They are the foundation of promises and async/await in modern JavaScript, which provide more elegant ways to work with asynchronous code. a callback function is like a message you leave for a friend.

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 ...

The sample code highlights a few approaches to unnesting callbacks in JavaScript to both improve code readability and to increase performance. The performance tuning aspects are 100% from Trevor ...

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Similarly, a callback JavaScript can do other things while waiting for some ... This results in many nested callbacks, making the code difficult to write and manage, similar to having too many ...

which provide more elegant ways to work with asynchronous code. In JavaScript, a callback is a function that is passed as an argument to another function and is executed after a particular event ...