From the readme:
This is the fourth complete Bible reference parser that I’ve written. It’s how I try out new programming languages: the first one was in PHP (2002), which saw production usage on a Bible search website from 2002-2011; the second in Perl (2007), which saw production usage on a Bible-related site starting in 2007; and the third in Ruby (2009), which never saw production usage because it was way too slow. This Coffeescript parser (at least on V8) is faster than the Perl one and 100 times faster than the Ruby one.
My main interest in open-sourcing and thoroughly documenting this code lies in giving future programmers data and code that they can use to build better parsers. While this code reflects my experience, it’s hardly the last word on the subject.