JavaScript All-in-One For Dummies

Chapter 11

Writing Asynchronous JavaScript

IN THIS CHAPTER

Multitasking with Asynchronous JavaScript

Making promises you can keep

Putting it all together with AJAX

Fetching data

Simplifying promises with async and await

Understanding CORS

Working with JSON

“Your mind will answer most questions if you learn to relax and wait for the answer.”

—WILLIAM S. BURROUGHS

There's no getting around the fact that everything a computer program does takes time. Some actions, like declaring a variable or performing a simple calculation, take such a small amount of time that the action seems instantaneous. But when programs start to involve network requests, database access, and accessing resources outside of the web browser, wait times can start to add up.

Understanding Asynchronous JavaScript ...