javascript - Factory unable to create objects defined within an IIFE object -

i'm creating gallery transitions slides based on various transition objects:

window.mygallery = (function () { var instance = null;     ....  //base transition function transition(slide, settings){     this.slide = slide;     this.el = slide.el;     this.settings = settings;     this.duration = (this.settings['transitionspeed'] / 1000) + 's';     this.endanimation = null; }  //fade transition function fadetransition(slide, settings){     transition.call(this, slide, settings); } fadetransition.prototype = object.create(transition.prototype); fadetransition.prototype.constructor = fadetransition;  //slide transition function slidetransition(slide, settings){     transition.call(this, slide, settings); } slidetransition.prototype = object.create(transition.prototype); slidetransition.prototype.constructor = slidetransition; 

to appropriate transition object, built factory:

 var transitionfactory = function () {     return {         createtransition: function (slide, transitiontype, settings) {             if (transitiontype) {                 type = transitiontype;             }             if (type == 'fade') {                 return new fadetransition(slide, settings);             }             else if(type == 'slide'){                 return new slidetransition(slide, settings);             }          },         //set default transition         type: "fade"     }; }; 

since envision dozens of different transitions, thought clever , take in string create transition object dynamically:

 createtransition: function (slide, transitiontype, settings) {             if (transitiontype) {                 type = transitiontype;             }             type = type.charat(0).touppercase() + type.slice(1);             type += 'transition';             if(typeof window[type] != 'undefined') //boom                 return new window[type](slide, settings);             else                 return new fadetransition(slide, settings);          }, 

the issue fadetransition defined within iife assigned window.mygallery, since don't want pollute global scope objects. therefore, undefined:

   if(typeof window[type] != 'undefined') 

how can test existence of object within iife scope , instantiate if exist?

i not sure if inner functions can accessed in iife, if it, have added functions in object, based on user's input have picked function object. here sample implementation.

var mygallery = (function() {     var instance = null;      //note: base transition function goes here      function inheriter(child, parent) {         child.prototype = object.create((parent || transition).prototype);         child.prototype.constructor = child;     }      var transitions = {         fadetransition: function(slide, settings) {             transition.call(this, slide, settings);         },         slidetransition: function(slide, settings) {             transition.call(this, slide, settings);         }     };      (var transition in transitions) {         inheriter(transitions[transition], transition);     }      return {         createtransition: function(slide, transitiontype, settings) {             type = (transitiontype || "fade") + "transition";             type = type.charat(0).touppercase() + type.slice(1);             if (!transitions[type]) {                 type = "fadetransition";             }             return new transitions[type](slide, settings);         }     };  })();