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iOS Swift 2.0 Functions Function Parameters Returning Complex Values

Posted by Matt Conway
Matt Conway
1,572 Points

Function with switch

Still not working .... ??

Challenge Task 1 of 1

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).

/Users/mattconway/Desktop/Screen Shot 2016-01-18 at 8.17.49 PM.png

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

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Matt Conway,

You're close! There's only two things you need to fix. First, every case, including the default case, has to have a return statement before the tuples you want to return. Second, you then need to call your getTowerCoordinates function and pass it in a string to evaluate (because it takes a single argument of string). You're switching on this string that you pass in, inside your switch statement.

// 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)
    }

}

getTowerCoordinates("Eiffel Tower")

Good Luck!