Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

Randell Purington
Randell Purington
9,992 Points

I am not too sure where I am getting it wrong.

I am not sure exactly how to write this out. I looked at other answers provided for the same code challenge but I think over the years things have changed so I am not finding anything to help.

Thank you!

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 .up: y += 1
        case .down: y -= 1
        case .right: x += 1
        case .left: x -= 1


1 Answer

Johnny Nguyen
Johnny Nguyen
3,875 Points
 switch direction {

        case .up: location.y += 1
        case .down: location.y -= 1
        case .right: location.x += 1
        case .left: location.x -= 1


As the challenge says, you should change the coordinates of the Robot's location. Because "y", "x" that you provide come out of nowhere.

Moreover, just look for solutions. There are not much of changes in swift 3 and 4.