This is a useful article on metaprogramming idioms in Ruby.
I have been thinking much about Metaprogramming lately. I have come to the conclusion that I would like to see more examples and explanations of these techniques. For good or bad, metaprogramming has entered the Ruby community as the standard way of accomplishing various tasks, and to compress code. Since I couldn’t find any good resources of this kind, I will start the ball running by writing about some common Ruby techniques. These tips are probably most useful for programmers that come to Ruby from another language or haven’t experienced the joy of Ruby Metaprogramming yet.