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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.
Node version has been updated to v12
You should be able to use it now :)
This kata is old, so the method is not available in said version.
Not a kata issue, read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#expected-the-same