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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
Explore and master modern JavaScript techniques in order to build large-scale web applications
About This Book
- Write powerful code with the high-level functions that JavaScript offers
- Test and debug issues with JavaScript code using various modern mechanisms
- Offers an expert's eye on the latest ES6 features and how these advanced tasks fit together in JavaScript as a whole
Who This Book Is For
This book is ideal for web developers who are looking to master modern JavaScript concepts and design principles. You should already have an intermediate level of JavaScript knowledge before starting this book.
What You Will Learn
- Get a run through of the basic JavaScript language constructs
- Get familiar with the Functions and Closures of JavaScript
- Explore Regular Expressions in JavaScript
- Code using the powerful object-oriented feature in JavaScript
- Test and debug your code using JavaScript strategies
- Master DOM manipulation, cross-browser strategies, and ES6
- Understand the basic concurrency constructs in Javascript and best performance strategies
- Learn to build scalable server application in JavaScript using Node.js
In Detail
JavaScript is a high-level, dynamic, untyped, lightweight, and interpreted programming language. Along with HTML and CSS, it is one of the three essential technologies of World Wide Web content production, and is an open source and cross-platform technology. The majority of websites employ JavaScript, and it is well supported by all modern web browsers without plugins. However, the JavaScript landscape has changed dramatically in recent years, and you need to adapt to the new world of JavaScript that people now expect. Mastering modern JavaScript techniques and the toolchain are essential to develop web-scale applications.
Mastering JavaScript will be your companion as you master JavaScript and build innovative web applications. To begin with, you will get familiarized with the language constructs and how to make code easy to organize. You will gain a concrete understanding of variable scoping, loops, and best practices on using types and data structures, as well as the coding style and recommended code organization patterns in JavaScript. The book will also teach you how to use arrays and objects as data structures. You will graduate from intermediate-level skills to advanced techniques as you come to understand crucial language concepts and design principles. You will learn about modern libraries and tools so you can write better code.
By the end of the book, you will understand how reactive JavaScript is going to be the new paradigm.
Style and approach
This is a comprehensive guide with a clear focus on practical use cases and patterns. Each chapter consists of best practices, useful advice, and a bunch of easy-to-follow examples that will build up your skills as you advance through the book.
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Seitenzahl: 282
Veröffentlichungsjahr: 2016
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Mastering JavaScript
Mastering JavaScript
Copyright © 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: January 2016
Production reference: 1250116
Published by Packt Publishing Ltd.
Livery Place
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Birmingham B3 2PB, UK.
ISBN 978-1-78528-134-1
www.packtpub.com
Credits
Author
Ved Antani
Reviewer
Ivano Malavolta
Commissioning Editor
Sarah Crofton
Acquisition Editor
Kevin Colaco
Content Development Editor
Merint Mathew
Technical Editor
Manthan Raja
Copy Editor
Tasneem Fatehi
Project Coordinator
Francina Pinto
Proofreader
Safis Editing
Indexer
Monica Ajmera Mehta
Production Coordinator
Conidon Miranda
Cover Work
Conidon Miranda
About the Author
Ved Antani is an AVP (engineering) at Myntra. Before Myntra, he worked with Electronic Arts, NetApp, and Oracle. Ved is passionate about programming and has been programming in JavaScript since 2005. He has extensive experience in building scalable systems and mobile applications. Ved is a minimalist, a father, and an avid tea drinker.
I would like to thank my wife, Meghna, for her support. She was always there to encourage and help me when I needed it the most.
About the Reviewer
Ivano Malavolta is a postdoctoral researcher at the Gran Sasso Science Institute (L'Aquila, Italy), and he holds a PhD in computer science from the University of L'Aquila. His research is positioned in three main fields: software architecture, Model-Driven Engineering (MDE), and mobile-enabled systems. He is especially interested in investigating how MDE techniques can be exploited for architecting complex and mobile-enabled software systems at the right level of abstraction. He is the author of more than 40 papers in international journals and peer-reviewed international conferences' proceedings; among them, he has coauthored two articles published in the IEEE Transactions on Software Engineering (TSE), which is considered the leading journal in the field of software engineering. He is a reviewer for four international journals, a program committee member of 10 international conferences, a reviewer for 13 international conferences, and a guest editor of an international journal.
He is an instructor of three courses on software engineering, mobile computing, and mobile application development via web technologies; these courses are held at the University of L'Aquila and Gran Sasso Science Institute, Italy.
He has previously reviewed other books about web technologies for Packt Publishing, such as Backbone.js Cookbook by Vadim Mirgorod and Backbone.js Blueprints by Andrew Burgess.
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Preface
It would seem that everything that needs to be written about JavaScript has been written. Frankly, it is difficult to find a topic related to JavaScript that has not been discussed ad nauseam. However, JavaScript is changing at a rapid pace. ECMAScript 6 has the potential to transform the language and how we code in it. Node.js has already changed the way in which we write servers in JavaScript. Newer ideas such as React and Flux will drive the next iteration of the language. While we spend our time learning the new features, there is no denying that the foundational ideas of JavaScript have to be mastered. These ideas are fundamental and need attention. If you are already an experienced JavaScript developer, you will realize that modern JavaScript is vastly different from the language that most people have known. Modern JavaScript demands a specific stylistic discipline and rigor of thought. Tools are more powerful and slowly becoming an integral part of the development workflow. Though the language seems to be changing, it is built on some very solid and constant ideas. This book emphasizes on these fundamental ideas.
While the book was being written, things kept changing in the JavaScript landscape. Luckily, we were able to include all the important and relevant updates in this book.
Mastering JavaScript provides you with a detailed overview of the language's fundamentals and some of the modern tools and libraries, such as jQuery, Underscore.js, and Jasmine.
We hope that you enjoy this book as much as we enjoyed writing it.
What this book covers
Chapter 1, JavaScript Primer, focuses on the language constructs without spending too much time on the basic details. We will cover the trickier parts of variable scoping and loops and best practices for using types and data structures. We will also cover a lot of ground on the coding style and recommended code organization patterns.
Chapter 2, Functions, Closures and Modules, covers the core of the language intricacies. We will discuss the complexities involved in using functional aspects with different treatment for closures in JavaScript. This is a careful and elaborate discussion that will prepare you to explore more advanced design patterns further on.
Chapter 3, Data Structures and Manipulation, takes a detailed look at regular expressions and arrays. Arrays are a fundamental data type in JavaScript and this chapter will help you work effectively with arrays. Regular expressions can make your code concise—we will take a detailed look at how to use RegEx effectively in your code.
Chapter 4, Object-Oriented JavaScript, discusses object orientation in JavaScript. We will discuss inheritance and the prototype chain and focus on understanding the prototypal inheritance model that JavaScript offers. We will also discuss how different this model is from other object-oriented models to help Java or C++ programmers get familiarized with the change.
Chapter 5, JavaScript Patterns, discusses common design patterns and how to implement them in JavaScript. Once you master the object-oriented model for JavaScript, it is easier to understand design and programming patterns to write modular and easy-to-maintain code.
Chapter 6, Testing and Debugging, covers various modern methods to test and debug issues in JavaScript code. We will also explore continuous testing and test-driven methodologies for JavaScript. We will use Jasmine as the test framework.
Chapter 7, ECMAScript 6, focuses on the newer language features introduced by ECMAScript 6 (ES6). It makes JavaScript more powerful and this chapter will help you understand the newer features and how to use them in your code.
Chapter 8, DOM Manipulation and Events, takes a detailed look at JavaScript as a language of the browser. This chapter discusses DOM manipulation and browser events.
Chapter 9, Server-Side JavaScript, explains how we can use Node.js to write scalable server systems in JavaScript. We will discuss the architecture of Node.js and several useful techniques.
What you need for this book
All the examples in this book can be run on any modern browser. For the last chapter, you will need Node.js. You will need the following prerequisites to run the examples and samples from this book:
Who this book is for
This book is intended to equip you with the details necessary to master JavaScript. This book will be useful for the following audience:
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Questions
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Chapter 1. JavaScript Primer
It is always difficult to pen the first few words, especially on a subject like JavaScript. This difficulty arises primarily because so many things have been said about this language. JavaScript has been the Language of the Web—lingua franca, if you will, since the earliest days of the Netscape Navigator. JavaScript went from a tool of the amateur to the weapon of the connoisseur in a shockingly short period of time.
JavaScript is the most popular language on the web and open source ecosystem. http://githut.info/ charts the number of active repositories and overall popularity of the language on GitHub for the last few years. JavaScript's popularity and importance can be attributed to its association with the browser. Google's V8 and Mozilla's SpiderMonkey are extremely optimized JavaScript engines that power Google Chrome and Mozilla Firefox browsers, respectively.
Although web browsers are the most widely used platforms for JavaScript, modern databases such as MongoDB and CouchDB use JavaScript as their scripting and query language. JavaScript has become an important platform outside browsers as well. Projects such as Node.js and io.js provide powerful platforms to develop scalable server environments using JavaScript. Several interesting projects are pushing the language capabilities to its limits, for example, Emscripten (http://kripken.github.io/emscripten-site/) is a Low-Level Virtual Machine (LLVM)-based project that compiles C and C++ into highly optimizable JavaScript in an asm.js format. This allows you to run C and C++ on the web at near native speed.
JavaScript is built around solid foundations regarding, for example, functions, dynamic objects, loose typing, prototypal inheritance, and a powerful object literal notation.
While JavaScript is built on sound design principles, unfortunately, the language had to evolve along with the browser. Web browsers are notorious in the way they support various features and standards. JavaScript tried to accommodate all the whims of the browsers and ended up making some very bad design decisions. These bad parts (the term made famous by Douglas Crockford) overshadowed the good parts of the language for most people. Programmers wrote bad code, other programmers had nightmares trying to debug that bad code, and the language eventually got a bad reputation. Unfortunately, JavaScript is one of the most misunderstood programming languages (http://javascript.crockford.com/javascript.html).
Another criticism leveled at JavaScript is that it lets you get things done without you being an expert in the language. I have seen programmers write exceptionally bad JavaScript code just because they wanted to get the things done quickly and JavaScript allowed them to do just this. I have spent hours debugging very bad quality JavaScript written by someone who clearly was not a programmer. However, the language is a tool and cannot be blamed for sloppy programming. Like all crafts, programming demands extreme dedication and discipline.
A little bit of history
In 1993, the Mosaic browser of National Center for Supercomputing Applications (NCSA) was one of the first popular web browsers. A year later, Netscape Communications created the proprietary web browser, Netscape Navigator. Several original Mosaic authors worked on Navigator.
In 1995, Netscape Communications hired Brendan Eich with the promise of letting him implement Scheme (a Lisp dialect) in the browser. Before this happened, Netscape got in touch with Sun Microsystems (now Oracle) to include Java in the Navigator browser.
Due to the popularity and easy programming of Java, Netscape decided that a scripting language had to have a syntax similar to that of Java. This ruled out adopting existing languages such as Python, Tool Command Language (TCL), or Scheme. Eich wrote the initial prototype in just 10 days (http://www.computer.org/csdl/mags/co/2012/02/mco2012020007.pdf), in May 1995. JavaScript's first code name was Mocha, coined by Marc Andreessen. Netscape later changed it to LiveScript, for trademark reasons. In early December 1995, Sun licensed the trademark Java to Netscape. The language was renamed to its final name, JavaScript.
