Path: utzoo!attcan!uunet!husc6!ukma!psuvm.bitnet!rice.bitnet!pgreenea
From: PGREENEA@RICE.BITNET
Newsgroups: comp.sys.mac.hypercard
Subject: Re: efficient cardExists function
Message-ID: <346PGREENEA@RICE>
Date: 16 Jun 88 17:39:35 GMT
References: <5888@bunny.UUCP>
Organization: Rice University - ICSA
Lines: 30

In article 5888@bunny.uucp, jwg1@bunny.uucp (Jim Gish) says...

>I need a function CardExists ( cardName ) that will return true iff
>a card of name cardName exists in the stack.


One way, perhaps not the best, is

--------------------------------
push card
go to card cardName
if the result is empty then
   put true into itExists
else
   put false into itExists
end if
pop card
--------------------------------

If the card isn't there, the result will contain either "Can't find card
cardName" or "No such card"; I think it depends on the version of HyperCard
(the first message for 1.0.1, the second for 1.1 and 1.2).


Pam Greene
Rice University
PGREENEA@ICSA.RICE.EDU

Neither ICSA nor Rice (nor anyone else, for that matter) necessarily agrees
with me.  I'm just a student, after all; what do I know?