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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Yeah!, You're right. I did't see that situtation. Well, the tests will be better..
I think the 'in map' if/else conditional at the bottom of your move function will fail to catch the case where, e.g. you're at position 10 and try to move left. That should probably be checked for in the suite of submission tests, and perhaps I'm missing something obvious.
Yeah, I totally refactored this just after I submitted ;)