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iOS Swift Functions and Optionals Optionals What is an Optional?

Posted by Thomas Gusso
Thomas Gusso
820 Points

optional task 2 of 2. if let search = names ("Doc") error: use of unresolved identifier 'names' can't find a fix

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".

here's my code:

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

3 Answers

Steve Pham
Steve Pham
1,488 Points
Steve Pham
Steve Pham
1,488 Points

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

Sinoheh Enayati
Sinoheh Enayati
4,528 Points
Sinoheh Enayati
Sinoheh Enayati
4,528 Points

Hello. the names variable must define in public location not in for loop. or you must write like this

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 names = search("Doc")
{
    println("Found = \(names)")
}
Kieran Tross
Kieran Tross
8,266 Points
Kieran Tross
Kieran Tross
8,266 Points

Your code is incorrect. This is how the challenge wants you to write out the code. you need to name the constant "result". Then you need to assign it the value from the search function. The parameters should detail "name: Doc".

Please see the below correct code i've supplied.

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") }

David Maybach
David Maybach
2,092 Points
David Maybach
David Maybach
2,092 Points

why passing the label name? it wasn't part of the video tutorial. I would have never guessed it :( or maybe after 100 tries