konrad1977

func login() {
    
    do {
        let token = try loginUserWithUsername("konrad1977", password: nil)
        print("user logged in \(token)")
    } catch LoginError.EmptyUsername {
        print("empty username")
    } catch LoginError.EmptyPassword {
        print("empty password")
    } catch {

konrad1977

func loginUserWithUsername(username: String?, password: String?) throws -> String {
    guard let username = username where username.characters.count != 0 else {
        throw LoginError.EmptyUsername
    }
    
    guard let password = password where password.characters.count != 0 else {
        throw LoginError.EmptyPassword
    }
    ///Handle all the other,
    return "token:" + username

konrad1977

enum LoginError : ErrorType {
    case EmptyUsername
    case EmptyPassword
}

konrad1977

enum TextCase {
    case Uppercase(String)
    case Lowercase(String)
}

let values: [TextCase] = [
    .Uppercase("FOO"),
    .Lowercase("iamlow"),
    .Uppercase("BAR"),
]

konrad1977

enum CustomError : ErrorType {
    case ErrorWithMessage(message: String)
}

func loginUserWithName(username: String?) throws -> String {
    guard let username = username where username.characters.count != 0 else {
        throw CustomError.ErrorWithMessage(message: "No username provided")
    }
    return "token:" + username

konrad1977

func greetingsForOptionals(name: String?) {
    
    guard let unwrappedName = name where unwrappedName.characters.count != 0 else {
        return
    }
    print("Greetings \(unwrappedName)")
}

var name: String? = "FooBar"
greetingsForOptionals(name)

konrad1977

var index = 0
repeat {
    index++
} while index < 100

konrad1977

var daysInMonth: Int = 30
var currentYear: 2000
let months: 12

enum Sex {
    case Male
    case Female
    case Unknown
}

konrad1977

func getWelcomeMessageToUser(user: String) -> String {
    return "Hello " + user
}

konrad1977

func myFirstFunction() {
    let message = "hello world!"
    print(message)
}