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A callback is a function passed as an argument to another function. Using a callback, you could call the calculator function ( myCalculator ) with a callback ( myCallback ), and let the calculator function run the callback after the calculation is finished:
A callback function is a function passed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action. The consumer of a callback-based API writes a function that is passed into the API.
In JavaScript, a callback is a function passed to another function to execute after an asynchronous operation completes. Callback hell refers to the problematic situation where multiple nested callbacks create a "pyramid of doom," making the code difficult to read, debug, and maintain.
A callback function is a function that is passed as an argument to another function, to be “called back” at a later time. A function that accepts other functions as arguments is called a higher-order function, which contains the logic for when the callback function gets executed.
Summary: in this tutorial, you will learn about JavaScript callback functions including synchronous and asynchronous callbacks. In JavaScript, functions are first-class citizens. Therefore, you can pass a function to another function as an argument.
In JavaScript, the way to create a callback function is to pass it as a parameter to another function, and then to call it back right after something has happened or some task is completed. Let’s see how…
It is essential to understand how functions are treated in JavaScript, as they serve as a building block to understanding higher order and callback functions in JavaScript and how they work. What are Higher Order Functions?