Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift Functions and Optionals Optionals What is an Optional?

Posted by Leon Houlier
Leon Houlier
25,614 Points

What's wrong ?

Using the if-let statement, assign the value from the search function to a constant named result. If the name was found, use println to print out the string "Found". When calling the search function, pass it the name "Doc".

my code is: 

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
}

if let result = search("Doc") {
    println("Found")
}```

2 Answers

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

since name is an external parameter (you used #name in the function definition, which means there is an external parameter called name, and an internal parameter called name as well), you must include it in the function call:

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
}

if let result = search(name: "Doc") {
    println("Found")
}
Leon Houlier
Leon Houlier
25,614 Points

Thanks a lot!

karan patel
karan patel
1,046 Points
karan patel
karan patel
1,046 Points

'''html <p> 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 }

if let result = search(name: "Doc") { println("Found") } </p> '''