14032019_3

import Foundation

protocol NoiseMaker{
    func makeNoise()->String
}

class Dog: NoiseMaker{
    func makeNoise()->String {
        return "bark"
    }
}

class Phone: NoiseMaker{
    func makeNoise()->String {
        return "ring"
    }
}

let noiseMakers:[NoiseMaker] = [Dog(), Phone(),Dog(),Dog(),Phone()]
for noiseMakers in noiseMakers{
    print(noiseMakers.makeNoise())
}