Summary

This was a hard, long, and complicated chapter. I'll quote a phrase Aaron Hillegass uses frequently in his books: "Programming is hard and you are not stupid." There were plenty of areas where a small typo could trip you up, and you may have had to go backward and forward several times. That's all okay – it's part of the learning process. I would encourage you to experiment with the skeleton we've built, even before moving onto the next chapter, as it's a great way to ensure you understand all the code.

In the end, we've accomplished a lot. We've created a game loop that will run in the browser at 60 frames per second while updating at a fixed step. We've set up an XNA-like game "engine" and separated the engine concerns from the game concerns. Our browser interface is wrapped in a module so that we can hide some of the details of the browser implementation. We're even processing input, making this work...