It's meant to be simple, as this was design for someone who is starting to learn javascript, so they will not even know array methods, of course for someone who already know javascript beter will solve this really easy.

This level of kata is for beginners who generally do not know the methods and need to exercise logic or learn to look for a suitable method, if you enjoy that it is very easy look for a kata 5.

• No random tests
• Trivial map/filter/reduce is not a novel kata idea