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What are callbacks in JavaScript?

Answer»

In JavaScript, you can pass a FUNCTION to another function as an argument. A callback is a function passed as an argument into another function for executing later. JavaScript callback functions can be USED SYNCHRONOUSLY as well as asynchronously.  

Below is a simple example of callback functions in JavaScript.

function postProcessing(result) {           console.log(‘PROCESSING is over! The result returned is: ’ + result); } function addNumbers(a, b, NEXT) {           let sum = a + b;           next(sum); }

addNumbers(10, 5, postProcessing);

The output of the above code will be:

Processing is over! The result returned is: 15


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