This book is a reference for the Ruby programming language. It describes the language structure, its core classes and standard library, and provides some additional useful information and links for Ruby development.
The Reference is intended to be always up-to-date with the current Ruby version.
Most of the reference content is taken directly from Ruby documentation and reorganized for easier reading. The core docs were augmented with some quotes from the Ruby website, and some missing content that is written specifically for the book. The source of the book (rendering scripts, config, and unique content) can be found at GitHub.