flagsoft.com
321 Zero! - Countdown - Flagsoft
321 Go!1 321 Go!1.1 Let's play a game! How to handle the lazy one1.2 Usage1.3 Privacy Policy1.4 About Swift - The new programming language from Apple1.4.1 .swift files1.4.1.1 Functions1.4.1.2 New Type Optional1.4.1.3 Declare an Optional1.4.1.4 Convert String to Optional Int1.5