How can i make following Javascript code work?

Question

I am learning javascript.I stick to one problem. I want same function to generate same result for this code:

Multiply(5, 2); // return 10
Multiply(5)(2); // return 10

Answer 1

It would be what you want.

function Multiply(a, b){
  if(b != null){
    return a*b;
  }
  return function(c){
    return a*c;
  }
}

console.log(Multiply(5, 2));
console.log(Multiply(5)(2));