//Knowing that we have access to whatever
//the user inputs into our function expression, we then write...
return function(){
     var key = JSON.stringify(arguments);
     if (cash[key]){
      return cache[key];
     }

    else{
      //apply() comes in handy here and will simply
      //return the value of the function it calls
      val = func.apply(this, arguments);
      //then we set the value of the function to the key(argument).
      //The next time the function runs,
      //if the argument is the same, we simply return
      //the value without having to have the function execute.
      cash[key] = val;
      return val;
    }
}