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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.
Sometimes I am just wondering, how beautiful JavaScript is - and how many clever people are there. And at the same time, I am also happy that I do not have to maintain this kind of codes :D Hope you do not use this kind in production! Anyway, hats off for this math/algo skills :)
Excuse me but who upvotes this as a best practice :D