reduce() is how you get imperative programming in a functional setting. JS is a perfectly good imperative language; for all these examples, you may as well use

reduce() is how you get imperative programming in a functional setting. JS is a perfectly good imperative language; for all these examples, you may as well use a for loop. Personally I prefer a functional style, but if you're going to use an imperative style, just use JS's built-in imperative for loop and assignment operators.