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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.
Haha, I did the same and through breaking down my code line by line on CGPT it was mentioned the code actually evaluates to the last value 'u' due to the way the comma operator works in JavaScript but I didn't bother to do an array like you did.