Code samples. This is what’s missing most of the time. Even if you encounter esoteric jargon, if they give a few examples, it’s pretty easy to decipher. Even big companies like Google give code examples in multiple languages.

Indeed, if the author had added this code sample, it all would have been clear.

    f←{⍸≠⌈\(⍴∘∪⊢∨⍳)¨⍳⍵}

Said in light-hearted jest, and not in sarcasm