Javascript: Composition Example

composition.js

// Javascript Composition
function compose(a,b){ 
  return function(c){
    return a(b(c));
  };
}

function addIt(num) { 
  return num + num;
}
function multiplyIt(num) {
  return num * num;
}

var numbers = compose(addIt, multiplyIt);
console.log(numbers(3));

// 18