THE CHIEF ARCHITECT TUTORIAL IS FULL OF MISTAKES CODE

You're making the UI cleaner or more modern, you're redoing infrastructure because it needs to have a different architecture to scale better, or you're redoing code because you realized it was too unwieldy to add a new feature. With a site as popular as Facebook and with as much money at stake, you're always rebuilding parts of it. You also save yourself some costs on training new employees who don't know PHP, of which there are many.ДЄlso, over time you will probably rewrite a lot of your codebase anyway. So you don't have to retrain anywhere near your whole staff. In fact, it could very easily be that the majority do, since Java is the most popular language right now. If you switch to Java, it's a fair assumption that many of the developers working for you already know Java. I don't think the costs are quite that bad. Than to boil the ocean by rewriting your entire codebase and retraining (or, God help us all, replacing) your entire development staff.

If you have published schemas, that is (apparently Uber hasn't). However, even if you are in a pure-JavaScript shop for instance, you can still use JSON-Schema to validate the payloads coming in over-the-wire. A lot of 'dynamic language' devs don't really understand what that gives you, and it's one of the reason why they aren't taken very seriously in most enterprise environments. Apache has Avro, which seems to be taking over leadership in this space.ДЄll of these tools allow you to generate code, to which you can marshal and unmarshal your over-the-wire payloads (e.g. which does the same thing, but also provides an efficient binary format for the over-the-wire payloads. The same pattern works today with JSON-Schema and Jackson. But in any large system, you need support for validating your over-the-wire payload against a schema contract.Д®nterprise Java guys have spent the past two decades using XML-Schema and JAX-B for this purpose. There's nothing wrong with sending JSON over the wire. Are you interested in promoting your own content? STOP! Read this first.For posting job listings, please visit /r/forhire or /r/jobbit.Do you have something funny to share with fellow programmers? Please take it to /r/ProgrammerHumor/.Do you have a question? Check out /r/learnprogramming, /r/cscareerquestions, or Stack Overflow.Direct links to app demos (unrelated to programming) will be removed.If there is no code in your link, it probably doesn't belong here. Just because it has a computer in it doesn't make it programming.That means no image posts, no memes, no politics.Please keep submissions on topic and of high quality.r/programming is a reddit for discussion and news about computer programming

The chief architect tutorial is full of mistakes