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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.
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Too many unnecessary loops. Unefficient
This solution uses two loops (filter and sum) instead of one for loop in the traditional one. So yes, in the terms of performance this is definitely not the best solution.