The Fetch API and async() functions with await are modern JavaScript patterns that aren’t always supported by old browsers, particularly non-Edge IE browsers.

Callbacks work fine for handling asynchronous code in JavaScript, but promises and the async and await keywords are cleaner and more flexible.

Q&A Mastering Modern JavaScript By David Ramel 04/22/2025 JavaScript could be the most widely used programming language in the world, but for many developers, its modern version looks very different ...