You don't need all those temporary variables in your loop, 

for (@$sur) {
    my $firstrow = join '<-->', @{$_}{qw/one two four/};
    $hash1{$_->{'three'}} .=
        $hash1{$_->{'three'}} ?
          '####'.$_->{'four'} :
          $firstrow;
}

[download]

Update: The whole loop in a single statement: 

$hash1{$_->{'three'}} .= $hash1{$_->{'three'}} ?
    '####' . $_->{'four'} :
    join( '<-->', @{$_}{qw/one two four/})
    for @$sur;

[download]
No temporaries at all.

After Compline,
Zaxo

In reply to Re: simplify the code by Zaxo
in thread simplify the code by Anonymous Monk

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