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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.
This is great. Would you mind explaining to me how this works? More specifically, I'm looking at the 'return index if yield item'. So I get the 'return index' part, but 'yield item' is what's tripping me up. You're saying 'yield' or stop if 'item' shows up?