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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.
Trivial map/filter/reduce is not a novel kata idea.
Codewars Forums - Kata Best Practices - Have Full Code Coverage
Having only 5 fixed assertions in your entire test suite is unacceptable as it easily allows logically flawed and/or hardcoded solutions to pass. Please either (1) increase the number of unique, distinct fixed assertions to at least 20 including edge cases or (2) even better, add 100+ random assertions as per standard Codewars practice and is generally favored over just 20+ fixed assertions.
Duplicate of https://www.codewars.com/kata/anagram-detection
Unfortunately, just like the kata name, finding duplicate elements in an array has already been done to death.
So it's pretty much a duplicate :(
Missing random tests.