The context around &return_value differs.

Other than its memory space and the time taken to create it, what concerns you about the lvalue? Unless there is more I wouldn't call this a side-effect, as many things are implemented with intermediate lvalues. Am I missing something?

Having not talked much about 'lvalues' it is possible that my usage is baroque. I'd say altering a named value inadvertently is a side-effect. Your usage just seems extremely strict: like saying creating $main::val has the side-effect of creating a whole typeglob. Is this type of usage common? I see its correctness and how compiler writers would use it as I understand your usage here.

I agree with your preference, but I have never used or seen the do2dollar_ for ($var); constructions you have been talking about. I dislike assigning $stuff as the last operation. It just doesn't read well, the invisible $_ seems much better used in the second version. So again I ask, what are the reasons for your preference?

I am going to read this thread to find out more about this usage of for. My first reaction is suspection but I also like a less indented style of coding. 

#!/usr/bin/perl -w
use strict;

sub return_value {
        return ""  unless wantarray;
        return ("this is a value", "xxx", "yyy", "zzz") ;
};

my $stuff;
for ( return_value() ) {
    chomp;
    s/foo//g;
    tr/x/y/;
    $stuff = $_;
}
print "\$stuff >$stuff<\n";

$stuff = return_value();
for ($stuff) {
    chomp;
    s/foo//g;
    tr/x/y/;
}
print "\$stuff >$stuff<\n";

# the output
__DATA__
$stuff >zzz<
$stuff ><

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In reply to (Re:)+ Using $_ as a temp var, especially in functions by rir
in thread Using $_ as a temp var, especially in functions by BUU

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