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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.
check this please : https://docs.codewars.com/training/troubleshooting#your-solution-seems-to-work-or-is-close-to-working-but-still-fails-tests
My code run correctly in ChromeDev Tools, but when I tested it here it giving me an error.