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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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I did the same loop and boolean tests on my first creation, which led me to try the reduce method, which led me to the sort method. I've curiously not seen much use of sort() on this kata.