We came a long way in this chapter, but maybe Facebook doesn't have anything to fear from the baby steps we took toward converting the Notes application into a social network. Still, we added interesting new features to the application, which gave us the opportunity to explore some really cool technology for pseudo-real-time communication between browser sessions.
We learned about using Socket.IO for pseudo-real-time web experiences. As we learned, it is a framework for dynamic interaction between server-side code and client code running in the browser. It follows an event-driven model for sending events between the two. Our code used this both for notifications to the browser of events occurring on the server and for users who wish to write comments.
We learned about the value of events being sent from one part of the server-side code to another. This lets us have client-side updates based on changes occurring in the server. This used the EventEmitter class with listener...
