P2.0 (Printing) - 27 March 2014

Internal updates for improved e-reader compatibility and consistency across platforms.

P1.0 (Printing) - 25 June 2013

First printing.

B2.0 - 28 March 2013

This release fixes all known errata. It is produced as a precursor to sending the book to the printer, so now would be a great time to submit any problems you find in this new version.



B1.0 - 24 February 2013

  • New edition covers both Ruby 1.9 and Ruby 2.0.