Confused about javascript function returning multiple functions with many fat arrow

Question

I have problem with my cs homework. I need to access the x value of the function, but my codes is returning me an empty function instead of with the values

Answer 1

my console keeps returning me this instead

function(a,b){return a;}

Let's make this easier to read. In ES5, your code looks like this:

var pair = function(x, y) {
  return function(f) {
    return f(x, y);
  }
};

var head = function(p) {
  return function(a, b) {
    return a;
  }
};

You need to pass the function returned from head to the function returned by pair(1, 2). So you need to swap which order you're calling the functions in:

console.log(pair(1, 2)(head()));