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
joelbumpus
3,354 PointsWhat am I missing? The code passes in Xcode but not Treehouse.
This is what I receive as an error from Treehouse.
swift_lint.swift:32:19: error: argument names for method 'move(direction:)' do not match those of overridden method 'move' override func move(direction: String){ ^ _
class Point {
var x: Int
var y: Int
init(x: Int, y: Int) {
self.x = x
self.y = y
}
}
class Machine {
var location: Point
init() {
self.location = Point(x: 0, y: 0)
}
func move(_ direction: String) {
print("Do nothing! I'm a machine!")
}
}
// Enter your code below
class Robot: Machine {
override func move(direction: String){
switch direction{
case "Up" : location.y += 1
case "Down" : location.y -= 1
case "Left" : location.x -= 1
case "Right" : location.x += 1
default : break
}
}
}
2 Answers
Halil Bayrakci
3,884 PointsI think it should be fine if you add an underscore to your function like the superclass function
override func move(_ direction: String){
joelbumpus
3,354 PointsThanks to both of you! Always good to have another set of eyes. You both rock!
Matt Skelton
4,548 PointsMatt Skelton
4,548 PointsYou'll kick yourself once you see it, though it's such an easy one to get tripped up by!
You've spotted the line that's throwing the error, the problem is that your override function signature doesn't quite match the one outlined in the parent class. The compiler is very particular, and your parent class has an external name of '_', whereas the overridden function doesn't have an external name.
Make sure your external and internal parameter names match up and you should be good to go!