WeakMap.prototype.delete()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since July 2015.

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The delete() method of WeakMap instances removes the entry specified by the key from this WeakMap.

Try it

const weakmap = new WeakMap();
const object = {};

weakmap.set(object, 42);

console.log(weakmap.delete(object));
// Expected output: true

console.log(weakmap.has(object));
// Expected output: false

Syntax

weakMapInstance.delete(key)

Parameters

key: The key of the entry to remove from the WeakMap object. Object keys are compared by reference, not by value.

true if an entry 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.

Examples

Using delete()

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.