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

Posted by Corey Hellwege
Corey Hellwege
3,863 Points

In the editor below you have two objects - classes named Point and Robot. The Robot stores its location as a point insta

Hi, not sure how to finish this off correctly.

classes.swift 
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) {
        // Enter your code below
        switch direction {
        case .Left: Point(x: -1, y: 0)
        case .Right: Point(x: +1, y: 0)
        case .Up: Point(x: 0, y: +1)
        case.Down: Point(x: 0, y: -1)
        } 
    }
}

let direction = move(Direction)

2 Answers

jcorum
jcorum
71,830 Points

You can get to the x and y variables for location using dot notation. 

    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--
        }
    }
Corey Hellwege
Corey Hellwege
3,863 Points

Got it. Thank you!

Ayso Lima Marques
Ayso Lima Marques
5,122 Points
Ayso Lima Marques
Ayso Lima Marques
5,122 Points

just in case some more recent student come here to check this out, in swift 3.0, you should proceed that way

func move(direction: Direction) {
        // Enter your code below
        switch direction {
        case .Up:
            return location.y += 1
        case .Down:
            return location.y -= 1
        case .Right:
            return location.x += 1
        default:
            return location.x -= 1
        }
    }
Jacob Smith
Jacob Smith
10,926 Points
Jacob Smith
Jacob Smith
10,926 Points

When referencing a return type of ( -> Int ) this programming did not work for me. jcorum 's programming seemed to satisfy the code challenge. Happy Coding.