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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.
Why would standard functions be prohibited?
Thank's. Your decision is shorter, but I was sure that using standart functions is prohibited )
Your solution is very interesting. I really over-thought the solution and never considered a.reduce... It will be interesting to learn more.