Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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@neurocy @jeanqasaur @tiarkrompf @hypotext @simrob @jrk PL people I follow: how would you define the term "programming languages"? Context: http://willcrichton.net/notes/what-is-a-pl-survey/ …
If I answered with "programming languages are artifacts amenable to analysis by the tools of academic programming language theory" then I can transform the problem to one that I also don't know the answer to! Cc @chrisamaphone https://twitter.com/chrisamaphone/status/964144596132466690 …
seems kinda circular no?
"A computer language that people program in." Or something else, depending on the context. It's a vague term, and that's fine; and this is a vague definition, and that's fine. Not everything needs a precise definition, and most time spent arguing about definitions is wasted.
user interfaces like those presented by Word and Eclipse can definitely be productively cast as programming languages. a few of the other examples, e.g. CSS and HTML, seem more like data structures used by the "web browser" programming language.
I wonder where the 7% of people who think JavaScript is not a programming language are coming from. I can't think of any sense of the phrase where JavaScript doesn't count, but Java does.
instead of defining the term, I'll give some examples of things outside the computer domain that might be understood and studied as programming languages: LeWitt's wall drawings, plays, recipes, laws, wishes, natural language, knitting patterns, scores for music and dance
I like to talk about slide rules and Jacquard machines too!
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