Isolate this referance in javascript -

i trying work out style of javascript modular coding.

currently have "mount variable" declared in global.js linked pages in web application. contains global site stuff, javascript language switching:

var app = window.app || {};  app.lang = (function ($) {     "use strict";      var init = function () {        ...         };     };      return { init: init }; })($);  app.globallogic = (function ($) {     "use strict";      var ready = $(function () {         app.lang.init();     }); }($)); 

as can see, using executed functions initialize logic loaded code in file.

now trying write isolated javascript file can have similar variable names other files loaded on same page. here example:

app.galleriesadminlogic = (function ($) {     "use strict";      var mountdivid = "#galleries-management-view";      ...      var constructorfunction = function () {          var initialdataobject = $.parsejson($(mountdivid + " #initial-galleries-list").val());        ... }($)); 

notice variable mountdivid. if there similar js file loaded @ same time, contain definition variable named mountdivid, create resolution conflict? correct pattern address same name variables local function?

variables declared inside functions local function. not visible other functions, , "hide" variables same name declared outside function.