If you're interested in FP in javascript, you should check out the relatively new Ramda.js [1]. It switches from the underscore style collection first call pattern to a collection last pattern and automatically curries its functions. The combination allows for easier function composition.

[1] https://github.com/CrossEye/ramda

More info on the topic:

http://fr.umio.us/why-ramda/

http://www.youtube.com/watch?v=m3svKOdZijA

https://speakerdeck.com/raganwald/javascript-combinators