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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.
what did the google tell you
update: it's an anonymous function -> can be implemented without being assigned to a name
Could someone help explain to me what "lambda" does???