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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.
i dont see anything in the sample tests. this is an old kata with many issues in JS, it has no sample tests, no random tests, and uses the old Codewars framework. are you sure you did not add those sample tests yourself ? (perhaps long ago; Codewars caches your code and the sample tests unless you click on RESET)
that's because you renamed the function. it's supposed to be called
toUnderscore
.