Problem executing the code provided at Swift Functions and Optionals

Question

Swift 2.0
func findApt (aptNumber : String) -> String ?{
    let aptNumbers = ["101","202","303","404"]
    for tempAptNumber in aptNumbers {
        if ( tempAptNumber == aptNumber) {
            return aptNumber
        }
    }
return nil
}
if let culprit = findApt("505"){
print("Apt Found")
}
```
This code won't run. I'm puzzled. Help please.

Brendan Whiting · Answer

I did a couple things:
I took out the space between "String" and "?" when you defined your return value
I made a new variable of type String? and declared it first thing inside the code block.  It's default value is nil.  If it finds a matching aptNumber, it puts that String in, otherwise it stays nil.  Regardless, it will return that variable.  
Here's my code:
```Swift
func findApt (aptNumber : String) -> String? {
    var returnValue: String?
    let aptNumbers = ["101","202","303","404"]
    for tempAptNumber in aptNumbers { 
        if ( tempAptNumber == aptNumber) {
            returnValue = aptNumber
        }
    }
    return returnValue
}
if let culprit = findApt("505") {
    print("Apt Found")
}
```

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Antonio Montalvo

Antonio Montalvo

Problem executing the code provided at Swift Functions and Optionals

1 Answer

Brendan Whiting

Brendan Whiting