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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.
Yeah, I've found that it's good practice to use those in functional programming, as they won't mutate the originalinputs/array
Big fan of thes use of new, keys, and the ternary conditional in this solution.