fuckingNSString.swift

func uglyFirstLetterTransformation(str: String) -> String? {
    
    if str.isEmpty {
        return .None
    }
    
    let Letters = NSCharacterSet.letterCharacterSet()
    let Numbers = NSCharacterSet.decimalDigitCharacterSet()
    
    let firstLetter : NSString = str.substringToIndex( advance(str.startIndex, 1) )
    let flAsUniChar : unichar = firstLetter.characterAtIndex(0)
    
    var result = ""
    
    
    switch (flAsUniChar) {
        
    case 223:                   // Sonderbehandlung fürs ß. 223 ist dessen Wert als unichar
        result = "S"
        
    case let c where Letters.characterIsMember(c):
        let base = firstLetter.stringByFoldingWithOptions(NSStringCompareOptions.DiacriticInsensitiveSearch,
                                                          locale: NSLocale.currentLocale())
        result = base.uppercaseString
    
    case let c where Numbers.characterIsMember(c):
        result = firstLetter
    
    default:
        result = "&!"
    }
    
    return result
}


let testCases = [
    "1 Test",       // Zahl
    "x Test",       // Buchstabe
    "ß Test",       // ß
    "ä Test",       // Umlaut
    ". Test",       // Punktuation
    " Test",        // Whitespace
    ""              // Empty
]


for test in testCases {
    
    if let result = uglyFirstLetterTransformation(test) {
        print(test)
        print(" -> ")
        println(result)
    } else {
        println("nil")
    }
    
}