol.
const 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.
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
delete |
36 | 12 | 6Before Firefox 38, this method threw aTypeError 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 | 36 | 6Before Firefox 38, this method threw aTypeError 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. |
24 | 8 | 3.0 | 37 | 1.0 | 0.12.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/delete