Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

class Animal {
    var name: String
    var sound: String

init(name: String, sound: String) {
        self.name = name
        self.sound = sound
    }

func makeSound() -> String {
        return "\(name) says \(sound)"
    }

func describe() -> String {
        return "Animal: \(name)"
    }
}

class Dog: Animal {
    var breed: String

init(name: String, breed: String) {
        self.breed = breed
        super.init(name: name, sound: "Woof")
    }

// Override method
    override func describe() -> String {
        return "\(super.describe()), Breed: \(breed)"
    }

// New method
    func fetch() -> String { "\(name) fetches the ball!" }
}

class GoldenRetriever: Dog {
    init(name: String) {
        super.init(name: name, breed: "Golden Retriever")
    }

override func makeSound() -> String {
        return "\(name) barks happily!"
    }
}

let dog = GoldenRetriever(name: "Buddy")
print(dog.makeSound())    // Buddy barks happily!
print(dog.describe())     // Animal: Buddy, Breed: Golden Retriever
print(dog is Animal)      // true - type checking