[REBOL] Re: Switch with refinements/hmmm!
From: media:quazart at: 2-Nov-2001 9:04
Hi Joel,
we are saying the same thing... as we both said, "any/all" improves
readability and then depending on the actual code you have to perform after
the "filter" you must just make sure that it works.
here is a little trick to improve speed ;-)
refa: true
refb: true
refc: false
any [
all [refa refb refc ( print "A and B and C" true)]
all [refa refb ( myvar: none print "A and B" true)]
all [refc ( print "nothing set" true)]
]
I'm not trying to prove anything or you wrong... I'm just giving you a
little trick to prevent a short cicuit. In most cases, by putting your
stuff in a little set of parenthesis and ending it with a true... you
prevent the expression from short-circuiting. Even though (like in this
example) I set something to none, the print statement still executes,
because all is only concerned with what the expression returns... in this
case its always true... so it wont evaluate anything else...
consider the following:
refa: true
refb: false
refc: true
any [
all [refa ( print "A " false)]
all [refb ( myvar: none print "B" false)]
all [refc ( print "C" false)]
]
here every true reference will be called...
peace ;-)
-MAx
