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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.
I am baffled. Why are submission for JS with ECMA6 considered best practice? Even on MDN there are many TBD sections, it was finalized in June 2015. IE doesn't support it, Android support is ... probably nonexistent. Do you precompile JavaScript before deploying or what?