Haven't seen - there are more restrictions than content to learn something...

Then your kata has a different goal than my "restricted katas" (my goal isn't to enforce one particular (type of) solution) :) I've solved the kata without cheating, so I'm done. :)

Actually, I upvoted and ranked this kata but becuase I don't like the "add new restriction after every new solution approach" I removed my upvote. Because of this approach it's hard to assess the rank as the kata becomes harder and harder.

Regards,

suic

This is way to restrictive. :( It's good to leave at least some variability.
If you want to be that strict then

1. prohibit class too.
2. make the search case insensitive.

Regards,

suic

That's right. I'm not saying that this is the shortest :)