Stopping workers with terminate

Not all problems are cumulative. Some have a desired goal state; once it is found, then the program can exit. We've seen that workers communicate their results by posting messages. Now our program is completed, it would be nice to prevent future messages from being received, possibly polluting our results.

In this recipe, we'll see how to use Worker.terminate to immediately stop a Worker.

Getting ready

This recipe assumes you already have a workspace that allows you to create and run ES modules in your browser. If you don't, please see the first two chapters.

How to do it...

1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 05-04-stop-workers-with-terminate.
3. Copy or create an index.html that loads and runs a main function from main.js.

4. Create a main.js with a function named onMessage that takes a message and workers argument, logs out the type and timeout properties of message.data, and calls terminate on all the workers...