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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 is irrelevant. We are interested in undamaged arrows, it doesn't matter if there are damaged ones and it isn't checked.
Thats beautiful, but I don't understand how it passess empty array test. What should I read about to fully understand that solution?
I read it as: "Return true, if some of 'a' dosen't have 'damaged' value. " Empty array dosen't have damaged, so why isn't it truthy?