This repository is based on Ian Oliver Opa tutorials (http://ijosblog.blogspot.fi/) and has some code tweaks on top of them.
- Part 1: http://ijosblog.blogspot.fi/2012/07/opa-language-tutorial-part-1.html
- Part 2: http://ijosblog.blogspot.fi/2012/07/opa-language-tutorial-part-2.html
- Part 3: http://ijosblog.blogspot.fi/2012/08/opa-language-tutorial-part-3.html
- Part 4: http://ijosblog.blogspot.fi/2012/08/opa-language-tutorial-part-4.html