I don't understand why people criticize this post. When you run a homepage or a blog, it's unavoidable to write script style code. Even if the quality is a bit low, that's the limit within a tutorial. Because if you go into actual design, things like boundaries, policies, error handling, and so on require a lot of prior knowledge. So when certain knowledge is needed, you can only post something as a simple runnable script.

For example, if I were building real software, I would design everything from policy to error logging policies and so on. But when writing a blog post, it's just simplified into a short runnable script.