Learning Node.js Development

Creating the callback function

Now before we actually make an HTTP request to Google, let's create a callback function example inside our playground folder. Let's make a new file called callbacks.js:

Inside the file, we'll create a contrived example of what a callback function would look like behind the scenes. We'll be making real examples throughout the book and use many functions that require callbacks. But for this chapter, we'll start with a simple example.

To get started, let's make a variable called getUser. This will be the function we'll define that will show us exactly what happens behind the scenes when we pass a callback to another ...