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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.
Generally you'd want to avoid recursion in JS since it functions by adding additional calls to the callstack and that can cause a crash if the input is large enough. As far as writing production code goes I've only ever used recursion a couple of times to traverse tree like structures. Hope this helps!