// we are prepending “private” variables with an underscore _
var MyExampleModule = function() {

 var _privateVar = “Hello”;

  return {
   getPrivateVar: function() {
     return _privateVar;
   },
   setPrivateVar: function(value) {
     _privateVar = value;
   }
  }

}

var myExampleModuleInstance = new MyExampleModule();

console.log(myExampleModuleInstance._privateVar); // logs undefined
console.log(myExampleModuleInstance.getPrivateVar()); // logs “Hello”