Plot: A Programming Language for Old Timers (2009)

wow, thanks for the pointer!

amazing what happens when you throw out all the excessive JS and CSS isn't it. ;)

People complain about the web being slow but it's not the web, or web browsers. It's all the crap we've shoved into web sites that they just don't need.

Yes, it supports multiple dispatch. And so does CLOS (Common Lisp Object System)

The designer of this language, David Moon, was also one of the designers of Dylan and Common Lisp.

I'm pretty sure Moon (who is a famous old-school lisp hacker) will have at least some prototyping quality implementation somewhere, the design is to detailed for a mere thought experiment and there are longer code snippets around:

http://users.rcn.com/david-moon/PLOT/page-35.html

I read about PLOT years ago and thought the approach to syntax (and macros) was quite clever; I don't remember the exact details but it was the first time I had seen something that was both hygenic and not horribly complex to implement.

BTW, his markdown alternative (MMD -- Moon's Mark Down) also looks pretty nice (expressive and lightweight, but unlike org mode or other monstrosities trivial to parse and unambigious). http://users.rcn.com/david-moon/MMD/HTML/index.html

He also has a ~700 LOC standalone python implementation which includes the sequence diagram drawing code: http://users.rcn.com/david-moon/MMD/MMD.py.