getter/setter

/* getter/setter */
class SpeedLimitedCar: Car {
    override var speed: Double  {
        get {
            return super.speed
        }
        set {
            super.speed = min(newValue, 40.0)
        }
    }
}
 
var limitCar = SpeedLimitedCar()
limitCar.speed = 35.0
print(limitCar.description())
limitCar.speed = 60.0
print(limitCar.description())