dojo - How to define a class just contains all constants variable? -

how can define class contains constants variable? late can refer constants other classes constants.car value("blue car") defined in constatns class. let say: car = "blue car" in constants class.

i've been working slightly-over-engineered solution because i'm little paranoid about:

1. someone changing constants accident , screwing lot of stuff
2. someone trying access nonexistent constant , not getting obvious error

so constant module looks like:

define(["dojo/_base/lang"], function(lang){      // variable private, never directly exposed outside world     var constants  = {         foo : "alpha",         bar : "beta"     };      // if name of constant given, return associated variable.     // if not, return constants, return copy potential     // damage limited.     return function(cname){         if(typeof cname == "undefined"){             // copy of our protected object             return lang.clone(constants);         }else{             // value of particular thing                         if(constants.hasownproperty(cname)){                 return constants[cname];             }else{                 throw "constant '"+cname+"' not exist.";             }         }     };  }); 

to use constants, go:

require(["package/my/constants"],function(myconstants){     var x = myconstants("foo"); // should "alpha"     var y = myconstants(); // should {foo:"alpha",bar:"beta"} } 

given it's javascript, there's way subvert this, resistant against common mistakes.