sean-roberts

//start with a string literal
var a = "Hello, World";

//add a new property to that string
a.dateCreated = "6-4-2013";

//try to access that property
var b = a.dateCreated;

//b is still undefined

sean-roberts

//version without passing in parameters that are not available in the function scope
;(function(){
  
  //code here
  
  //why the leading semi colon?
  // this is a safe way to keep from having conflicts with other code that uses the same
  // self invoking functions but left off the colon
  
})();