On the topic of functional JavaScript, a few interesting articles and books I have been reading that have helped shed more light on this subject matter. I particularly enjoyed the Functional JavaScript book [2].

[1] - http://www.cse.chalmers.se/~rjmh/Papers/whyfp.pdf

[2] - http://shop.oreilly.com/product/0636920028857.do

[3] - http://stackoverflow.com/questions/36504/why-functional-lang...

[4] - http://scott.sauyet.com/Javascript/Talk/2014/01/FuncProgTalk...