Book Image

Mastering JavaScript Object-Oriented Programming

Book Image

Mastering JavaScript Object-Oriented Programming

Overview of this book

ECMAScript 6 introduces several new Object-Oriented features that drastically change the way developers structure their projects. Web developers now have some advanced OOP functionality at their disposal to build large-scale applications in JavaScript. With this book, we'll provide you with a comprehensive overview of OOP principles in JavaScript and how they can be implemented to build sophisticated web applications. Kicking off with a subtle refresher on objects, we'll show you how easy it is to define objects with the new ES6 classes. From there, we'll fly you through some essential OOP principles, forming a base for you to get hands-on with encapsulation. You'll get to work with the different methods of inheritance and we'll show you how to avoid using inheritance with Duck Typing. From there, we'll move on to some advanced patterns for object creation and you'll get a strong idea of how to use interesting patterns to present data to users and to bind data. We'll use the famous promises to work with asynchronous processes and will give you some tips on how to organize your code effectively. You'll find out how to create robust code using SOLID principles and finally, we'll show you how to clearly define the goals of your application architecture to get better, smarter, and more effective coding. This book is your one-way ticket to becoming a JavaScript Jedi who can be counted on to deliver flexible and maintainable code.
Table of Contents (18 chapters)
Mastering JavaScript Object-Oriented Programming
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

A meta-closure approach


The basic idea of the previous approach builds on the nature of closure. The constructor's environment is protected by default and remains accessible from the inside of the constructor itself even after it terminates. However, since the closure is created when the constructor is called, each object instance needs to have both private data and privileged methods defined inside the constructor context. An ideal solution should be one that protects private data letting them be accessible from outside the constructor's closure. This should be a sort of meta-closure that offers an extra level of protection-a closure accessible from outside the object constructor by prototype members still hiding private data of the resulting object. This meta—closure can be built using an Immediately Invoked Function Expression (IIFE).

Immediately invoked function expressions

An IIFE, also called a self-executing anonymous function, is a JavaScript expression involving an anonymous function...