ex18 - https://medium.com/@lu4nm3/bend-any-type-to-your-will-with-ad-hoc-polymorphism-4e6d326f1ff0

ex18_bend.scala

object OutsourcedPerishables {
  implicit val iceCreamPerishable: Perishable[IceCream] = new Perishable[IceCream] {
    def expired(i: IceCream): Boolean = true // in reality you would actually calculate the expiration for ice cream
  }
}