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Parvinder Grewal
3,678 PointsDirection Enumerated Switch
Hi,
I'm not sure where my error is. I have created a switch with a case for each direction enum , adding and subtracting accordingly.
What am I missing?
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
}
}
}
4 Answers
Derek Scollon
8,422 PointsYour lines of code...
case .Up: location.y + 1
case .Down: location.y - 1
case .Right: location.x + 1
case .Left: location.x - 1
...are along the right lines but they are calculating a value and not assigning it anywhere. As an example, for the first line...
case .Up: location.y = location.y + 1
...assigns the altered value, or the simpler form of this...
case .Up: location.y++
Jennifer Masserano
Courses Plus Student 2,571 PointsWhat is your default? I think that is missing.
Jennifer Masserano
Courses Plus Student 2,571 PointsYes, here you need a break statement. I'm working on this one too. :-)
Jennifer Masserano
Courses Plus Student 2,571 PointsAlso, I think that Robot is supposed to be a subclass. That maybe the issue.
Derek Scollon
8,422 PointsA default isn't needed in this case. The switch accounts for every possible value of Direction, so it is exhaustive without a default case.