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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.
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Unknown unknowns are the best to learn.
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What about the negative index? Does he use only .abs values in the fetch method?
I didn't answer with Math.floor but now that I see it I think it fits the spirit of the kata better. Nice job!