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

Praneeth Raghav
Praneeth Raghav
1,149 Points

It is not compiling!!

Can anyone tell me whats wrong with my code??

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

1 Answer

Thomas Dobson
Thomas Dobson
7,511 Points

Hi Praneeth,

your actually spot on minus one thing. You want to switch on your internal variable (from func move) direction which is of TYPE Direction. You tried to switch on the enum itself.

Here is the code:

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 { //Changed to direction
        case .up: location.y += 1
        case .down: location.y -= 1
        case .right: location.x += 1
        case .left: location.x -= 1
        }
    }
}
Praneeth Raghav
Praneeth Raghav
1,149 Points

Thank you sir, I am grateful!!!