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Learn ECMAScript

You're reading from   Learn ECMAScript Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript

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Product type Paperback
Published in Feb 2018
Publisher
ISBN-13 9781788620062
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Narayan Prusty Narayan Prusty
Author Profile Icon Narayan Prusty
Narayan Prusty
MEHUL MOHAN MEHUL MOHAN
Author Profile Icon MEHUL MOHAN
MEHUL MOHAN
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Table of Contents (14) Chapters Close

Preface 1. Getting Started with ECMAScript FREE CHAPTER 2. Knowing Your Library 3. Using Iterators 4. Asynchronous Programming 5. Modular Programming 6. Implementing the Reflect API 7. Proxies 8. Classes 9. JavaScript on the Web 10. Storage APIs in JavaScript 11. Web and Service Workers 12. Shared Memory and Atomics 13. Other Books You May Enjoy

Introduction to inline web workers


It is possible to create a web worker from a single file without actually having a separate JS file for your web worker. However, I still recommend that you create a different file for your web workers, for the sake of clarity of code and to make it more modular. Modularity is always preferred in programming.

We can make use of blob URLs to actually point data in memory to a URL, and then load the blob URL instead of an actual file URL. Since this URL is generated dynamically only on the user's computer, you do not need to create a separate file for that particular web worker. Here's how we'll do that:

const blob = new Blob(['(',
function() {
    // web worker code here
}.toString(),
')()'], { type: 'application/javascript' }));

const url = URL.createObjectURL(blob); // gives a url of kind blob:http://....
const awesomeworker = new Worker(url);

It sometimes makes it easy to quickly fire a small web worker. However, this approach won't work for shared web...

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