This book is a tutorial and reference for the Ruby programming language. Use Ruby, and you'll write better code, be more productive, and enjoy programming more. The book is a guide to working with the object-oriented programming language, teaching the basics, plus how to write large programs, how to extend Ruby using C code, and much more.
This is the HTML version of the "Programming Ruby" book by David Thomas and Andrew Hunt, published by Addison-Wesley and graciously licensed under the Open Publication License.