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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.
help please explain in english or breakdown if possible. I see your ternary operator however not sure about the [].reduce.call...and + f;...are s and f = '' two inputs into sub function?