I pushed my solutions to learnyounode to Github for critique/feedback as well as for other learners who might like to peek at what someone else did.
I don’t claim that these are by any means optimal solutions. They just happen to be the way I muddled through on my first try. All of these solutions do pass learnyounode verify except maybe my solution to number #13 (HTTP JSON API SERVER.)
In that case I was working in Cloud9 where the ports in the default tests weren’t guranteed to be available.
But I messed around with my solution enough to be satisfied that it would pass otherwise. If you confirm a problem with it or anything else please let me know.