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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.
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Maybe give users some examples, or link to the wiki on factorials. You should probably also mention no negative numbers will be input (or if you want to complicate things - i.e. distinguish yourself from all the duplicates - tell users how they should be dealt with).
Your Kata (JavaScript version) needs more extensive test coverage to prevent easy cheap-cheat solutions and/or logically flawed solutions. The most common way to increase test coverage is through the inclusion of randomly generated test cases at runtime so please add these. The lack of test coverage in a Kata as an Issue is recognised as an official CW stance.
Duplicate of a duplicate of a duplicate... https://www.codewars.com/kata/search/my-languages?q=factorial