Book Image

Mastering JavaScript

By : Ved Antani
Book Image

Mastering JavaScript

By: Ved Antani

Overview of this book

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.
Table of Contents (16 chapters)
Mastering JavaScript
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Regular expressions


If you are not familiar with regular expressions, I request you to spend time learning them. Learning and using regular expressions effectively is one of the most rewarding skills that you will gain. During most of the code review sessions, the first thing that I comment on is how a piece of code can be converted to a single line of regular expression (or RegEx). If you study popular JavaScript libraries, you will be surprised to see how ubiquitous RegEx are. Most seasoned engineers rely on RegEx primarily because once you know how to use them, they are concise and easy to test. However, learning RegEx will take a significant amount of effort and time. A regular expression is a way to express a pattern to match strings of text. The expression itself consists of terms and operators that allow us to define these patterns. We'll see what these terms and operators consist of shortly.

In JavaScript, there are two ways to create a regular expression: via a regular expression...