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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.
Definitely a great balance between readability and performance - I saw another example of this using single character variable / function names and it was very difficult to grok at a glance.