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

You could change head function like this:

const pair = (x, y) => f => f(x, y); 
const head = f => f(a => a)

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