Programming in Swift: Functions & Types

Jan 4 2022 · Swift 5.5, iOS 15, Xcode 13

Part 5: Protocols & Inheritance

39. Challenge: Inheritance

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Notes: 39. Challenge: Inheritance

Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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I’ve got an inheritance challenge for you! Again, everything you need is in the playground for this part of the course. Pause the video, and do your best to work through the exercises. Then, come back to see how I did things. Have fun!

class Animal {
  func speak() { }
class WildAnimal: Animal {
  let isPoisonous: Bool
  init(isPoisonous: Bool) {
    self.isPoisonous = isPoisonous
class Pet: Animal {
  let name: String
  init(name: String) { = name
  func play() {
    print("Playtime! ... now naptime 💤")
  override func speak() {
    print("Hi I'm \(name)! I am cute. Pet me!")
class Cat: Pet {
  override func speak() {
    print("I can has Cheezeburger?")
let animal = Animal()
let babyAragog = WildAnimal(isPoisonous: true)
let babySmaug = WildAnimal(isPoisonous: false)
let hamtaro = Pet(name: "Hamtaro")
let ozma = Cat(name: "Ozma")
let animals = [animal, babyAragog, babySmaug, hamtaro, ozma]
func printElevatorPitch(forAnimal animal: Animal) {

  if let animal = animal as? WildAnimal {
    print(animal.isPoisonous ? "It's only a little poisonous!" : "It's not even poisonous!")
  if let pet = animal as? Pet {
    switch pet {
    case let cat as Cat:
      print("It's a kitty named \(! I've always wanted a kitty.")
      print("This is definitely a normal sort of pet and I've named them \(")
  print("It's Animal! You know, the Muppet?")