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iOS Swift 2.0 Functions Function Parameters Returning Complex Values

Matt Smith
Matt Smith
878 Points
Posted by Matt Smith
Matt Smith
878 Points

How to return a tuple containing two values?

What do I need to change to fix the error? Can someone recap for me too what a tuple is and how it relates to Doubles.

functions.swift 
// Enter your code below
func getTowerCoordinates(location: String) {

    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
}

getTowerCoordinates("Eiffel Tower")

4 Answers

Mohamed Moukhtar
PLUS
Mohamed Moukhtar
Courses Plus Student 6,151 Points
Mohamed Moukhtar
Mohamed Moukhtar
Courses Plus Student 6,151 Points

A tuple is a group of zero or more values represented as one value. For example a tuple of ("Matt", "Smith") holds your first and last name. You can access the inner values using the dot(.) notation followed by the index of the value For example: var person = ("Matt", "Smith") // a tuple var firstName = person.0 // Matt var lastName = person.1 // Smith

Tuples are value types and it can hold values of any type like Double, Int, or String

And here is a fix for your code

func getTowerCoordinates(location: String) -> (latitude: Double, longitude: 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)
}

}

let cooridnate = getTowerCoordinates("Eiffel Tower") cooridnate.latitude cooridnate.longitude

Matt Smith
Matt Smith
878 Points
Matt Smith
Matt Smith
878 Points

Thanks for the explanation of Tuples. But, I've tried copying your exact reply into the editor and it isn't letting me progress.

Mohamed Moukhtar
PLUS
Mohamed Moukhtar
Courses Plus Student 6,151 Points
Mohamed Moukhtar
Mohamed Moukhtar
Courses Plus Student 6,151 Points

I am so sorry for the inconvenience, I didn't check the challenge before submitting my reply.

try to copy the following code and it will work:

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) } }

Mohamed Moukhtar
Mohamed Moukhtar
Courses Plus Student 6,151 Points
Mohamed Moukhtar
Mohamed Moukhtar
Courses Plus Student 6,151 Points

The difference between the two codes are: 1- In the second code I didn't use a named tuple (to comply with the challenge requirement) 2-In the second code I removed the coordinate constant

but both codes will work with you on Xcode Playground.

I hope that I helped you.

Matt Smith
Matt Smith
878 Points
Matt Smith
Matt Smith
878 Points

Thank you, trying to pass the challenge in the mean time certainly got me familiar with tuples.

Tyron Spencer
Tyron Spencer
1,489 Points
Tyron Spencer
Tyron Spencer
1,489 Points

Hi, Mohamed Moukhtar .. Just wanted to thank you, this helped me also

Antonio Moreda
Antonio Moreda
2,304 Points
Antonio Moreda
Antonio Moreda
2,304 Points

This worked for me on the XCode playground giving the correct result but didn't work on the Challenge:

func getTowerCoordinates(location: String) -> (lat: Double, lon: Double) {

  let lat = Double()
  let lon = 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)
    }
}

let result = getTowerCoordinates("Eiffel Tower")

result.lat
result.lon
Antonio Moreda
Antonio Moreda
2,304 Points

Well this Challenge took forever but i finally got it to work. All I needed to do was eliminate the names for the return values.

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)
    }
}