Thanks for this, but as a complete beginner I didn't really get the point of the raw code with no comments explaining it. I was left asking myself what am I missing because the title seemed beginner friendly. Maybe if someone is really experienced they can figure out what all the "core principles" are in the "one file" but I didn't.

So if a complete beginner is reading this, I suggest copying and pasting the code into your favourite AI chat (I used Claude 3.5 Sonnet) and then prompt it to learn from the raw code.

For example, I asked Claude "what is this code illustrating?" for the React code and got a good response, and then I picked apart the list of key concepts Claude identified with further prompts.

Only after doing that was I able to get any use and understanding from the post.