In support to blog post https://codewithshabib.com/2017/02/05/introduction-to-strategy-pattern/

SmartVehicle.swift

protocol RoadDrivable {
    func driveOnRoad()
}

protocol WaterDrivable {
    func driveOnWater()
}

protocol Flyable {
    func flyOnAir()
}

class SmartVehicle {
	func talk() {
		print("Hi! I am the smart talking vehicle!")
	}
}

class SmartCar: SmartVehicle, RoadDrivable {
	func driveOnRoad() {
		print("Vroom!")
	}
}

class SmartBoat: SmartVehicle, WaterDrivable {
    func driveOnWater() {
		print("I can run over water, because I can! B-)")
	}
}

class SmartPlane: SmartVehicle, Flyable {
    func flyOnAir() {
        print("Wohoo! I am flying high!")
    }
}