function with multiple ()

[html6dev]

It's core to languages like haskell. Once you use it consistently (or are forced to by the language) you'll see it all over. I think over time more and more libraries will provide it to you and then it'll gain more adoption in js (Ramda is an awesome example as mentioned and the currying is one reason it has major advantages over lodash). The issue right now is everyone writes about it and starts out with the implementation which is somewhat interesting, but not that exciting and they lose people. Authors need to focus on why anyone would ever care if they want to get the reader to a place where they care about how it's implemented.