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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.
You are correct james!
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Yes it is ! ;)
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I'm not an expert on the subject, but I imagine a sufficiently advanced compiler would recognize that a.sort.reverse returns the same result every time and cache the value.