Is Reduce() Bad?

n this episode, Jake and Surma discuss the array function reduce(). Is it good to use it? Is it too “smart”? Does it increase or decrease readability? PUBLICATION PERMISSIONS:
Original video was published with the Creative Commons Attribution license (reuse allowed) ATTRIBUTION CREDITS:
Original video source: https://www.youtube.com/watch?v=qaGjS7-qWzg https://www.youtube.com/watch?v=TnZ7jMFCa4Y