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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.
Use Ruby 2.0 on the backend and we can use Enumerable#lazy to fix that. ;)
Except that yours (and mine) runs in O(n) time, whereas all these other solutions using #sort run in O(n lg n).