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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.
Yes, definitely simpler. Not sure about more performant...maybe.
True, but sometimes performance is not always the goal. Sometimes simplicity and maintainability are also important.
Didn't realise you could change the method signature. I noticed some people (using recursion) changing the return type to long to avoid the cast to int when n < 10