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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.
Please read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution I really have no idea what you're talking about. There are almost 39k solutions in javascript already.
Just checked. Nothing's wrong with the test case. Leading zeroes must still be kept