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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.
This one is not safe as it will mutate the array coming in (it is not a pure function). It is better to spread it into a new array and return the first item in that array and leave the original one untouched.