Book Image

Learn ECMAScript - Second Edition

By : MEHUL MOHAN, Narayan Prusty
Book Image

Learn ECMAScript - Second Edition

By: MEHUL MOHAN, Narayan Prusty

Overview of this book

Learn ECMAScript explores implementation of the latest ECMAScript features to add to your developer toolbox, helping you to progress to an advanced level. Learn to add 1 to a variable andsafely access shared memory data within multiple threads to avoid race conditions. You’ll start the book by building on your existing knowledge of JavaScript, covering performing arithmetic operations, using arrow functions and dealing with closures. Next, you will grasp the most commonly used ECMAScript skills such as reflection, proxies, and classes. Furthermore, you’ll learn modularizing the JS code base, implementing JS on the web and how the modern HTML5 + JS APIs provide power to developers on the web. Finally, you will learn the deeper parts of the language, which include making JavaScript multithreaded with dedicated and shared web workers, memory management, shared memory, and atomics. It doesn’t end here; this book is 100% compatible with ES.Next. By the end of this book, you'll have fully mastered all the features of ECMAScript!
Table of Contents (18 chapters)
Title Page

Chapter 10. Storage APIs in JavaScript

Imagine you're on Facebook and have logged in to your account. You see your news feed; everything looks normal. Next, you click on a post, and you're made to log in again. That's strange. You continue and log in one more time, and the post opens. You click on a link in a comment, and you're made to log in yet again. What is happening?

That's what would happen if we lived in a world without storage APIs on the frontend.

In this chapter, we'll take a look at the following topics:

  • How the internet works because of cookies
  • Different forms of data storage areas available in JavaScript
  • Methods associated with localStorage and sessionStorage objects
  • An introduction to indexedDB
  • How to use indexedDB to perform basic adding, deleting, and reading operations