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switch statement

can someone give me some pointers on this one. here is the link and my current code:: https://teamtreehouse.com/library/build-a-simple-iphone-app-with-swift-20/getting-started-with-ios-development/swift-recap-part-2

class Machine {
    var location: Point

    init() {
        self.location = Point(x: 0, y: 0)

    func move(direction: String) {
        print("Do nothing! Im a machine!")

class Robot: Machine {

    override init(){

    override func move(direction: String){
        switch Point(x: 0, y: 0) {
        case func move(direction: "Up"):
        y += 1


1 Answer

Krzysztof Growinski
Krzysztof Growinski
8,405 Points

Hi, you don't need to override init method just the function. You can do it like this:

class Robot: Machine {

  override func move(direction: String) {
    switch direction {
      case "Up": location.y += 1
      case "Down": location.y -= 1
      case "Left": location.x -= 1
      case "Right": location.x += 1
      default: break

You have a default implementation of location variable defined in Machine class.