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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.
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Very clever use of arrow functions and destructuring.
Just a quick mention that this will only work in ES6 though, which might not always be available.
Too much text.