Ruby In A Nutshell by Yukihiro Matsumoto
O'Reilly Media; 1 edition | November 20, 2001 | English | ISBN: 0596002149 | 202 pages | PDF | 2 MB
Ruby is an absolutely pure object-oriented scripting language written in C and designed with Perl and Python capabilities in mind. While its roots are in Japan, Ruby is slowly but surely gaining ground in the US. The goal of Yukihiro Matsumoto, creator of Ruby and author of this book, is to incorporate the strengths of languages like Perl, Python, Lisp and Smalltalk.