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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.
True, but this was probably a really old answer. That's why I think Codewars shouldn't obfuscate dates. I don't know how exactly, but I'm sure there's a way to solve the issue of really outdated answers (that were great at the time) being presented as best practices to beginners especially in JS and Python katas.