Metaprogramming Ruby Program Like the Ruby Pros

As a Ruby programmer, you already know how much fun it is. Now see how
to unleash its power, digging under the surface and exploring the
language’s most advanced features: a collection of techniques and
tricks known as metaprogramming. Once the domain of expert Rubyists, metaprogramming is now accessible to programmers of all levels—from beginner to expert. Metaprogramming Ruby
explains metaprogramming concepts in a down-to-earth style and arms you
with a practical toolbox that will help you write great Ruby code.