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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.
I was feeling clever for using the sum of numbers formula and eliminating the need for an iterative method, but damn that's slick.
I appreciate how concise the code is, but mutating function parameters is bad practice, no?