If the audience is Java / Ruby, my guess is that they don't want to know
about emacs, for one.
My guess is also that it's not in 15 minute that you'll make them
comfortable with the IDE of using a LISP "syntax".

Of course, maybe they already know about clojure. If so, either they will
learn nothing, either it's a possibility for you to take out of their heads
false premature conclusions they may have inferred from what they've seen :
"lisp syntax, bleh"  ;   "functional programming, like if no current program
done in 'classic' languages/idioms worked".

You don't have to show the language. It's a means towards an end (several
ends, really).

Talk about the current problems in the field (hopefully in the domain
problem of the audience, though it's hard to guess), and which features
Clojure offers to solve them. Point them to clojure. LISP syntax is of
course not a detail (for macros), but almost.

2010/12/9 David Andrews <dammi...@gmail.com>

> You're not going to convey much useful information in 15 minutes, but
> you can do something inspiring.  A couple of years ago I saw a video -
> probably by Marco Berringer - that showed a CL/emacs expert solving a
> nontrivial problem.  I was purely amazed at the amount of code that
> appeared on the screen in a short length of time, and the stuff that
> had been accomplished by the end of the short video.
>
> So wow 'em (especially if you're comfortable with emacs).  Announce
> that you're going to build a webserver, take five minutes to install
> Clojure and Lein from scratch, then the last ten minutes to do a
> Compojure app.  They don't have to understand much of what you're
> doing; explain only in general terms as you proceed, don't get bogged
> in the details - it'll only slow you down, and you want to be
> productive.  Hopefully they'll come away impressed and wanting to know
> more.
>
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