Cache With Time Limit

export class TimeLimitedCache {
  private readonly cache: Map<number, { timeoutId: number; value: number }>;
 
  constructor() {
    this.cache = new Map();
  }
 
  private _set(key: number, value: number, duration: number): void {
    const timeoutId = setTimeout(() => {
      this.cache.delete(key);
    }, duration);
    this.cache.set(key, { value, timeoutId: +timeoutId });
  }
 
  public set(key: number, value: number, duration: number): boolean {
    const cached = this.cache.get(key);
    if (cached) {
      clearTimeout(cached.timeoutId);
      this._set(key, value, duration);
      return true;
    }
    this._set(key, value, duration);
    return false;
  }
 
  public get(key: number): number {
    const cached = this.cache.get(key);
    if (cached) {
      return cached.value;
    }
    return -1;
  }
 
  public count(): number {
    return this.cache.size;
  }
}