Map implementation with per-record TTL support

TTLCacheMap.js

class TTLMap {
  constructor(TTL) {
    this.ttl = TTL;
    this.timeoutData = {};
    this.data = new Map();
  }

  _clearTimeout(key) {
    clearTimeout(this.timeoutData[key]);
    delete this.timeoutData[key];
  }

  get(key) {
    return this.data.get(key);
  }

  set(key, val) {
    this.clearTimeout(key);
    this.data.set(key, val);
    this.timeoutData[key] = setTimeout(() => {
      this._clearTimeout(key);
      this.data.delete(key);
      this.delete(key);
    }, this.ttl)
    return this;
  }

  delete(key) {
    this.clearTimeout(key);
    if (this.data.has(key)) {
      this.data.delete(key);
      return true;
    }
    this.data.delete(key);
    return false;
  }

  clear() {
    this.data = {};
    Object.values(this.timeoutData).forEach(t => clearTimeout(t));
    this.timeoutData = {};
  }
}