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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.
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There's a lot of various Collatz sequence katas already: https://www.codewars.com/kata/search/my-languages?q=Collatz
There's nothing fundamentally different here...
Duplicate of this kata.
lack of random tests.
also, recommended reading : https://github.com/Codewars/codewars.com/wiki/Tutorial%3A-Create-Your-First-Kata