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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.