Write a TWICE, function that takes a binary function and returns a unitary function that passes its arguments to the binary function twice Example var double = twice(add); double(11); // 22 var square = twice(mul); square(11); // 121

exercise_8.js

var add = (function(a) {
  return function(b) {
    return a + b;
  }
});
var mul = (function(a) {
  return function(b) {
    var total = a * b;
    return total;
  }
});

function twice(func){
	return function(d){
  	return func(d)(d);
  }
}
var double = twice(add);
console.log(double(11)); // 22
var square = twice(mul);
console.log(square(11)); // 121