In the Terminal, we'll run the callback function using node, which is in the playground folder, and we call the file callbacks.js:
node playground/callback.js
When we run the file, right away our data prints to the screen:
We've created a callback function using synchronous programming. Now as I mentioned, this is still a contrived example because there is no need for a callback in this case. We could simply return the user object, but in that case, we wouldn't be using a callback, and the whole point here is to explore what happens behind the scenes and how we actually call the function that gets passed in as an argument.