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export class MapPolyfill {
  public size = 0;
  private _values: any[] = [];
  private _keys: any[] = [];

  get(key: any) {
    const i = this._keys.indexOf(key);
    return i === -1 ? undefined : this._values[i];
  }

  set(key: any, value: any) {
    const i = this._keys.indexOf(key);
    if (i === -1) {
      this._keys.push(key);
      this._values.push(value);
      this.size++;
    } else {
      this._values[i] = value;
    }
    return this;
  }

  delete(key: any): boolean {
    const i = this._keys.indexOf(key);
    if (i === -1) { return false; }
    this._values.splice(i, 1);
    this._keys.splice(i, 1);
    this.size--;
    return true;
  }

  clear(): void {
    this._keys.length = 0;
    this._values.length = 0;
    this.size = 0;
  }

  forEach(cb: Function, thisArg: any): void {
    for (let i = 0; i < this.size; i++) {
      cb.call(thisArg, this._values[i], this._keys[i]);
    }
  }
}