How about we do another one of those things right now? As mentioned before, the output from our little server app is pretty dull. Let's render a map using Canvas.
We haven't really talked about it much, but Canvas is another cool way D3 can be used to render data. Instead of writing a bunch of elements into a DOM tree format like SVG, Canvas renders pixels in a 2D plane, which can be much better for performance. It's a much different workflow than what we're used to, and I don't focus on it too much in this book because it tends to be harder to debug for beginners, but let's give it a shot and deep dive into it for one example.
By the way, it's worth noting this is a super weird way to use Canvas compared to how we can in the browser; normally, we'd just rely on the browser's built-in Canvas renderer, but we don't have that luxury on the server. Note, however, that the Canvas code we're writing for node-canvas will work the same way in the browser, in case...