Rachel Keranen 
Power of Ruby [PDF ebook] 

Although Yukihiro Matsumoto released Ruby in 1995, it would take more than a decade for the programming language to achieve widespread adoption. Today, Ruby is one of the fastest growing coding languages, and it is behind major sites like Hulu and Twitter. This book describes the history of the language, the relationship between Ruby and Ruby on Rails, and why Ruby is an ideal first language for new programmers, complete with tips on how readers can get started.