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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.
Hey Ricardo! Yeah I thought it was you. I just started codewars :) Thanks man. Hope you're doing good as well!
I think it means that if a 'Bag' object does not have any elements in it, then it should not blow up the tests. So your code should still work even for 'Bag' objects that happen to not have anything in it.