PolymorphismNotLikeAsInPhp.scala

class Rectangle(width: Int, height: Int) {
  def getWidth: Int = width
  def getHeight: Int = height
}
class Square(side: Int) extends Rectangle(side, side) {
  def getSomething: Int = 1
}

def area(rectangle: Rectangle): Int = {
  rectangle.getHeight * rectangle.getWidth * rectangle.getSomething // it would't work!
}

val s = new Square(5)
println(area(s))