Creating Namespaces in javascript

namespace.js

(function() {
	"use strict";
  	this.myapp = function(namespaceString, parentObj, delimiter) {
        var d, f, e;
        parentObj = parentObj || myapp || this;
        namespaceString = namespaceString.split(delimiter || ".");
        d = 0;
        for (f = namespaceString.length; d < f; d++)
        { 
        	delimiter = namespaceString[d],
        	parentObj = parentObj[delimiter] = parentObj[delimiter] || {},
        	"object" === typeof parentObj && (e = parentObj);
        }
        "function" === typeof parentObj && e && (parentObj = parentObj.bind(e));
        return parentObj;
    };
  }.call(this));
  
// // How To use 
//	myapp("world.asia.india");
// 	myapp("africa", myapp.world);
// 	myapp("europe-england", myapp.world,"-");
// 	myapp("world-africa-kenya", undefined ,"-");
//	console.log(myapp.world);