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 Swift 2.0 Functions Function Parameters Returning Complex Values

Nikolas Soley
Nikolas Soley
10,412 Points

Difficulties with last exercise of Swift 2.0 Functions course.

The last Code Challenge states: For this challenge, let's say we're building a component of an app that allows a user to type in a location of a famous landmark and get back the geographical coordinates.

To keep the scope limited, let's say we're only working with the following values.

Eiffel Tower - lat: 48.8582, lon: 2.2945 Great Pyramid - lat: 29.9792, lon: 31.1344 Sydney Opera House - lat: 33.8587, lon: 151.2140

Declare a function named getTowerCoordinates that takes a single parameter of type String, named location, and returns a tuple containing two Double values (Note: You do not have to name the return values)

Use a switch statement to switch on the string passed in to return the right set of coordinate values for the location.

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.

For the default case in the switch statement, return (0,0).

The attached code is working in the "Playground", but treehouse says: "Bummer! Make sure you are returning the correct values for each case statement". I am not sure what I am missing here.

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

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points

Hey Nikolas Soley,

You're on the right track, but lets fix a few things here.

First, your location parameter does not need to be a variable parameter, as you won't be modifying it inside of the function's body, you'll just perform a switch on it to match for specific values.

Second, you don't need a variable to store what is being returned from this function. You can return the specified tuple for each case of the switch statement directly. What we want to return a tuple of type (Double, Double), as you correctly specified as your functions return type.

Third, a minor typo. You have misspelled "Eiffel". See my code below for these changes:

// Enter your code below
func getTowerCoordinates(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)

Hope this helps! Good Luck!