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Viewing file:     lrucache.js (788 B)      -rw-r--r--

class LRUCache {
  constructor () {
    this.max = 1000
    this.map = new Map()
  }

  get (key) {
    const value = this.map.get(key)
    if (value === undefined) {
      return undefined
    } else {
      // Remove the key from the map and add it to the end
      this.map.delete(key)
      this.map.set(key, value)
      return value
    }
  }

  delete (key) {
    return this.map.delete(key)
  }

  set (key, value) {
    const deleted = this.delete(key)

    if (!deleted && value !== undefined) {
      // If cache is full, delete the least recently used item
      if (this.map.size >= this.max) {
        const firstKey = this.map.keys().next().value
        this.delete(firstKey)
      }

      this.map.set(key, value)
    }

    return this
  }
}

module.exports = LRUCache