Callbacks were the only natively supported way to deal with async code in JavaScript until 2016, when the Promise object was introduced to the language. However, JavaScript developers had been ...

AJAX (Asynchronous JavaScript and XML) is a technique aimed at creating ... Also, conventional web applications transmit information to and from the web server using synchronous requests, which ...

and code can be written in a synchronous way while remaining asynchronous. While async/await had already been in the 7.x line, an update to version 5.5 of Google’s V8 JavaScript engine in ...