I like what you are doing here. Since I've been introduced to Haskell, I wondered about functional programming in JavaScript. To my surprise, JavaScript is versatile enough to support a lot of functional concepts!
All these languages have a similar enough semantic core which if you remove assignments and use mostly closures/hof you end up with a syntactically heavy[1] untyped ML (sic). {Coffee,Live}script comes to mind.
[1] remove return, curly braces .. with ES6 unpacking/pseudo-pattern-matching and let, you're half way there.
I can recommend flicking through https://leanpub.com/javascript-allonge/read -- it's a really good book on functional programming in JS. Ends up doing Ycombinators, trampolining etc.