In this chapter, we've gone through a quick example of how promises work, by going over just the very fundamentals. Async is a critical part to Node.js. We went through the very basics of callbacks and promises. We looked a few examples, creating a pretty cool weather app.

This brings us to the end of our asynchronous Node.js programming, but this does not mean that you have to stop building out the weather app. There are a couple ideas as to what you could do to continue on with this project. First up, you can load in more information. The response we get back from the weather API contains a ton of stuff besides just the current temperature, which is what we used. It'd great if you can incorporate some of that stuff in there, whether it's high/low temperatures, or chances of precipitation.

Next up, it'd be really cool to have a default location ability. There would be a command that lets me set a default location, and then I could run the weather app with no location argument to use that default. We could always specify a location argument to search for weather somewhere else. This would be an awesome feature, and it would work kind of similar to the Notes app, where we save data to the filesystem.

In the next chapter, we'll start creating web servers, which will be async. We'll make APIs, which will be async. Also, we'll create real-time Socket.IO apps, which will be async. We'll move on to creating Node apps that we deploy to servers, making those servers accessible to anybody with a web connection.