Re: Undefined vs empty string

[Athanasius]

undef and "" are indeed different in Perl, but both are boolean false, so the test can be simplified to:

if (!$string) {
}

See perlsyn#Truth-and-Falsehood.

Update: Except that "0" is also false, so if that’s a possibility, prefer BrowserUk’s solution, below.

Hope that helps,