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Showing content from https://developer.cdn.mozilla.net/ko/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/get below:

WeakMap.prototype.get() - JavaScript | MDN

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get() 메서드는 WeakMap 객체에서 특정 요소를 반환합니다.

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

필수로 요구되며,WeakMap 객체에서 반환할 요소의 키입니다.

WeakMap 객체의 특정 키와 연결된 요소입니다. 키를 찾을 수 없으면 undefined가 반환됩니다.

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

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

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