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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.
I know this is late to the party, but I would much rather read clear and concise solutions over 10-12 lines than an overly complicated one-liner that gives anyone but the author a headache to look at (though this soluion is nice I think, not hating). Solving a problem in 1-3 lines can be cool and elegant, or it can be messy as hell. Case in point is my solution to this task, which passed the tests but is just horrendous and fills me with shame.