Difficulties with last exercise of Swift 2.0 Functions course.

Question

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.
```functions.swift
// 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)
}
```

Steven Deutsch · Accepted Answer

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:
Swift
// 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!

Welcome to the Treehouse Community

Looking to learn something new?

Nikolas Soley

Nikolas Soley

Difficulties with last exercise of Swift 2.0 Functions course.

1 Answer

Steven Deutsch

Steven Deutsch