ECMAScript Cookbook

How to do it...

1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 05-03-send-data-to-and-from-web-workers.
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 an argument message and logs out the type and index properties:

// main.js 
function onMessage(message) { 
  const { result, type } = message.data; 
  console.log('Result for operation (%s): (%s)', type, result); 
}  

5. Create a main function that creates a worker, sets the onMessage property, creates an array of random numbers, and posts two messages to the worker, one to sum some of the numbers and another to average them:

export function main() { const worker ...