modulepattern.js

var MYGLOBAL = (function () {
  var that = {},
      privateVariable = 2;

  function privateFunction() {
    //...
  }

  that.publicFunction = function () {
     //
  };

  that.publicProperty = 1;

  return that;
}());

MYGLOBAL.publicFunction();
MYGLOBAL.publicProperty = 10;
// etc.