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iOS Swift Functions and Optionals Optionals What is an Optional?

Pablo Grippo
Pablo Grippo
25,765 Points
Posted by Pablo Grippo
Pablo Grippo
25,765 Points

Using the if-let statement I can't figure out what I'm doing wrong.

My code is:

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

But it throw me an error and I don't know why? Please, help me!

Thanks in advance!

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

1 Answer

Zack Richard
Zack Richard
6,313 Points

Hi Pablo,

The problem is that when you call the search function, you need to precede "Doc" with name:. This is because #name is in the function definition's parameter list:

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" ) {
    println( "Found" )
}