...it helps you spot accidental complexity...Being able to spot and extract
    such boilerplate can radically improve the clarity of your code.

I think a second version of this tutorial in CoffeeScript would really shine a light on how CS is the best of JavaScript. Monads and FP are a breeze -- practically encouraged -- in CoffeeScript. It really removes the cruft of JS syntax and lets me focus on well-designed code, and I've found myself using similar patterns since I switched to CS. I code faster and (contrary to what I expected) debugging is much easier.