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

Gerald Darroles
Gerald Darroles
3,569 Points
Posted by Gerald Darroles
Gerald Darroles
3,569 Points

Enumerations code challenge

Hello!

Am I missing something in solving this? I believe I may need some help on how I retrieve properties in solving this code challenge. please help.

also, if you have additional readings, that will help a lot.

thank you

Gerald

test.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) {
        switch direction { 
              case Direction.up: location.y + 1 
          case Direction.down: location.y - 1
          case Direction.right: location.x + 1
          case Direction.left: location.x - 1
        }
    }
}

1 Answer

Magnus Hållberg
Magnus Hållberg
17,232 Points
Magnus Hållberg
Magnus Hållberg
17,232 Points

You have made a small mistake, you are supposed to update the existing locations value with + or - 1. As it is now you are just calculating it, not reading it back to location. So the switch needs to look like this:

switch direction { 
   case .up: location.y += 1 
   case .down: location.y -= 1
   case .right: location.x += 1
   case .left: location.x -= 1
}
Gerald Darroles
Gerald Darroles
3,569 Points
Gerald Darroles
Gerald Darroles
3,569 Points

Thank you so much Magnus. You are Great, i.e.Magnus.