Method insert

Cache/LFUCache.js:40–48

* @method insert * @description - Add new CacheNode into HashSet by the frequency * @param {CacheNode} node

(node)

   * @param {CacheNode} node
   */
  insert(node) {
    const { frequency } = node

    if (!this.has(frequency)) {
      this.set(frequency, new Set())
    }

    this.get(frequency).add(node)
  }
}

class LFUCache {