Chapter 6. Callbacks in Asynchronous Programming

This chapter is the second part of our asynchronous programming in Node.js. In this chapter, we'll look at callbacks, HTTP requests, and more. We're going to handle a lot of the errors that happen inside callbacks. There's a lot of ways our request in app.js can go wrong, and we'll want to figure out how to recover from errors inside of our callback functions when we're doing asynchronous programming.

Next, we'll be moving our request code block into a separate file and abstracting a lot of details. We'll talk about what that means and why it's important for us. We'll be using Google's Geolocation API, and we'll be using the Dark Sky API to take location information like a zip code and turn that into real-world current weather information.

Then, we'll start wiring up that forecast API, fetching real-time weather data for the address that's geocoded. We'll add our request inside of the callback for geocodeAddress. This will let us take that dynamic...