Book Image

Object-Oriented JavaScript - Third Edition

By : Ved Antani, Stoyan STEFANOV
5 (1)
Book Image

Object-Oriented JavaScript - Third Edition

5 (1)
By: Ved Antani, Stoyan STEFANOV

Overview of this book

JavaScript is an object-oriented programming language that is used for website development. Web pages developed today currently follow a paradigm that has three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). JavaScript is one important pillar in this paradigm, and is responsible for the running of the web pages. This book will take your JavaScript skills to a new level of sophistication and get you prepared for your journey through professional web development. Updated for ES6, this book covers everything you will need to unleash the power of object-oriented programming in JavaScript while building professional web applications. The book begins with the basics of object-oriented programming in JavaScript and then gradually progresses to cover functions, objects, and prototypes, and how these concepts can be used to make your programs cleaner, more maintainable, faster, and compatible with other programs/libraries. By the end of the book, you will have learned how to incorporate object-oriented programming in your web development workflow to build professional JavaScript applications.
Table of Contents (25 chapters)
Object-Oriented JavaScript - Third Edition
About the Authors
About the Reviewer
Customer Feedback
Built-in Functions
Regular Expressions


You can create a regular expression object using the RegExp() constructor. You pass the expression pattern as the first parameter and the pattern modifiers as the second:

    > var re = new RegExp('[dn]o+dle', 'gmi'); 

This matches "noodle", "doodle", "doooodle", and so on. It's equivalent to using the regular expression literal:

    > var re = ('/[dn]o+dle/gmi'); // recommended 

Chapter 4, Objects and Appendix D, Regular Expressions contain more information on regular expressions and patterns.

The RegExp.prototype members

Following are the RegExp.prototype members:




Read-only true if the g modifier was set when creating the regexp object.


Read-only. true if the i modifier was set when creating the regexp object.


Read-only. true if the m modifier was set when creating the regexp object


Contains the position in the string where the next match should start. test() and exec()set this position after a successful match. Only relevant when the g (global) modifier was used:

    > var re = /[dn]o+dle/g;   
    > re.lastIndex;   
    > re.exec("noodle doodle");   
    > re.lastIndex;   
    > re.exec("noodle doodle");   
    > re.lastIndex;   
    > re.exec("noodle doodle");   
    > re.lastIndex;   


Read-only. Returns the regular expression pattern (without the modifiers):

    > var re = /[nd]o+dle/gmi;   
    > re.source;   


Matches the input string with the regular expression. On a successful match returns an array containing the match and any capturing groups. With the g modifier, it matches the first occurrence and sets the lastIndex property. Returns null when there's no match:

    > var re = /([dn])(o+)dle/g;   
    > re.exec("noodle doodle");   
    ["noodle", "n",   "oo"]   
    > re.exec("noodle doodle");   
    ["doodle", "d",   "oo"]   

The arrays returned by exec() have two additional properties: index (of the match) and input (the input string being searched).


Same as exec() but only returns true or false:

    > /noo/.test('Noodle');   
    > /noo/i.test('Noodle');