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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.
Just passed this kata in JS, I can confirm it expects you to return
''for no result. As you can see from the output, your solution returns'none'instead.I'm marking this issue as resolved, since it's definitely not a kata issue.
What language are you using?
Generally,
''(empty string) andnullorNone(a special object that defines no value at all) are not equal.