Creating the MongoDB URL in a Node web app on AppFog

gistfile1.js

// This is my refactored version of the code available in AppFog’s documentation here: 
// https://docs.appfog.com/services/mongodb#node

// The version string is passed to the IIFE as an argument ('mongodb2-2.4.8' in my case)

var mongourl = (function (mongo_version) {
	var VCAP = process.env.VCAP_SERVICES; 
	var obj = VCAP ? JSON.parse(VCAP)[mongo_version][0].credentials : {};
	
	return [
		'mongodb://',
		(obj.username && obj.password) ? (obj.username + ':' + obj.password + '@') : '',
		obj.hostname || 'localhost', ':', obj.port || 27017, '/', obj.db || 'test'
	].join('');
}('mongodb2-2.4.8'));