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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.
Agreed. I was having it edit the array in-place like the JS .sort() and my tests passed but the "submit" tests failed. It took me a minute to figure out why.