WeakMap.prototype.get()

The get() method returns a specified element from a WeakMap object.

wm.get(key);

key

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

The element associated with the specified key in the WeakMap object. If the key can't be found, undefined is returned.

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

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

• WeakMap
• WeakMap.set()
• WeakMap.has()