Now you know the Ruby language: how do you get the most out of it? This book covers everything (almost) you need to be a complete Rubyist. How to design beautiful APIs and domain-specific languages; the ins and outs of testing and debugging; functional programming ideas and techniques that can simplify your code and make you more productive; writing code that's readable and expressive; and much more. There's a lot more to Ruby than just knowing the language. Learn how to take this rich, beautiful language and make the most of it.