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

For...of loop

For...of loops are introduced in ES6 along with the iterable and iterator constructs. This new loop constructs replaces both the and for...each loop constructs of ES5. As the for...of loop supports the iteration protocol, it can be used on built-in objects such as arrays, strings, maps, sets, and so on, and custom objects that are iterables. Consider the following piece of code as an example:

    const iter = ['a', 'b']; 
    for (const i of iter) { 

The for...of loop works with iterables and built-ins like arrays are iterables. If you notice, we are using const instead of var when we define the loop variable. This is a good practice because when you use const, a fresh variable is created with a new binding and storage space. You should use const over a var declaration with the for...of loop when you don't intend to modify the value of the loop variable inside the block.

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