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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <p id="hello">Hello World</p>
</body>
</html>
 
Object.prototype.GetSetProperty = function(name, value, loadFunction, index) {
  if (!this.Properties)
  {
    this.Properties = {};
  }
  
  if (typeof index === "number" && this.Properties[name] && this.Properties[name].constructor == Array)
  {
    return this.GetSetArrayProperty(name, index, value, loadFunction);
  }
  else 
  {
    value = index;
  }
  
  if (value)
  {
    this.Properties[name] = value;
  }
  else
  {    
    if (!this.Properties[name] && loadFunction)
    {
      this.Properties[name] = loadFunction();
    }
    
    return this.Properties[name]; // This will return "undefined" if property doesn't exist or the loadFunction wasn't provided.
  }
};
​
​
Object.prototype.GetSetArrayProperty = function(name, index, value, loadFunction) {
  if (value)
  {
    this.Properties[name][index] = value;
  }
  else
  {
    if (!this.Properties[name][index] && loadFunction)
    {
      this.Properties[name][index] = loadFunction();
    }
    
    return this.Properties[name][index];
  }
};
​
​
// Here's a nifty function that declares the properties for you.
Function.prototype.CreateProperty = function(propertyName, loadFunction) {
  eval("this.prototype['" + propertyName.toString() + "'] = function(i, v) { return this.GetSetProperty('" + propertyName.toString() + "', v, " + eval(loadFunction) + ", i); };");
};
​
​
​
​
var myFunctionThatDoesLazyLoading = function() {
  return "Ahoy!";
};
​
​
var MyClass = function() { }; // MyClass constructor.
MyClass.prototype.PageSize = function(i, v) { return this.GetSetProperty("PageSize", v, myFunctionThatDoesLazyLoading, i); };
​
var instance = new MyClass();
alert(instance.PageSize()); // PageSize is lazy loaded.
​
instance.PageSize(5); // PageSize is re-assigned.
alert(instance.PageSize()); // Returns the new value.
​
instance.PageSize([1, 2, 3]); // PageSize is re-assigned to have an Array value.
alert(instance.PageSize(2)); // Returns the value at index 2 of the Array value.
​
instance.PageSize(2, "foo"); // Re-assigns the value at index 2.
alert(instance.PageSize(2)); // Returns the new value at index 2.
​
MyClass.CreateProperty("NewProp", function() { return ["a", "b", "c"]; }); // Demo of the CreateProperty function.
alert(instance.NewProp());
alert(instance.NewProp(1));
​
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