Thanks for the snippet(s). I tend to like your second solution the best for the same reason that I like Grand’s — it tells the story of its functionality. The next step would be to lose your heads. ;) I agree with all of your comments and it goes to show that although Clojure can quite easily be translated directly from Scheme, that approach is not likely to yield idiomatic results.

-m

http://gist.github.com/169171

My comments on the original solution:

• Using multiple if forms feels a bit clunky to me (& not so functional).
• The single function makes it a little harder to follow.
• The need to reverse the result feels a bit awkward.

Thanks for the challenge!