Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
john lau
3,471 PointsDon't understand why I can't pass it
Don't understand why I can't pass it
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) -> Point {
// Enter your code below
switch direction {
case .up: return location.y += 1
case .down: return location.y -= 1
case .left: return location.x -= 1
case .right: return location.x += 1
}
}
}
3 Answers
Michael Hulet
47,913 PointsYour code currently has some errors with the type system. You've specified that the move(_:) function should return a Point object, but it currently returns Void in all cases. In Swift, none of the assignment operators return a value like they do in Objective-C. Instead, they just return Void in all cases.
That being said, in the starter code for the challenge move(_:) is actually supposed to return Void. That's why it doesn't specify a return type. In Swift, when you omit a function's return type, it is assumed to return Void. If you remove your function's return type and all of the return statements within the function, I believe it should pass the challenge. Great job!
john lau
3,471 Pointsthks but just one detail it's asking me to return a value!
Michael Hulet
47,913 PointsIs this in an error message? The challenge's instructions don't say that it needs to return a value. In fact, adding a return value to the move(_:) function will make it an entirely different function in the eyes of Swift than the one that the challenge is expecting to test
john lau
3,471 Pointsok got it, got confused with the return of the function and the enum . thks