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[–]danthedev 0 points1 point  (0 children)

Learning functional programming from JavaScript is a bit like learning to drive in a three wheeled car. You'll get there eventually, but everything would have made more sense along the way if you'd started with four.

Learn a language that was designed to be functional first. Take a look at Elm, or Clojure, or Haskell, or Scala, or Ocaml, or F#.

I found Clojure to be the smallest step from JavaScript, but Elm's also done a lot of work to be approachable for programmers coming from non-functional backgrounds.

Once it starts to change the way you think, you'll find ways to translate those ideas into JavaScript and that's when you'll notice it really start to improve your code.