Baseline Widely available
The get() method of WeakMap instances returns a specified element from this WeakMap.
const weakmap1 = new WeakMap();
const object1 = {};
const object2 = {};
weakmap1.set(object1, 42);
console.log(weakmap1.get(object1));
// Expected output: 42
console.log(weakmap1.get(object2));
// Expected output: undefined
key
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. Always returns undefined if key is not an object or a non-registered symbol.
const wm = new WeakMap();
wm.set(window, "foo");
wm.get(window); // Returns "foo".
wm.get("baz"); // Returns undefined.
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