Will A. Craig. Understanding Swift Programming: Swift 2 with Hands-on Online Exercise

Tenaya Creek Press, 2015. — 582 р. — ISBN: 978-0-9962281-1-4.Swift, Apple's new language for app development, has been widely praised for its clean, safe, and feature-rich design. The language is poised to quickly replace Objective-C for developing iOS apps.Swift is now the 15th most popular language (Objective-C is #14, having sunk like a stone from #3).If you are serious about iOS app development, you should start learning Swift now.Although Swift at its core is a fun and easy-to-use language, it does have some aspects that are likely to be new to you. Like optional values. Its more sophisticated use of functions and closures. The new class-like data types of structures and enumerations. The sophisticated matching in swift statements. Generic programming. And the use of protocols as a substitute for inheritance in the new approach of "protocol oriented programming".