Whether you just want to learn Ruby, or if you already know Ruby and want to learn about its internals and newest features, this is the book to get. Programming Ruby has been the definitive reference book on Ruby for more than 20 years. This fully revised and updated edition covers Ruby up to and including Ruby 4. The first section of the book is a tutorial introduction that gets you up to speed with the Ruby language and its most important features. You'll learn how to use Ruby's powerful built-in classes and libraries to write code that is clear and flexible. The next sections look at the Ruby ecosystem, including Ruby as a command-line program and as an interactive tool. Ruby's debugging, packaging, and documentation tools are also covered. You'll learn about Ruby style, and get a detailed description of the Ruby object model and metaprogramming. The final parts of the book are more advanced. You'll find a full reference to the language and a curated guide to Ruby's libraries focusing on the most useful features from the dozens of classes and hundreds of methods shipped as part of the language. Ruby makes your programming more productive; it makes coding fun again. This book will get you up to speed with the very latest Ruby features and tools quickly and enjoyably.
