Write two binary functions "add" and "mul", that take two numbers and return their sum and product

exercise_2.js

"use strict";
var add = (function(a){
 		return function (b){
       return a + b;
    }
});
var mul = (function(a){
	return function(b){
    var total = a * b;
   	return total;
  }	
});
console.log(add(1)(2));
console.log(mul(10)(2));