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 Tahani Al-Shumrani
.a{fill-rule:evenodd;}techdegree
Tahani Al-Shumrani
iOS Development Techdegree Student 2,022 Points

declare a function Declare a function named coordinates that takes a single parameter of type String, with an externa

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)

functions.swift 
func coordinates(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)

    }
}

3 Answers

John Hendrix
John Hendrix
21,844 Points
John Hendrix
John Hendrix
21,844 Points

Wow, it took longer than I thought but mine was finally accepted with the above correction from Michael Ayoub.

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)

    }
}
Christopher Kehl
Christopher Kehl
18,180 Points

You would think that teamTreeHouse would use some examples that were covered in the lessons vs having to google search the web.

Michael Ayoub
Michael Ayoub
7,689 Points
Michael Ayoub
Michael Ayoub
7,689 Points

You didn't add the external name for the function parameter which is "for" so the function should be:

func coordinates(for location: String) -> (Double, Double)

John Hendrix
John Hendrix
21,844 Points
John Hendrix
John Hendrix
21,844 Points

Originally mine would not work because I kept trying "forLocation location." I don't really understand why that didn't work. I thought that was what it meant to name the external name as for.

func coordinates(forLocation location: String) -> (Double, Double) {