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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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Tests in javascript are fine, this is no way of raising an issue. Please read this: https://docs.codewars.com/training/troubleshooting/
Some problem in the automatic test generation in javascript version, same code failed and passed in the next attemprs.