For example: Doing asynchronous operations, event handling, timers etc. A callback is a function that gets called after another function has completed its execution. Given that JavaScript is an ...

JavaScript itself is synchronous and single-threaded language. but you can write code in such a manner that function execution take a long time and can be interleaved with other operations. First, let ...

Historically, the first example was the motivation to make node.js asynchronous, and the second one is what made javascript ... Synchronous functions do not need callbacks. This is because when their ...

Callbacks were the only natively supported way to deal with async code in JavaScript until 2016 ... to coordinate multiple layers of execution. Asynchronous functions that use callbacks take ...

Promises, handlers, and chains are foundations of modern JavaScript, but they can be tricky. Here are four common traps to ...

A few months before its expected approval, ECMAScript 2017, the latest official specification underlying JavaScript, has been fleshed out with async functions and shared memory capabilities.