Day 12, Checkpoint 7 of #100DaysOfSwiftUI ... nothing special here, I think ... ?!?

100DaysOfSwitfUI - Day 12 - Checkpoint 7.swift

class Animal {
    let legs = 4
}



class Dog: Animal {
    func speak() {
        print("bark")
    }
}



final class Corgi: Dog {
    override func speak() {
        print("woof")
    }
}



final class Poodle: Dog {
    override func speak() {
        print("bowbow")
    }
}



class Cat: Animal {
    let isTame: Bool
    
    init(isTame: Bool = true) {
        self.isTame = isTame
    }
    
    func speak() {
        print("meow")
    }
}



final class Persian: Cat {
    override func speak() {
        print("purr")
    }
}



final class Lion: Cat {
    
    init() {
        super.init(isTame: false)
    }
    
    override func speak() {
        print("roar")
    }
}



// Some best friends:
let dog = Dog()
let corgi: Corgi
corgi = Corgi()

dog.speak()
corgi.speak()
Poodle().speak()



// The cat is a Cat but that may be different cats:
var cat: Cat

cat = Cat()     ; print( "\(type(of: cat)) says:" ) ; cat.speak()
cat = Persian() ; print( "\(type(of: cat)) says:" ) ; cat.speak()
cat = Lion()    ; print( "\(type(of: cat)) says:" ) ; cat.speak()

// Once a Persian, always a Persian:
var moggie: Persian
moggie = Persian()
// moggie = Cat()  ⚡️
// moggie = Lion() ⚡️
print("Thank goodness our moggie has \(moggie.legs) legs.")