iOS Swift Optionals Stage 3 Help

the task states: 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".

we need to use what is known as optional binding. see the below excerpt from the Swift eBook:

You use optional binding to find out whether an optional contains a value, and if so, to make that value available as a temporary constant or variable. Optional binding can be used with if and while statements to check for a value inside an optional, and to extract that value into a constant or variable, as part of a single action. if and while statements are described in more detail in Control Flow.

Write optional bindings for the if statement as follows:

if let constantName = someOptional {
    statements
}

we can use the if let statement to unwrap the optional into a local constant. the code in this block will only get executed if the optional returns a value that is not nil

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") {
   // result has a value, name was found
   println("Found")
}