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
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Built-in Functions
Regular Expressions

Arrow functions


JavaScript uses almost all variations of arrows. With ES6, it introduces a new syntax for writing functions. We have always written function expressions in JavaScript. It is idiomatic to write code like this in JavaScript (this example is in jQuery):

    $("#submit-btn").click(function (event) { 
      validateForm(); 
      submitMessage(); 
    }); 

This is a typical jQuery event handler. The event handler click() function accepts a function as a parameter and we will simply create an inline anonymous function expression and pass it to the click function. This style of writing anonymous function expressions is known as Lambda functions. Several other languages support this feature. Though lambdas are more or less standard in new languages, JavaScript was responsible for popularizing their usage. However, the lambda syntax in JavaScript has not been very concise. ES6 arrow functions fill that gap and provide a concise syntax to write functions.

Arrow function...