Rushabh Mulraj Shah - Decoding JavaScript

Mulraj D. Shah & Harsha M. Shah
My parents, for not giving in to social norms and pushing me to fly.

Unnati Vora
From being friends to being my wife, you have been
the perfect pillar of support.

John Thomas
When I wanted a friend, I ended up getting
an elder brother and a mentor.

Dr. Soudip Roy Chowdhury
The gaffer, who always believed in me and never gave up on me.

Rushabh Mulraj Shah is a published technical author, technical mentor, content-creator, and a Senior UI Developer. He is also one of the founding members of an exciting AI startup that goes by the name of eugenie.ai. In his 5+ years of experience, while working for companies like Capgemini International, Fractal, and eugenie.ai, he has interacted with several prominent clients, including the Indian Navy, Mondelez India, Colgate Palmolive, EY, RB, and many others.

Apart from his usual stint, Rushabh has also been an influential blogger and a content writer. His articles on SportsKeeda, Little Black Book (LBB), NearFox, Zomato, and other such platforms have garnered more than 600K views. His private blog (http://thevegfoodgasms.blogspot.com/) has been nominated for four consecutive years on the national level.

Vinay Joshi has 9 years of experience with Applications development in web, mobile and platforms using tools like .Net, Java, Node, Azure, GCP, Openshfit, with programming languages like C#, Javascript, Java, Typescript, Python, etc. He pursued Masters in Computer Applications from Dehradun Institute of Technology Dehradun, Uttarakhand. He has worked with companies like Publicis.Sapient, Next Gen Invent Corporation. He is currently working as Full Stack Developer in Role of Technology lead in Optum Global Solutions which is part of United Health Group in Gurgaon location.

When I started writing this book, an unthinkable event happened. As the first chapter went into drafts, the entire world slowly ceased to a standstill. The novel Coronavirus (COVID-19) forced the world to lock itself down. The lonely streets were accompanied by silent offices and quiet parks. In these tough times, I wouldn't have been able to complete this book if it was not for the constant support from my family. I would like to thank my parents - Mulraj D. Shah, Harsha M. Shah, and my wife, Unnati, for putting up with my late-night writing shenanigans.

The next acknowledgment goes to the entire team at BPB Publications for giving me this wonderful opportunity to write this book and share my experiences with everyone.

My final thanks goes to Mr. John Thomas, a genuine friend with a golden heart, for teaching me the best practices, and Mrs. Shweta Doshi and her team of GreyAtom to bring forth my love for teaching.

It's fair to say that the year 2020 will be imprinted boldly in the books of history. 2020 is the year when our fast-paced world took a pause, locked itself inside, and embarked on a journey to save the world, albeit strikingly different from the way the silver screen and its larger-than-life heroes portray it. It has also been the year when the Internet came to the fore. From rescue operations, data analysis, information service to locked-in entertainment, the Web and its insane variety of applications helped humanity wherever possible. It can only make you wonder the importance of the Web and its helpful associates.

This book is about web development. It is about unleashing the magic of JavaScript, a pretty straight-forward scripting language, that can help you create incredible next-generation applications on the Internet.

In simple words, web development is the process of creating and maintaining websites and web applications. The entire idea of web development revolves around the following three simple questions:

1. What can a user see on the screen?
2. How does it look?
3. What happens when a user interacts with what he/she sees on the screen?

While the answer to the first two questions creates a web page that the users can only see but not interact with, it is the answer to the third question that brings alive a web page. The three technologies, which help solve the three stated problems are HTML, CSS, and JavaScript. In this book, we will not only explore, but master advanced JavaScript. This will help you set up a base to build next-generation web applications.

Over the 16 chapters in this book, you will learn the following:

will introduce you to the world of JavaScript. In this chapter, we will revise the fundamental concepts of JavaScript. We will go through topics like the syntax of JavaScript, data types, operators, conditionals, looping, and hoisting in JavaScript. We will also see certain flavors of advanced JavaScript concepts.

browser-agnostic, i.e., it should be generalized and not specific for any browser. However, based on popularity and for the sake of simplicity, we will be working with the Google Chrome browser.