Not sure on the Tuple Question (iOS - Swift). To modify the greeting to return both language and greeting.

Question

"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."

Answer 1 · 2014-10-12T05:00:07Z

October 12, 2014 5:00am

Hi Jason,

So if you remember back to the previous video tuples are constructed using opening and closing parentheses along with comma separated values inside them, for example.

let myVar = (10, 20, 30)

So what does the above actually do?

Well it creates a tuple we can extract values from using the dot notation, by default unnamed tuples carry indexes whereas if we name them we access the values using the name we give them.

For example.

let myVar = (10, 20, 30)
let aValue = myVar.0 // results in 10 as 10 is the zeroth value in the tuple

How do we apply this to the task?

Very simply, we know that we can declare any return type and a value of that chosen type so we just need to take that and apply it to the greeting function.

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

    return (greeting, language)
}

// greeting("John").greeting = "Hello John"
// greeting("John").language = "English"

So here we're using named tuples which is what the challenge is asking for but remember that they don't have any requirement to have names therefore we could even write the following but it wouldn't pass the challenge.

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

    return (greeting, language)
}

// greeting("John").0 = "Hello John"
// greeting("John").1 = "English"

There's also one other thing to know and that is named tuples don't have to be set in the order of the return type, for example.

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

    return (language: language, greeting: greeting)
}

This would result in the same outcome as the first code example above as our return type has the order set therefore they will appear in that order even though our return statement is backwards.

Answer 2 · 2014-10-12T15:52:04Z

October 12, 2014 3:52pm

This challenge was pretty different from the example in the video so I found it to be confusing. Great answer but the example and how it aligns to the challenge are very poorly done.

Answer 3 · 2014-11-04T12:30:44Z

November 4, 2014 12:30pm

I was having the same problem for couple of hours, did return watching the videos but couldn't make it right.

I was very skeptical thinking that I can only do {Bool, Strings //with the functions} That's why I didn't included the 'greeting' since it's String... I was fooled!

I just learnt that I can also do {Strings, Strings}

Answer 4 · 2015-09-11T17:07:42Z

September 11, 2015 5:07pm

Thank you SO much for this answer.

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Jason Zeall

Jason Zeall

Not sure on the Tuple Question (iOS - Swift). To modify the greeting to return both language and greeting.

4 Answers

Chris Shaw

Chris Shaw

So what does the above actually do?

How do we apply this to the task?

Jason Zeall

Jason Zeall

Richard Nash

Richard Nash

Chris Shaw

Chris Shaw

Kevin Frostad

Kevin Frostad

Dallas Matthews

Dallas Matthews

Matthew Chana

Matthew Chana

Dave Abalos

Dave Abalos

Cole Enabnit

Cole Enabnit