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iOS Swift Functions and Optionals Optionals What is an Optional?

Austin Vaughan
Austin Vaughan
874 Points

How do I resolve an "Unresolved Identifier"?

I am attempting to use the if-let statement to assign the value of a function named "search" to a constant named "result". The problem I'm facing is when I attempt to assign the function to a constant I am receiving error messages stating that I have an unresolved identifier. Furthermore, when I attempt to call upon the function and use the constant "result" I receive the same message.

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 
let n = result 
if result = search("Doc") {

1 Answer

Piotr Nejman
Piotr Nejman
3,374 Points

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