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  1. or download this
    my %hash = ();
$hash{'bar'} = undef;
  2. or download this
    $hash{'bar'} = '';
  3. or download this
    $hash{'bar'} = undef;

if(defined $hash{'bar'}){print "false"}
if($hash{'bar'}){print "false"}
  4. or download this
    $hash{'bar'} = '0';
if(defined $hash{'bar'}){print "true")
if($hash{'bar'}){print "false")