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

Posted by Mackenzy Douyon
.a{fill-rule:evenodd;}techdegree
Mackenzy Douyon
iOS Development Techdegree Student 2,913 Points

need help 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 .Up:
        return location.y += 1
    case .Down:
        return location.y -= 1
    case .Right:
        return location.x += 1
               case .Left:

        return location.x -= 1
    }

}

}

// posible solution #2 /* switch direction { case .Up: location.y++ case .Down: location.y-- case .Right: location.x++ case .Left: location.x-- } */

// posible solution #3

/* switch direction { case .Up: self.location.y += 1 case .Down: self.location.y -= 1 case .Left: self.location.x -= 1 case .Right: self.location.x += 1 } */

/* switch direction { case .Up: return location.y += 1 case .Down: return location.y -= 1 case .Right: return location.x += 1 default: return location.x -= 1 } */

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

            return location.x -= 1
        }

    }
}

// posible solution #2
/*
switch direction {
 case .Up:
 location.y++
 case .Down:
 location.y--
 case .Right:
 location.x++
 case .Left:
 location.x--
 }
*/  


// posible solution #3

/*
switch direction {
        case .Up:
            self.location.y += 1
        case .Down:
            self.location.y -= 1
        case .Left:
            self.location.x -= 1
        case .Right:
            self.location.x += 1
        }
*/

/*
switch direction {
        case .Up:
            return location.y += 1
        case .Down:
            return location.y -= 1
        case .Right:
            return location.x += 1
        default:
            return location.x -= 1
        }
        */

3 Answers

Carmen Ibarcena
.a{fill-rule:evenodd;}techdegree
Carmen Ibarcena
iOS Development Techdegree Student 8,296 Points

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

}

In this one I use a switch statement with each case

Mackenzy Douyon
seal-mask
.a{fill-rule:evenodd;}techdegree
Mackenzy Douyon
iOS Development Techdegree Student 2,913 Points
Mackenzy Douyon
.a{fill-rule:evenodd;}techdegree
Mackenzy Douyon
iOS Development Techdegree Student 2,913 Points

perfect, thanks.

Beatty Jamieson
Beatty Jamieson
3,660 Points
Beatty Jamieson
Beatty Jamieson
3,660 Points

Thank you. This was hanging me up too. Xcode wasn't rejecting my code, but treehouse kept giving me the error "make sure you are increasing y coordinate by 1", but didn't mention any other coordinates, which didn't make sense to me why it would only reject the one point if they all were written the same way.

switch direction {
        case .left: Point(x: -1, y: 0)
        case .right: Point(x: 1, y: 0)
        case .up: Point(x: 0, y: 1)
        case .down: Point(x: 0, y: -1)
        }