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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.
Agreed. I have multiple ways of doing this, which work correctly in console, kata fails every time.
MDN is not 'any' community wiki. They have credibility.
You didn't link to the JS docs. You linked to MDN, a community wiki.