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

When you tell the robot to move up (by specifying Direction.Up as the argument), the y coordinate should increase by 1.

need a little help with this

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 Direction.Up: location.y += 1
        case Direction.Down: location.y -= 1
        case Direction.Left: location.x -= 1
        case Direction.Right: location.x += 1



        }
}

2 Answers

Jeff McDivitt
Jeff McDivitt
23,970 Points

Capitalization not needed on enum cases; they must match enum declaration

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) {
        switch direction {
        case .up:
            location.y += 1
        case .down:
            location.y -= 1
        case .right:
            location.x += 1
        case .left:
            location.x -= 1

        }
    }
}

Your enum cases are capitalized, but they are lowercase in the enum description. Fix that and you should be good.