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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.
Kind of nice to have a background story. Could use a test for the move method, as it's mentioned in the description.
+1 to code quality metrics.
It's hard to write something that is at the same time really efficient, small and yet readable. For me, that's elegant code. Maybe one metric could be all the others combined.