export class HashMap<K, V, Hash = unknown> {
  private map = new Map<Hash, V>()

  get [Symbol.toStringTag](): string {
    return this.constructor.name
  }

  get size(): number {
    return this.map.size
  }

  constructor(private hash: (key: K) => Hash) {}

  set(key: K, value: V): this {
    this.map.set(this.hash(key), value)
    return this
  }

  has(key: K): boolean {
    return this.map.has(this.hash(key))
  }

  get(key: K): V | undefined {
    return this.map.get(this.hash(key))
  }

  delete(key: K): boolean {
    return this.map.delete(this.hash(key))
  }

  clear(): void {
    this.map.clear()
  }

  values(): IterableIterator<V> {
    return this.map.values()
  }
}