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Home > Programming > Object Oriented Programming > Mastering JavaScript Object-Oriented Programming
Mastering JavaScript Object-Oriented Programming
Mastering JavaScript Object-Oriented Programming

Mastering JavaScript Object-Oriented Programming: Advanced patterns, faster techniques, higher quality code

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Mastering JavaScript Object-Oriented Programming

Chapter 2. Diving into OOP Principles

In the previous chapter, we introduced objects and their basic use in JavaScript. We have seen that objects have a key role in the language, but many developers consider JavaScript's approach to object management simple compared with the object management of Java, C#, and other OOP languages.

In fact, a common misunderstanding concerns the Object-Oriented nature of JavaScript. Many developers do not consider JavaScript as a true Object-Oriented language, but just a language with an outlandish use of objects.

In this chapter, we will discuss  the OOP nature of JavaScript by showing that it complies with the OOP principles. It also will explain the main differences with classical OOP. The following topics will be addressed in the chapter:

  • What are the principles of the OOP paradigm?
  • Support of abstraction and modeling
  • How JavaScript implements Aggregation, Association, and Composition
  • The Encapsulation principle in JavaScript...

OOP principles

OOP is one of the most popular programming paradigms. Many developers use languages based on this programming model such as C++, Java, C#, Smalltalk, Objective-C, and many other. One of the keys to the success of this programming approach is that it promotes a modular design and code reuse—two important features when developing complex software.

However, the OOP paradigm is not based on a formal standard specification. There is not a technical document that defines what OOP is and what it is not. The OOP definition is mainly based on common sense taken from the papers published by early researchers as Kristen Nygaard, Alan Kays, William Cook, and others.

Note

An interesting discussion about various attempts to define OOP can be found online at the following URL:http://c2.com/cgi/wiki?DefinitionsForOo

Anyway, a widely accepted definition to classify a programming language such as Object Oriented is based on two requirements-its capability to model a...

Is JavaScript Object Oriented?

Once we have established the principles commonly accepted for defining a language as Object Oriented, can we affirm that JavaScript is an OOP language? Many developers do not consider JavaScript a true object-oriented language due to its lack of class concept and because it does not enforce compliance with OOP principles.

However, we can see that our informal definition make no explicit reference to classes. Features and principles are required for objects. Classes are not a real requirement, but they are sometimes a convenient way to abstract sets of objects with common properties. So, a language can be Object Oriented if it supports objects even without classes, as in JavaScript.

Moreover, the OOP principles required for a language are intended to be supported. They should not be mandatory in order to do programming in a language. The developer can choose to use constructs that allow him to create Object Oriented code or not. Many criticize JavaScript because...

Abstraction and modeling support

The first requirement for us to consider a language as Object Oriented is its support to model a problem through objects. We already know that JavaScript supports objects, but here we should determine whether they are supported in order to be able to model reality.

In fact, in Object-Oriented Programming we try to model real-world entities and processes and represent them in our software. We need a model because it is a simplification of reality, it allows us to reduce the complexity offering a vision from a particular perspective and helps us to reason about a relationship among entities.

This simplification feature is usually known as abstraction, and it is sometimes considered one of the principles of OOP. Abstraction is the concept of moving the focus from the details and concrete implementation of things to the features that are relevant for a specific purpose, with a more general and abstract approach. In other words, abstraction is the capability to...

OOP principles support

The second requirement that allows us to consider JavaScript as an Object-Oriented language involves the support of at least three principles—encapsulation, inheritance, and polymorphism. Let analyze how JavaScript supports each of these principles.

Encapsulation

Objects are central to the Object-Oriented Programming model, and they represent the typical expression of encapsulation, that is, the ability to concentrate in one entity both data (properties) and functions (methods), hiding the internal details.

In other words, the encapsulation principle allows an object to expose just what is needed to use it, hiding the complexity of its implementation. This is a very powerful principle, often found in the real world that allows us to use an object without knowing how it internally works. Consider for instance how we drive cars. We need just to know how to speed up, brake, and change direction. We do not need to know how the car works in detail, how its motor burns...

JavaScript OOP versus classical OOP

The discussion conducted so far shows how JavaScript supports the fundamental OOP principles and can be considered a true OOP language as many others. However, JavaScript differs from most other languages for certain specific features which can create some concern to the developers used to working with programming languages that implement the classical OOP.

The first of these features is the dynamic nature of the language both in data type management and object creation. Since data types are dynamically evaluated, some features of OOP, such as polymorphism, are implicitly supported. Moreover, the ability to change an object structure at runtime breaks the common sense that binds an object to a more abstract entity such as a class.

The lack of the concept of class is another big difference with the classical OOP. Of course, we are talking about the class generalization, nothing to do with the class construct introduced by ES6 that represents just a...

OOP principles

OOP is one of the most popular programming paradigms. Many developers use languages based on this programming model such as C++, Java, C#, Smalltalk, Objective-C, and many other. One of the keys to the success of this programming approach is that it promotes a modular design and code reuse—two important features when developing complex software.

However, the OOP paradigm is not based on a formal standard specification. There is not a technical document that defines what OOP is and what it is not. The OOP definition is mainly based on common sense taken from the papers published by early researchers as Kristen Nygaard, Alan Kays, William Cook, and others.

Note

An interesting discussion about various attempts to define OOP can be found online at the following URL:http://c2.com/cgi/wiki?DefinitionsForOo

Anyway, a widely accepted definition to classify a programming language such as Object Oriented is based on two requirements-its capability to model a problem through objects and...

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Key benefits

  • Covering all the new Object-Oriented features introduced in ES6, this book shows you how to build large-scale web apps
  • Build apps that promote scalability, maintainability, and reusability
  • Learn popular Object-Oriented programming (OOP) principles and design patterns to build robust apps
  • Implement Object-Oriented concepts in a wide range of front-end architectures

Description

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.

Who is this book for?

This book is ideal for you if you are a JavaScript developers who wants to gain expertise in OOP with JavaScript to improve your web development skills and build professional quality web applications.

What you will learn

  • Master JavaScript s OOP features, including the one s provided by ES6 specification
  • Identify and apply the most common design patterns such as Singleton, Factory, Observer, Model-View-Controller, and Mediator Patterns
  • Understand the SOLID principles and their benefits
  • Use the acquired OOP knowledge to build robust and maintainable code
  • Design applications using a modular architecture based on SOLID principles

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 29, 2016
Length: 292 pages
Edition : 1st
Language : English
ISBN-13 : 9781785888267
Category :
Programming
Languages :
JavaScript
Concepts :
Object Oriented Programming

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Publication date : Jun 29, 2016
Length: 292 pages
Edition : 1st
Language : English
ISBN-13 : 9781785888267
Category :
Programming
Languages :
JavaScript
Concepts :
Object Oriented Programming

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Table of Contents

12 Chapters
1. A Refresher of Objects Chevron down icon Chevron up icon
1. A Refresher of Objects
Object literals
Object constructors
Object prototypes
Using classes
Summary
2. Diving into OOP Principles Chevron down icon Chevron up icon
2. Diving into OOP Principles
OOP principles
Is JavaScript Object Oriented?
Abstraction and modeling support
OOP principles support
JavaScript OOP versus classical OOP
Summary
3. Working with Encapsulation and Information Hiding Chevron down icon Chevron up icon
3. Working with Encapsulation and Information Hiding
Encapsulation and information hiding
Convention-based approach
Privacy levels using closure
A meta-closure approach
Property descriptors
Information hiding in ES6 classes
Summary
4. Inheriting and Creating Mixins Chevron down icon Chevron up icon
4. Inheriting and Creating Mixins
Why inheritance?
Objects and prototypes
ES6 inheritance
Controlling inheritance
Implementing multiple inheritance
Creating and using mixins
Summary
5. Defining Contracts with Duck Typing Chevron down icon Chevron up icon
5. Defining Contracts with Duck Typing
Managing dynamic typing
Contracts and interfaces
Duck typing
Duck typing and polymorphism
Summary
6. Advanced Object Creation Chevron down icon Chevron up icon
6. Advanced Object Creation
Creating objects
Design patterns and object creation
Creating a singleton
An object factory
The builder pattern
Comparing factory and builder patterns
Recycling objects with an object pool
Summary
7. Presenting Data to the User Chevron down icon Chevron up icon
7. Presenting Data to the User
Managing user interfaces
Presentation patterns
The Model-View-Controller pattern
The Model-View-Presenter pattern
The Model-View-ViewModel pattern
A MV* pattern comparison
Summary
8. Data Binding Chevron down icon Chevron up icon
8. Data Binding
What is data binding?
Implementing data binding
The publish/subscribe pattern
Using proxies
Summary
9. Asynchronous Programming and Promises Chevron down icon Chevron up icon
9. Asynchronous Programming and Promises
Is JavaScript asynchronous?
Writing asynchronous code
Introducing Promises
Using Generators
Summary
10. Organizing Code Chevron down icon Chevron up icon
10. Organizing Code
The global scope
Creating namespaces
The module pattern
Module loading
ECMAScript 6 modules
Summary
11. SOLID Principles Chevron down icon Chevron up icon
11. SOLID Principles
Principle of OOP design
The Single Responsibility Principle
The Open/Closed Principle
The Liskov Substitution Principle
The Interface Segregation Principle
The Dependency Inversion Principle
Summary
12. Modern Application Architectures Chevron down icon Chevron up icon
12. Modern Application Architectures
From scripts to applications
From old-style to Single Page Applications
The Zakas/Osmani architecture
Cross-cutting features and AOP
Isomorphic applications
Summary

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Michael Sankovich Jan 27, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
A great read for getting into the OO sides of web dev
Amazon Verified review Amazon
Amazon Customer Jul 20, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book, I would definitely recommend it to anyone who wants to improve his or her OOP Javascript skills, and move to the next level of Javascript language skills. It cowers all the main subjects, beginning from OOP basics, prototypical inheritance, polymorphism inheritance and encapsulation JS implementation, and ending with Object Oriented Design principles, and design patterns. It will definitely provide you with solid foundation for your JS development and help you answer all hard JS OOP interview questions. It does not relay on any library and teaches how to write OOP Javascript code with no dependency on anything else but pure JS language. Reading this book was a great source of insights for me personally, Would definitely recommend!
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Sung H. Byun Jun 08, 2017
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I had some OO javascript experience before I picked up this book. But this book really opened my eyes wide. Very through but incrementally explaining OO in javascript.
Amazon Verified review Amazon
sapo Aug 11, 2016
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Really usefull and complete!
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Dario Chini Sep 13, 2016
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The book is truly complete. It is useful not only for those not familiar with Object Oriented Design principles, but also for those who may want to go over the described methodologies in the future. It is strongly recommended for those who do not have a structured course on JavaScript, or those who need to improve OOP especially on considerable codebases.Theory and practice are well balanced with complete examples. The book reads easily.We bought more than 20 copies for developers for their professional growth and to unify their theoretical basis.
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About the author

Profile icon Andrea Chiarelli
Andrea Chiarelli
Andrea Chiarelli has over 20 years experience as a software engineer and technical writer. In his professional career, he has used various technologies for the projects he has been involved in: from C# to JavaScript, from Angular to React, from ASP.NET to PhoneGap/Cordova. He has contributed to many online and offline magazines and has been the author of a few books published by Wrox Press and Packt. Currently, he is a senior software engineer at the Italian office of Apparound, Inc. and a regular contributor to HTML.it, an Italian online magazine focused on web technologies. You can follow him on Twitter at @andychiare.
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