How can I resolve this case of “Useless use of a variable in a void context”?

Question

How can I resolve this case of \"Useless use of a variable in a void context\"?

For example:

  my $err = $soap_response->code, \" \", $soap_response-&         


        

Answer 1

my $err = join(' ', $soap_response->code, $soap_response->string) . "\n";

or, better IMO:

return sprintf "%s %s\n", $soap_response->code, $soap_response->string;

See perldoc -f join and perldoc -f sprintf perldoc perlop.

Regarding the warning, see perldoc perlop and this note on the comma operator.