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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.
Why do you have a zero at the end of the callback function?
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I am new to this syntax. What is does the .filter do and what does v => mean?