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iOS Swift Functions and Optionals Optionals What is an Optional?

Paula Carvajal
Paula Carvajal
1,679 Points
Posted by Paula Carvajal
Paula Carvajal
1,679 Points

how to use an if-let statement

I am not sure what I am ding wrong. This is the challenge: 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".

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 result = search("Doc") {
println("Found")
}

1 Answer

Juan Francisco Andrade Álvarez
Juan Francisco Andrade Álvarez
23,997 Points
Juan Francisco Andrade Álvarez
Juan Francisco Andrade Álvarez
23,997 Points

Well, first i'd recommend that you check the compiler tab to see any error. This is the answer:

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

Make sure you use well the if-let sintaxis, that you use the "name" parameter and the "?" after the function signature because it returns an optional.

Stepan Ulyanin
Stepan Ulyanin
11,318 Points
Stepan Ulyanin
Stepan Ulyanin
11,318 Points

I believe you don't have to use ? after the signature