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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.
With a quick glance at the function and parameter name, is it not obvious that the function takes a year and returns the century it is in?
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Why do you say not best practice?
Came here to report the same.