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iOS Swift Functions and Optionals Optionals What is an Optional?

Problem with example code on Optionals in Xcode 6.3 and Xcode 7 beta

I was trying the chapter code in Xcode 6.3 and it gave following error func findApt (aptNumber: String) -> String? { let aptNumbers = ["101","202","303","404"] for tempAptNumber in aptNumbers { if ( tempAptNumber == aptNumber) (This line it says in Xcode 6.3 "could not find an overload for == that accepts the supplied arguments" ) { return aptNumber } }

return nil


if let culprit = findApt("102") { print("Apt found: (culprit)") } Kindly help

func search(#name: String) -> String {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
    return ""

1 Answer

I'm sorry but I cannot help you with this code but I'm pleased to tell you don't use xcode beta while you're learning swift 1. xcode beta is made for swift 2 and i guess you don't know this language!