System Design Quiz Practice

class LRUCache {
  constructor(cap) { this.capacity = cap; this.cache = new Map(); }
  get(key) {
    if (!this.cache.has(key)) return undefined;
    const v = this.cache.get(key);
    this.cache.delete(key); this.cache.set(key, v);
    return v;
  }
  set(key, value) {
    if (this.cache.has(key)) this.cache.delete(key);
    else if (this.cache.size >= this.capacity) {
      this.cache.delete(this.cache.keys().next().value);
    }
    this.cache.set(key, value);
  }
}
const c = new LRUCache(2);
c.set("a", 1);
c.set("b", 2);
c.get("a");
c.set("c", 3);
console.log(c.get("b"), c.get("a"), c.get("c"));