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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.
there's no need for it, just makes it slightly easier to read for less experienced coders.
forEach is slow by design, is that really something we want to proliferate as a best practice?