/*
Closures cannot access the arguments object of the parent, 
but, because functions are first class objects, we can pass a function as a parameter. 
The closure can now access the arguments object of the function that is passesd as a parameter.
So, there is no confusion as to which arguments object we want the closure to access. 
We're basically taking advantage of its limitations
*/
function demoMemo(func){
//we must return a function in order to keep state
//this will be more apparant in a recursive example

  return function () {
    console.log(func); // >   function (num){num + num}
    console.log(arguments[0]); // > 1
  }
}

// Our function expression here calls demoMemo and passes it an anonymous function. 
var adder = demoMemo(function(num){
 num + num;
}) 

//Once that is passed, as you can see, when we call our function expression, 
//we have access to all the properties of the function we want to memoize 

adder(1);