Stuck on Challenge

"Your function needs to return a tuple containing two Double values " Getting the above error with this code! How do you correct this?

Yes I am getting the error with your code.

Try this out.

// Enter your code below
func getTowerCoordinates(location: String) -> (Double, Double) {
   switch location {
      case "Eiffel Tower" : return (48.8582, 2.2945)   // return the value
      case "Great Pyramid": return (29.9792, 31.1344)   // return the value
      case "Sydney Opera House": return (33.8587, 151.2140)   // return the value
      default: return (0,0)   // return the value
   }
}

He mentions that you do not have to name the tuple return types.

Richard Lu and Brian Patterson,

It's not a bug. The directions specify not to name the return values

(Note: You do not have to name the return values)

In Swift functions have signatures so the function Brian has above has a signature of

String -> (lat: Double, long: Double)

If you don't name the parameters , the signature is

String -> (Double, Double)

While this seems trivial, it means that I can't really validate answers that return named tuples because then I have to required everyone to pass in named tuples. It's an either or situation. If everyone returns named tuples then I have to restrict the names you can use because as you can see from the function, the names are hard coded into the resulting signature and I have to check you're passing in the correct names.

Long story short, since Swift is type safe, minor things like this make the underlying code quite different

Thank you for the reply. I understand now. Really enjoying the course and I appreciate the speedy reply.

Hey Alia Khan

You can think of each case in a switch statement as a path of code through the function. If you hit a particular case, only the code in that case is executed. In this line of code:

case "Eiffel Tower" : (48.8582,2.2945)

You're not doing anything with the tuple that you create. It's created in that particular case, but you're not storing it in a variable or constant. So the moment you are done with the case, those values cease to exist.

Now if in each case you stored it in a variable that you declare at the top of the function and assign the tuple to that variable you can use it at the end to return out of the function.

Basically if you see curly braces in code, what is created within curly braces doesn't exist outside out of it unless you assign it to a constant or variable declared outside of it. The switch statement starts a new set of curly braces; anything created inside the switch statement exists within those braces only. This concept is called scope.

So yeah the reason you can't return at the end in your code is you're not returning any values.

Hey victorripley

(1) This is the older Swift 2 version of the course. There's a newer, Swift 3 version. From your code it seems like you're using Swift 3 version but just want to double check because you're posting in Swift 2 course section.

(2) The reason you're getting this error is because your function is returning (double double). For staters, double, with lower case D is not an actual type. Second, you need to comma separate values in a tuple