Web Worker API

  1. What is a web worker
  1. Spawning a web worker
  1. Communicating with a web worker
  1. Terminate a web worker

Types of web workers

  1. Dedicated workers
  1. Shared Workers

Limitations

  1. Same origin policy
  1. Limited Access - Ex: DOM, Document Object, Window, Parent.
  1. Restricted Local Access

Can we embedded Workers?

Examples

Demo

scenarios

  1. Syntax highlighting in code editors
  1. https://nerget.com/rayjs-mt/rayjs.html
  1. http://www.sudokubum.com/
  1. Games

Graphics

Crypto

Handling Ajax call backs even if user navigates to different page

Imagine if we are building an Excel app, which will have intensive calculations.

  1. Cannot interrupt a worker

5.Cannot Share memory between two threads

In browser extensions

  1. https://github.com/mdn/simple-shared-worker

Browser Support