WeakMap.prototype.get()

The get() method of WeakMap instances returns a specified element from this WeakMap.

Try it

Syntax

js

get(key)

Parameters

key

The key of the element to return from the WeakMap object.

Return value

The element associated with the specified key in the WeakMap object. If the key can't be found, undefined is returned. Always returns undefined if key is not an object or a non-registered symbol.

Examples

Using the get() method

js

const wm = new WeakMap();
wm.set(window, "foo");

wm.get(window); // Returns "foo".
wm.get("baz"); // Returns undefined.

Specifications

Specification
ECMAScript Language Specification
# sec-weakmap.prototype.get

Browser compatibility

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See also