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

Posted by Kapil Soni
Kapil Soni
2,612 Points

why there is error?

code work fine in playground why error on teamtree swift

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) {
        // Enter your code below
        switch direction {
        case .left: return location.x -= 1
        case .right: return location.x += 1
        case .up: return location.y += 1
        case .down: return location.y -= 1
    }
}
var newRobot = Robot()
newRobot.move(.up)

1 Answer

Aniruddha Shukla
Aniruddha Shukla
2,846 Points

Your brackets are incorrect. You are missing a closing brace and end up trying to create an instance of the Robot in the Robot class itself. Please check again. This should work

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

var newRobot = Robot()
newRobot.move(.up)
Kapil Soni
Kapil Soni
2,612 Points

Thanks for pointing out. Sometime such silly thing happens :!