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

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

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

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