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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.
This solution is at least 8 years old. Probably let or const weren't a thing when it was written.
I advise using const or let ao instead of var friend