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iOS Swift Functions and Optionals Parameters and Tuples Tuples

William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points
Posted by William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points

Can't really grasp the concept of Tuples..

Need a little walkthrough on this Tuple challenge :)

tuples.swift 
func greeting(person: String) -> String {
    let language = "English"
    let greeting = "Hello \(person)"

    return greeting
}
William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points
William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points

Here is the Challenge:

Currently our greeting function only returns a single value. Modify it to return both the greeting and the language as a tuple. Make sure to name each item in the tuple: greeting and language. We will print them out in the next task.

4 Answers

ianhan3
ianhan3
4,263 Points

The greeting function above basically just returns a String value. You want to return two values, each of type string, based on the values given in the function.

func greeting(person: String) -> (greeting: String, language: String) {
    let language = "English"
    let greeting = "Hello \(person)"

    return (greeting, language)
}

So you want to tell the function to return two strings in the function declaration then do the same in the return statement as well. Does that make sense?

ianhan3
ianhan3
4,263 Points
ianhan3
ianhan3
4,263 Points

In the second exercise, they ask you to: "Create a variable named result and assign it the tuple returned from function greeting. (Note: pass the string "Tom" to the greeting function.)"

Super simple, just follow exactly what they say.

  • "Create a variable named result"
var result =
  • Assign it to the tuple returned from the function "greeting"
var result = greeting()
  • Pass it the string "Tom" into the greeting function
var result = greeting("Tom")
ianhan3
ianhan3
4,263 Points
ianhan3
ianhan3
4,263 Points

Third is just dot notation to access the value.

"Using the println statement, print out the value of the language element from the result tuple."

println(result.language)

Note: In Swift 2.0 println() just becomes print() but for the sake of the exercise it's still Swift 1.X

William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points
William Hartvedt Skogstad
William Hartvedt Skogstad
5,857 Points

Thanks a lot for such a detailed walkthrough! It really helped to get an understanding of how Tuples work :)