oop - Javascript: Assigning a Private Method to Private Variable -

so i'm having javascript issues. i'm not pro, , don't understand why not work. trying assign private variable return value of private function. if set var xxx=function name() execute function when reference xxx. here code. note - var username=getsessionuser(); below.

//namespace var sessioncontrols=sessioncontrols || {}; sessioncontrols.app=sessioncontrols.app || {};   sessioncontrols.app.user = (function () { // defined within local scope  //private variable var username=getsessionuser();  //privatemethod var getsessionuser=function(){var mname='my name'; return mname;}    //private property & method example var privatemethod1 = function () { alert("private method 1"); } var privatemethod2 = function () { alert("private method 2");}  var privateproperty1 = 'foobar'; return {             //public method & nested namespace examples     //public methods     publicmethod1: privatemethod1,     //nested namespace public properties     properties:{         publicproperty1: privateproperty1,         sessionname:username     },     //another nested namespace     utils:{         publicmethod2: privatemethod2     }   } })(); 

this how called in routine.

var name=sessioncontrols.app.user.properties.sessionname; alert(name);     

why doesn't work?

you've got simple ordering problem:

var username=getsessionuser();  //privatemethod var getsessionuser=function(){var mname='my name'; return mname;}   

javascript won't complain undefined variable reference, because treats var statements in function if appeared @ start of code. however, initializations in var statements carried out in sequence appear.

thus, @ point code attempts initialize username, variable getsessionuser not defined.

if re-order 2 statements function defined first, part @ least work.

alternatively, define function function declaration statement:

function getsessionuser() {   var mname = "my name";   return mname; } 

then code work if leave initialization of username before function, because function declarations "hoisted" implicitly start of function.