another doggone newbie problem:"&&" not short-circuiting like it

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Gurus,

I'm not really a newbie, I have a few years of Perling, but this one's got
me stumped. I remember that "&&" is supposed to short circuit (skip B
completely in "A && B" if A is false), but in my code it won't. So what's
the deal?

<code>
($x eq 'T') && next if value_in_list( $u, [at] listA );
($x eq 'A') && next if value_in_list( $u, [at] listB );
($x eq 'B') && next if value_in_list( $u, [at] listC );
</code>

where value_in_list() is a sub that returns TRUE if $u is found in the
list it gets passed, and FALSE otherwise.

I've tried replacing the "eq 'X'" with "=~/X/" and that doesn't help. I
even tried replacing the "&&" with "and". No joy. I still get the sub
entered for each possible value of $x unless the sub returns TRUE on a
previous test. That is, if $x is 'B', the sub gets entered for all three
possibilities, T, A, and B. I think this shouldn't be happening, but it
is (well, was, now I'm using a really ugly if-elsif-elsif). Any hints as
to why my && ain't workin' like it oughta?

TIA,

Deane Rothenmaier
Systems Architect
Walgreens Corp.
847-914-5150

"On two occasions I have been asked [by members of Parliament], 'Pray, Mr.
Babbage, if you put into the machine wrong figures, will the right answers
come out?' I am not able rightly to apprehend the kind of confusion of
ideas that could provoke such a question." -- Charles Babbage
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 Gurus,
 
 I'm not really a newbie, I have a few years of Perling, but this one's got me stumped. I remember that "&&" is supposed to short circuit (skip B completely in "A && B" if A is false), but in my code it won't. So what's the deal?
 
 <code>
 ($x eq 'T') && next if value_in_list( $u, [at] listA );
 ($x eq 'A') && next if value_in_list( $u, [at] listB );
 ($x eq 'B') && next if value_in_list( $u, [at] listC );
 </code>
 
 where value_in_list() is a sub that returns TRUE if $u is found in the list it gets passed, and FALSE otherwise.
 
 I've tried replacing the "eq 'X'" with "=~/X/" and that doesn't help. I even tried replacing the "&&" with "and". No joy. I still get the sub entered for each possible value of $x unless the sub returns TRUE on a previous test. That is, if $x is 'B', the sub gets entered for all three possibilities, T, A, and B. I think this shouldn't be happening, but it is (well, was, now I'm using a really ugly if-elsif-elsif). Any hints as to why my && ain't workin' like it oughta?
 
 TIA,
 
Deane Rothenmaier 
Systems Architect 
Walgreens Corp. 
847-914-5150 
 
"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage
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Dean,

You're going to kick yourself. :-)

> ($x eq 'T') && next if value_in_list( $u, [at] listA );

This means exactly:

if (value_in_list($u, [at] listA))
{
($x eq 'T') && next;
}

Eric
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>You're going to kick yourself. :-)
>
>> ($x eq 'T') && next if value_in_list( $u, [at] listA );
>
>This means exactly:
>
> if (value_in_list($u, [at] listA))
> {
> ($x eq 'T') && next;
> }

Please to be considering my, er, self, properly kicked! No wonder it
didn't work...

Thanks, nonetheless, for the clarification. Um, by any chance would there
be a way to make it DWIM?

Deane Rothenmaier
Systems Architect
Walgreens Corp.
847-914-5150

"On two occasions I have been asked [by members of Parliament], 'Pray, Mr.
Babbage, if you put into the machine wrong figures, will the right answers
come out?' I am not able rightly to apprehend the kind of confusion of
ideas that could provoke such a question." -- Charles Babbage
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 >You're going to kick yourself. :-) 
> 
>> ($x eq 'T') && next if value_in_list( $u, [at] listA ); 
> 
>This means exactly: 
> 
> if (value_in_list($u, [at] listA)) 
> { 
> ($x eq 'T') && next; 
> } 

 
 Please to be considering my, er, self, properly kicked! No wonder it didn't work... 
 
 Thanks, nonetheless, for the clarification. Um, by any chance would there be a way to make it DWIM?
 
Deane Rothenmaier 
Systems Architect 
Walgreens Corp. 
847-914-5150 
 
"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage
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From: activeperl-bounces [at] listserv.ActiveState.com
[mailto:activeperl-bounces [at] listserv.ActiveState.com] On Behalf Of
Deane.Rothenmaier [at] walgreens.com
Sent: 28 February 2007 15:38
To: Roode, Eric
Cc: activeperl-bounces [at] listserv.ActiveState.com;
activeperl [at] listserv.ActiveState.com
Subject: RE: another doggone newbie problem:"&&" not
short-circuitinglike itoughta

> >You're going to kick yourself. :-)
> > =

> >> ($x eq 'T') && next if value_in_list( $u, [at] listA ); =

> >
> >This means exactly:
> > =

> > if (value_in_list($u, [at] listA))
> > {
> > ($x eq 'T') && next;
> > }
> =

> =

> Please to be considering my, er, self, properly kicked! No wonder it
didn't work... =

> =

> Thanks, nonetheless, for the clarification. Um, by any chance would
there be a way to make it DWIM? =

It's not absolutly clear exactly WYM, but my first guess would be
something like:

($x eq 'T') && value_in_list( $u, [at] listA ) && next;

Or:

next if ($x eq 'T') && value_in_list( $u, [at] listA );

HTH

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Found it. Just reverse the order of the tests. Instead of

($x eq 'T') && next if value_in_list( $u, [at] listA );

use

value_in_list( $u, [at] listA ) && next if ($x eq 'T');

Can you say "counter-intuitive"???

Thanks for making me turn up the power dial on the ol' thinking cap!

Deane Rothenmaier
Systems Architect
Walgreens Corp.
847-914-5150

"On two occasions I have been asked [by members of Parliament], 'Pray, Mr.
Babbage, if you put into the machine wrong figures, will the right answers
come out?' I am not able rightly to apprehend the kind of confusion of
ideas that could provoke such a question." -- Charles Babbage
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 Found it. Just reverse the order of the tests. Instead of
 
 ($x eq 'T') && next if value_in_list( $u, [at] listA ); 

 use
 
 value_in_list( $u, [at] listA ) && next if ($x eq 'T'); 
 
 
 Can you say "counter-intuitive"???
 
 Thanks for making me turn up the power dial on the ol' thinking cap! 
 
Deane Rothenmaier 
Systems Architect 
Walgreens Corp. 
847-914-5150 
 
"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage
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Aha! Another avenue to explore. And much clearer than my second repost.
THANKS!

Deane Rothenmaier
Systems Architect
Walgreens Corp.
847-914-5150

"On two occasions I have been asked [by members of Parliament], 'Pray, Mr.
Babbage, if you put into the machine wrong figures, will the right answers
come out?' I am not able rightly to apprehend the kind of confusion of
ideas that could provoke such a question." -- Charles Babbage
--=_alternative 005779C606257290_=
Content-Type: text/html; charset="us-ascii"

 Aha! Another avenue to explore. And much clearer than my second repost. THANKS!
 
Deane Rothenmaier 
Systems Architect 
Walgreens Corp. 
847-914-5150 
 
"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage
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another doggone newbie problem:"&&" not short-circuiting like it

RE: another doggone newbie problem:"&&" not short-circuiting like

RE: another doggone newbie problem:"&&" not short-circuiting

RE: another doggone newbie problem:"&&" not

RE: another doggone newbie problem:"&&" not short-circuiting

RE: another doggone newbie problem:"&&" not short-circuiting like it