I write Ruby for a living, and about two years ago it started bothering me that I had no real idea what happens between typing x = 5 and the machine doing something about it. So I wrote a toy interpreter over a weekend. Got it evaluating arithmetic.
Source: [Dev.to](https://dev.to/konstanty_koszewski/i-wrote-a-programming-language-where-you-code-in-polish-here-are-7-things-it-taught-me-about-ruby-51on)