27 March 2014 P2.0 (Printing)

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

25 June 2013 P1.0 (Printing)

First printing.

28 March 2013 B2.0

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.



24 February 2013 B1.0

  • New edition covers both Ruby 1.9 and Ruby 2.0.