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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.
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For the time being, yes, that's the newest version available. There are plans to upgrade to 3.0, but I can't tell you when: https://github.com/codewars/runner/issues/7
Oh I see. So all katas on Codewars use Ruby 2.5.0? I did not realize that and was scratching my head on this one.
Thanks for the tip, that helps!
Because it doesn't exist in 2.5.0: https://ruby-doc.org/core-2.5.0/Array.html
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