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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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I might mention in the instructions that some new javascript object methods aren't interpreted correctly by babel on codewars -- but... you can paste in the polyfill from MDN (if available) to make it work.