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

Beginning and end


Frequently, we may wish to ensure that a pattern matches at the beginning of a string or perhaps at the end of a string. The caret character, when used as the first character of the RegEx, anchors the match at the beginning of the string such that /^test/ matches only if the test substring appears at the beginning of the string being matched. Similarly, the dollar sign ($) signifies that the pattern must appear at the end of the string: /test$/.

Using both ^ and $ indicates that the specified pattern must encompass the entire candidate string: /^test$/.