types.kt

sealed class Pet
data class Dog(val name: String, val breed: String, val tricks: Array<String>) : Pet()
data class Cat(val name: String, val breed: String) : Pet()
data class Bird(val name: String, val breed: String, val words: Array<String>) : Pet()

fun playWithPet(pet: Pet):String{
  when(pet){
    is Dog -> println("You played with a DOG!")
    is Cat -> println("You played with a CAT!")
  }
  return "I am happy because I am playing with pets"
}