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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 about JS. Issue already raised below => closing.
You should add more tests to validate or not the work we do,
i once passed your 4 tests but my function wasn't totally good, and it's just because i wanted to refactor and added a sample test i did myself that i saw that my code wasnt totally finished
thanks for reading