What is the aim of the book<Meta Programming in Ruby>?

I want to know that what will someone after reading this book will add to his learning?

You'll add the ability to do metaprogramming in Ruby.

...and hopefully, you'll learn a lot of things about how Ruby works - things that are important, but not immediately obvious. A lot of people tell us that we didn't pick a good title, because "metaprogramming" sounds intimidating, but it's actually just a set of techniques that good Ruby coders use every day. Maybe we should have titled the book something like "What every Ruby programmer should know".