This latter function creates a Worker object called worker, which is configured with the worker.js file. To learn more about JavaScript promises, see 5 ways to use JavaScript promises.

Developers use JavaScript promises to model asynchronous operations in web and server-side programs. Here's a quick look at five ways to use promises in your code.

Learn what the "this" keyword does in JavaScript in 100 seconds. And stay tuned for a few minutes of more advanced discussion after the credits. Live updates: Trump to seize control of DC police ...