تخزين مفاتيح وقيم بإستخدام Map

const scores = new Map();
scores.set("Osama", 90);
console.log(scores.get("Osama"));
console.log(scores.size);

90
1

const user = { id: 1 };
const visits = new Map([[user, 3]]);
console.log(visits.get(user));
console.log(visits.get({ id: 1 }));

3
undefined