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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?
Same, it usually whacked about half the attempted majors into another major. In the first half of senior year. They kept wondering why their program wasn't growing much even though similar colleges' programs were growing like mold on a dorm shower curtain. I enjoyed the course and never used the primary skills taught in it again.
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.