IIFE - Encapsulation Reference

IIFE - Encapsulation Reference.markdown

IIFE - Encapsulation Reference

A Pen by Dustin Rea on CodePen.

License.

script.js

/**
* IIFE vs NFE
* -----------------------------------
* The Demo Below can easily be switched between
*   a Self Invoking Function Expression and a
*   Named Function Expression.
*
* Immediately Invoking Function Expression
* -----------------------------------
* (function() {}());
*
* Named Function Expression
* -----------------------------------
* var app = (function() {}());
* Add init function to app service.
* Usage: app.init(); || app.method();
* -----------------------------------
* @author: Dustin Rea
* -----------------------------------
* TODO: Experiment with using this
* -----------------------------------
*/
(function() {
	'use strict';

	var error = null;
	var name = 'Jankular';
	var user = {name: ''};

	// The Exposed Object Service
	var app = {
		logName: logName,
		setUserName: setUserName,
		logUserName: logUserName,
		getUser: getUser // Only Exposed for Testing

	};

	// --- PUBLIC ENCAPSULATED SERVICE ---

	// Return a Service to use Outside
	//return app; // Add init: init to app to Init outside.

	// Return app after init
	//return app;

	// --- PRIVATE ENCAPSULATION ---

	// Run Init with full encapsulation
	init();

	function init() {
		console.log('--- App Name ---');
		logName();
		console.log('--- User Object --- ');
		console.log(getUser());
		console.log('--- Setting Username: Type Error ---');
		setUserName(9999);
		logUserName();
		console.log('--- Updated User Object --- ');
		console.log(getUser());
		console.log('--- Setting Username: Success ---');
		setUserName('John Smith');
		logUserName();
		console.log('--- Updated User Object --- ');
		console.log(getUser());

		return app;
	}

	/////////////////////////////

	// Private Functions
	function log(input) {
		console.log(input);
	}

	function logError() {
		log(error);
		error = null;
		return;
	}

	function getName() {
		return name;
	}

	function getUser() {
		return user;
	}

	function getUserName() {
		return user.name;
	}

	// Public Functions
	function logName() {
		return log(getName());
	}

	function logUserName() {
		return log(getUserName());
	}

	// Sets the Username | Type Check for String
	function setUserName(name) {
		if(typeof name !== 'string') {
			error = 'Please Use Letters Only.';
			logError();
		} else {
			user.name = name;
		}
	}
}());


// For Named Function Expression
// var app = (function() {}());
// Add init function to app service.
//app.init();