what Aaron said

gistfile1.txt

const getXYisWindy = getXYer(0.0137,9,0.0321,6);
const getXYhowWindy = getXYer(0.0691,9,0.0537,9);


so, those functions are just to get the X,Y where the answer to the question is.
you'll still need a function to evaluate them. something like.

curried functions take N arguments.  for N-1 or fewer arguments, they return a
function that takes the remaining arguments.  The classic example is add(a,b).  
If you call add(5), it returns a function that takes one parameter and adds 5 to it.

This isn't a true curried function, but it's what javascript uses for it.

True currying usually happens in languages that use more of a reverse polish notation, like Lisp or Clojure.
Anyway, this makes it easy to make getXY functions for different purposes.