|-----Original Message-----
|From: Ing. Branislav Gerzo [mailto:[EMAIL PROTECTED]
|Sent: Friday, April 29, 2005 7:11 PM
|To: beginners@perl.org
|Subject: Re: REGEXP removing - il- - -b-f and - il- - - - f
|
|
|[EMAIL PROTECTED] [D], on Friday, April 29, 2005 at 09:30 (-0400)
|wrote about:
|
|DOc> well, I am trying to get beyond a beginner as I have doing Perl for 3
|DOc> years now so is your answer still the same?
|
|I think really good programmers write "nice" readable programs
|(scripts), so begginers should understand that sooner. I think, that's
|why better using "or" instead "||".
|
'||' and 'or' have different precedences. Some important operators which
have a higher precedence than 'or' but lower precedence than '||' are the
comma operator, the assignment operator, '=>'(dunno what this operator is
called in Perlism).
Code involving these operators will break if you simply assume that the
difference between '||' and 'or' is only style.
eg
$var = $a || $b
$var = $a or $b ##there you go
open A,"$file" or die("$! : whoopsie!!")
open A,"$file" || die("$! : whoopsie!!")
or in a more wierd manner, where unbeknownst to you, the entire context of
evaluation changes.
##code starts
use strict ;
use warnings ;
sub sub_returns_array {
return wantarray() ? qw/abc def crf/ : "scalar returned :-/" ;
}
my @arr1 = sub_returns_array || die ;
my @arr2 = sub_returns_array or die ;
print "arr1 : @arr1\n" ;
print "arr2 : @arr2" ;
##code ends
Manav
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