One of the bigger announcements in today’s WWDC keynote, at least on the developer side, was the introduction of the Swift programming language.

And to help developers understand the new language, Apple has just posted a comprehensive book on the iBookstore. “The Swift Programming Language,” is 500 pages and can be downloaded now for free to read on your iOS device or Mac.

The book offers a tour of the language, a detailed guide of each feature, and a formal reference for the language.

Apple says the language is designed to be faster, clearer, and more effective than Objective-C. In the Swift playground, developers can see their programming in what amounts to a live preview.

Swift builds on the best of C and Objective-C programming without the constraints of C compatibility.

If you missed any of today’s coverage, Apple has just posted the complete video of the keynote address to its site. Along with iOS 8 and OS X 10.10, Apple announced a number of other new features for developers like the HomeKit API for smart devices and the Metal graphics technology.