The Book Of Ruby is a free PDF-format guide to Ruby programming. Written by Huw Collingbourne, Technology Directory at SapphireSteel Software and one of the developers of the Ruby In Steel IDE for Visual Studio, The Book Of Ruby provides a comprehensive tutorial to all major aspects of Ruby programming.
The code from each of the twenty chapters is supplied in the download archive. If you are a Ruby In Steel user, you may load the entire code as a single Visual Studio solution and run the code using the integrated Ruby Console and debugger. There is no dependency on Ruby In Steel, however, and you may load the code into any editor and run the programs from the command prompt.
For the record, here are a few statistics on The Book Of Ruby. It contains:
425 pages
20 Chapters, plus an introductory section, appendices and an index
More than 84,000 words
Over 300 ready-to-run sample programs
It is 100% FREE!
To get a copy go to the Download page.