Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Swift Functions and Optionals Optionals What is an Optional?

whats wrong with this ?

it says that i need to get an arument somthing something

search.swift
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 Found = search("Doc") { 
println("Found")
}

1 Answer

You need to add an else clause when returning nil. You also need to add the parameter "name" as when calling the search method, which is the "argument" that you are missing.

It should look like this after both stages:

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