🚀 go-pugleaf

From the keyboard of sdm@cs.brown.edu (Scott Meyers):
:2.  Some languages allow for multiple assignments as part of the same
:    statement, where the semantics are that all right-hand sides are
:    evaluated before any left-hand sides.  To swap x and y, then, you can
:    just write this:
:
:        x = y, y = x
:
:    This is completely deterministic -- it's not the same as saying that
:    the two assignments are carried out in parallel.
:
:    Anyway, I've forgotten where I read about this construct (I thought it
:    was CSP, but I appear to have been mistaken), and I'd like to give a
:    citation for one or more languages that use it.  Obviously, the
:    language that originated the construct would be nice, but I'm not that
:    picky.   Anybody know what language(s) support this construct?

Perl supports multiple assignments:

    ($x, $y) = (Peanuts, Pecans);
means
    $x = Peanuts; 
    $y = Pecans;

and also allows you to swap values as you're looking for:

    ($x, $y) = ($y, $x);

--tom
-- 
    Tom Christiansen      tchrist@convex.com      convex!tchrist

"We're going to have the best  educated Americans in the world!"    
	    --Dan Quayle