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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 guess it's the overflow considerations?
what is meant with the "worst case" ?
This is the answer I needed.
If the goal is to pass the test, that's fine. But this code cannot be considered best practice because it does not consider the worst case.