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iOS Swift Functions and Optionals Optionals What is an Optional?

David Sheridan
David Sheridan
8,579 Points
Posted by David Sheridan
David Sheridan
8,579 Points

Having trouble assigning values with my if let statement

I've tried a few different options now and I don't know where to go next

David Sheridan
David Sheridan
8,579 Points
David Sheridan
David Sheridan
8,579 Points 
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")
}
David Sheridan
David Sheridan
8,579 Points
David Sheridan
David Sheridan
8,579 Points 
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")
}

3 Answers

Steve Hunter
Steve Hunter
57,712 Points

Hi David,

The only thing I can see that's wrong is that you've ignored the fact there's a # in front of the parameter. You need to use name: when calling the function.

Clicking on Preview will show you the error. Corrected code looks like:

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"){ // use name:
  println("Found")
}

Your code throws this error:

swift_lint.swift:17:24: error: missing argument label 'name:' in call
if let result = search("Doc"){
                       ^
                       name:

I hope that helps.

Steve.

David Sheridan
David Sheridan
8,579 Points
David Sheridan
David Sheridan
8,579 Points

Hey Steve, thanks for your help, I adjusted my code but im still having trouble.

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")
}
Steve Hunter
Steve Hunter
57,712 Points

Hi David,

When you use the parameter label, you don't include the hash. You declare the label with the hash in the method signature but use it without:

func search(#name: String) -> String? { // declared with a hash
.
.

// used without
if let result = search(name: "Doc"){

I hope that gets you through.

Steve.

David Sheridan
David Sheridan
8,579 Points
David Sheridan
David Sheridan
8,579 Points

That worked, thanks for the help!

Steve Hunter
Steve Hunter
57,712 Points

No problem - glad you got sorted. :-)