This book is an updated and expanded version of Ruby in a Nutshell (O’Reilly) by Yukihiro Matsumoto, who is better known as Matz. It is loosely modeled after the classic The C Programming Language (Prentice Hall) by Brian Kernighan and Dennis Ritchie, and aims to document the Ruby language comprehensively but without the formality of a language specification. It is written for experienced pro…