Intro-to-jruby is a project mainly written in JAVASCRIPT and RUBY, it's free.
Source for my (now outdated) Intro to JRuby talk.
This is the source code for the Introduction to JRuby presentation
=== Generating the presentation
Install the codex, RedCloth and rubigen gems.
Go to the root of the git repository and run "rake all"
=== Viewing the presentation
Open html/all.html into a browser.
=== More Information
See http://github.com/pragdave/codex/tree/master for more information codex itself.
=== How's my code testing
I'm just testing How's my code.