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

John Wilcox
John Wilcox
4,233 Points

+= operator instead?


Within the body of the switch statement, instead of location.y = location.y + 1, couldn't I have said location.y += 1? I tried but it wouldn't compile :-(

PS - LOVE the courses!

2 Answers

David Papandrew
David Papandrew
8,386 Points

Can you share the code that is failing?

I was able to pass with this:

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: self.location.x -= 1
        case .right: self.location.x += 1
        case .up: self.location.y += 1
        case .down: self.location.y -= 1
John Wilcox
John Wilcox
4,233 Points

Hi, I did the same thing as you, but didn't say 'self.location.x -= 1'.

I just said case .left: location.x -= 1.

I'm not sure what I ultimately ended up typing. The compiler did eventually accept my answer.

I'll just watch for it in the future. Thank you David for responding :-)