A number to word translator in ruby for arbitrary large numbers, implemented with a cool recursive algorithm. Right now there's support for decillions, but that's just because I had to stop writing the names at some point. One could easily add support for numbers of any size by adding more prefixes to the ORDER_NAMES hash in number_names.rb.
Tests are included in num_to_word_tc.rb. There are 24 right now, I tried to think of as many weird cases as I could. I've also been trying to come up with a good way to do random testing, but I can't come up with a good invariant. If you have any ideas I'm all ears.
irb> require './num_to_word.rb'
=> true
irb> NumToWord.translate(289473)
=> "two hundred eighty-nine thousand four hundred seventy-three"