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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.
That's a problem with your code. Print the input and debug it. Or add this test to sample tests and see your code fail:
There is no problem with the tests:
No, there is no problem in random tests in javascript. That's your code's problem, read this: https://docs.codewars.com/training/troubleshooting/