I wrote a lot of APL for my undergraduate Senior Project in 1978/1979.

I really enjoyed it because it was fun. You could do an incredible amount of work in a single line of code.

The only problem was, that line would then be almost impossible to read and understand! It could easily be used as a "write-only" language even without a separate obfuscation step.

When I become a professional programmer right after college, I never used it again, and learned to write code that was readable above all else.