pewallin

Well, he is widely regarded as one of the best writers of all time and among other things won the Nobel prize in literature http://www.nobelprize.org/nobel_prizes/literature/laureates/.... Don't mistake brevity for simplicity. Btw, If you are just starting out I highly recommend The Sun Also Rises.

Basically by disallowing read access to /users in the Firebase security rules (which you should do), the latter 50% of the article would be moot. However the html injection is interesting, be extra careful to validate data when using dynamic jquery-selectors?

If you are new to Javascript you should note that this tutorial makes heavy use of Promises which is one way to handle callbacks piling up, but it's not the only way, or even the most common.

Node.js and Firebase work very well together.

Previous discussion from a couple of months ago: https://news.ycombinator.com/item?id=4603204