I don't think the author's goal is to recreate Haskell in Javascript. There's appeal for JS devs like myself to learn / use Haskell paradigms like those you've

I don't think the author's goal is to recreate Haskell in Javascript. There's appeal for JS devs like myself to learn / use Haskell paradigms like those you've mentioned in their codebases without having to learn a whole new language.