JavaScript and JSON Essentials - Second Edition

Traditional callbacks

The callback is a simple, anonymous function that is passed as a parameter and invoked when required inside another function's scope. Consider the following snippet:

function greetAll(callback){ console.log("Hello Readers!"); console.log(`Greeting from the ${callback()}`)}greetAll(()=>{ return "Author";})

In the preceding code, we have a greetAll function that contains a simple parameter named callback. On invocation of the greetAll function, we have passed an anonymous function as a parameter. Henceforth, greetAll is executed in a programming context that performs the following stepwise operation:

1. Firstly, it logs Hello Readers!
2. While the second log is being executed from left to right, it invokes the parameter named ...