Javascritp module pattern

module.js

(function (window, document, undefined){
  'use strict';

  var App = (function () {
    var exports = {},
        module = {};

    module._privateVar = 'This is a private variable';
    module._privateMethod = function _privateMethod() {
      return 'This is a private method';
    };

    module.otherMethod = function otherMethod() {
      return 'This is a other method';
    };

    exports.otherMethod = module.otherMethod;
    exports.publicVar = 'This is a public variable';
    exports.publicMethod = function publicMethod() {
      return 'This is a public method';
    };

    return exports;
  })();

  window.App = App;
})(window, document);