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iOS Swift Functions and Optionals Optionals What is an Optional?

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".

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") {

1 Answer

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")?{

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

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