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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.
The tests cases are fine; the problem is that your code is incorrect. it has to work for any number, not just the ones you see in the sample tests
please specify the language you're using when you ask for help. i'm guessing this is JavaScript.
the logs mean that your code is correct for 13 ('d' in hexadecimal), but not for 2 (10 in binary)