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

iOS Functions in Swift Adding Power to Functions Returning Complex Values

Posted by Chris Beal
.a{fill-rule:evenodd;}techdegree
Chris Beal
iOS Development Techdegree Student 793 Points

Do I need to use switch?

So with the question: Declare a function named coordinates that takes a single parameter of type String, with an external name for, a local name of location, and returns a tuple containing two Double values (Note: You do not have to name the return values). For example, if I use your function and pass in the string "Eiffel Tower" as an argument, I should get (48.8582, 2.2945) as the value. If a string is passed in that doesn’t match the set above, return (0,0)

I believe I created the tuple. but do I need to create a switch function and cases? Not sure how else to have it be (0,0)

functions.swift 
// Enter your code below
func coordinates(for location: String) -> (lat: Double, Ion: Double) {
  switch location {
    case "Eiffel Tower" - lat: 48.8582, lon: 2.2945
    case "Great Pyramid" - lat: 29.9792, lon: 31.1344
    case "Sydney Opera House" - lat: 33.8587, lon: 151.2140
    default: location = 0
    }
return(lat, Ion)
}

coordinates(for: "Eiffel Tower")

1 Answer

Jeff McDivitt
Jeff McDivitt
23,970 Points
Jeff McDivitt
Jeff McDivitt
23,970 Points

Hi Chris -

  1. You do not need the lat and lon in your return
  2. You are missing your returns for you switch statement
  3. You are missing your default return of (0,0)
func coordinates(for location: String) -> (Double,Double) {

    switch location {
    case "Eiffel Tower":
        return (48.8582,2.2945)
    case "Great Pyramid":
        return (29.9792,31.1344)
    case "Sydney Opera House":
        return (33.8587,151.2140)
    default:
        return (0,0)
    }

}