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I had to design a simple general purpose language for university, so I tried creating "ZoomerScript" with Jetbrains MPS
(infosec.pub)
Insert <it's not much but it's honest work> meme. It only supports ints and bools, some logic and simple arithmetics and it compiles to Java but damn was it hard to get that far.
Can you guess what everything does?
It really depends on what you do, but somehow, I actually did end up using some of the things those courses were teaching. It turns out the visitor pattern is extremely useful for writing JavaScript code transformers.