I mentioned Ramda without having used it very much and I didn't know about the frequent API changes. From my personal experience, I got very good results using

I mentioned Ramda without having used it very much and I didn't know about the frequent API changes. From my personal experience, I got very good results using LiveScript with its default Prelude.ls lib. LS supports nearly all FP-related constructs and syntax known from many other languages, and Prelude.ls, while smaller than Ramda, is quite complete, too. That's not for every project, though: introducing another language is a bigger risk than introducing a single library.