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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enums and Objects

Posted by williamho3
williamho3
9,799 Points

I'm not getting any error's but i dont understand why my code is wrong (enums and objects) 

class Point {
    var x: Int
    var y: Int

    init(x: Int, y: Int){
        self.x = x
        self.y = y
    }
}

enum Direction {
    case Left 
    case Right
    case Up
    case Down
}

class Robot {
    var location: Point   
    init() {
        self.location = Point(x: 0, y: 0)
    }    
    func move(direction: Direction) {
switch direction{
        case .Up: return location.y += 1
        case .Down: return location.y -= 1
        case .Right: return location.x += 1
        case .Left: return location.x -= 1
        }
}

4 Answers

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi William,

You don't want to return the increment; just increment the location. I prefer ++ and -- but you can use += like you have:

    func move(direction: Direction) {
        // Enter your code below
        switch direction{
          case .Up:  location.y++
          case .Down:  location.y--
          case .Right:  location.x++
          case .Left:  location.x--
        }
    }

I hope that helps.

Steve.

Steve Hunter
Steve Hunter
57,712 Points

P.S. You solved another problem - I've just replied to Mitchell Warmerdam in this post where we had been talking about two different challenges! Oops! Still, the solution was correct.

williamho3
williamho3
9,799 Points
williamho3
williamho3
9,799 Points

Thanks Steve. I tried that and it still is returning an error. I have even copied at pasted exactly your code here and it is still not working. It just says

swift_lint.swift:37:1: error: expected declaration

^

I dont understand what the problem is?

Steve Hunter
Steve Hunter
57,712 Points

Give me a minute ...

Steve Hunter
Steve Hunter
57,712 Points

Odd ... works for me ... did you paste to the right place? When I pasted it, I did it wrong first time; that's why I ask.

If I copy my whole func over that in the challenge, it passes.

williamho3
williamho3
9,799 Points
williamho3
williamho3
9,799 Points

very odd. Yes i have pasted over the whole func and it is still returning the error. Thank you so much for your help i dont know what i can possibly be doing wrong!

williamho3
williamho3
9,799 Points
williamho3
williamho3
9,799 Points

i fixed it! Missed the last } of the end Thank you so much for your help !

Steve Hunter
Steve Hunter
57,712 Points

Well done! :-)