Yeah, I'm pretty amazed at the amount of attention that a simple "fold"[1] gets in JS-land.

Yeah, OK, Redux (etc.) is also a little bit of a pattern for sort-of-algebraic data types, but really... I prefer using a language that actually supports algebraic data types natively like Scala.js, Reason, Bucklescript, js_of_ocaml or GHCJS.

I appreciate that these may not be an option for everyone, but at least one of them should be an option for the vast majority of current frontend developers.

[1] Well, technically I guess it would be a foldM?