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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.
If performance is a concern, it's still better to write the 'yield' expression. These are lazy gens and they're sometimes half as slow, but it's likely just splitting hairs unless you're working on exceptionally large sets of data.