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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.
Thank you for the constructive feedback! I've had some struggles deciding how best to handle return points in conditional-based functions, reframing it as "what output do I want?" makes a lot of sense.
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Definitely not a 6 kyu in PHP, but I had fun. I wonder if it's harder in other languages?
The description is pretty difficult to get through as non-visualizer since 'rotate left' actually means moving a particular digit to the end, the right. But easy to implement once understood.