In this chapter, we looked beyond the event loop as a concurrency mechanism in NodeJS. We started out by implementing coroutines using the Co library. From there, we learned about launching new processes, including the difference between forking another Node process and spawning other non-Node processes. Then, we looked at another approach to managing concurrency using the cluster module, which makes handling web requests in parallel processes as transparent as possible. Finally, we wrapped up the chapter with a look at using the node-http-proxy module to parallelize our web requests at the machine level.
That does it for JavaScript concurrency topics. We've covered a lot of ground, both in the browser and in Node. But, how do these ideas and components all come together to form a concurrent application? In the final chapter of this book, we'll walk through the implementation of a concurrent app.