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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.
It's clever to remember about negative values, also you could simple use !isEven, to include them automatically.
Why not? I would make them inline though. But i'm pretty sure that compiler will optimise it as inline functions
I really don't think you should make two extra functions for determining if an integer is even or odd.