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iOS Swift Functions and Optionals Parameters and Tuples Tuples

Posted by Barry Maloney
Barry Maloney
2,583 Points

what is the secret with tuples

stumped with every step. I have watched the video twice and spent 20 minutes on this.

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

    return result

4 Answers

Daniel Sattler
Daniel Sattler
4,867 Points
Daniel Sattler
Daniel Sattler
4,867 Points

Important is the right order of everything:

func greeting(#person: String) -> (language:String,greeting:String) {
    let language = "English"
    let greeting = "Hello \(person)"
    var greet = (greeting,language)
    return greet
}
var result = greeting(person: "Tom")
println(result.1)

Try this

Barry Maloney
Barry Maloney
2,583 Points

I notice you added the hashtag for person. What does that do?

Daniel Sattler
Daniel Sattler
4,867 Points
Daniel Sattler
Daniel Sattler
4,867 Points

it turns the value person into a named value. If i remember correct it was required in the challenge. 

func greeting(#person: String)

If you do so, by calling the function, you will have to pass the named value

greeting(person: "Tom")

if you do it this way

func greeting(person: String)

you can do it this way

greeting("Tom")
Barry Maloney
Barry Maloney
2,583 Points
Barry Maloney
Barry Maloney
2,583 Points

Thanks Daniel.

I moved on to Optionals and got stuck on the second challenge now. The system keeps spitting me out when I try to correct and making me start over. Getting frustrated.

Can you point me in the right direction with this code. The editor keeps asking if I've used println().

func search(#name: String) -> String? { let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"] for n in names { if n == name { return n } } return nil

// let dwarf = search (name:"") //dwarf!

if let result = search(name:"Doc") { println("Found (result)")

} }

Daniel Sattler
Daniel Sattler
4,867 Points
Daniel Sattler
Daniel Sattler
4,867 Points

Ok... a few issues here:

first of all, code after "return" will never be executed

second Your string interpolation is incorrect.

You say

println("Found (result)")

You forgot a back slash here

println("Found \(result)")

Try it this way

func search(#name: String) -> String? {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
        } else {
            return nil
        }
    }
    return name


}
if let result = search(name:"Doc") {
    println("Found \(result)")

}

you need to ad your if let AFTER the function ;-)

Barry Maloney
Barry Maloney
2,583 Points

I got it Daniel. the println command only wanted "Found" without the value. I hate being so needy but there's no way to move on without getting thru the challenges. Thanks for hanging in there with me.

{ println("Found") }