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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.
Just realised that you did in one line too. Sorry man. In your case you at least don't have curly braces, it's kinda makes sense... Maybe
Not even that... The logic is written in freaking one line... I wonder what classes he writes...
I am not sure this one is "Best Practice" from performance standpoint.