LID 5

index.ts

class Rectangle {
  protected _width: number = -1;
  protected _height: number = -1;

  public get width() {
    return this._width;
  }
  public set width(w: number) {
    this._width = w;
  }

  public get height() {
    return this._height;
  }
  public set height(h: number) {
    this._height = h;
  }

  public get area() {
    return this._width * this._height;
  }
}

class Square extends Rectangle {
  public set width(w: number) {
    this._width = w;
    this._height = w;
  }

  public set height(h: number) {
    this._width = h;
    this._height = h;
  }
}