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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.
It's meant to be simple, as this was design for someone who is starting to learn javascript, so they will not even know array methods, of course for someone who already know javascript beter will solve this really easy.