LanX has asked for the wisdom of the Perl Monks concerning the following question:

Hi

use warnings activates a check for typos in package variables.

Any chance to have the same for lexicals, which are never used?

To be more precise ... I want help to indentify code snippets which have become useless.

Any ideas?

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

Replies are listed 'Best First'.
Re: "Only Used Once" warning for lexicals
by toolic (Bishop) on Aug 06, 2015 at 13:38 UTC
    perlcritic can identify a lexical variable which was declared with my, but was never set or used: 
    use strict;
use warnings;

my ($unused, $i, $j);
$i = $j; # uninitialized

__END__

"$unused" is declared but not used at line , column 1.
Unused variables clutter code and make it harder to read.  (Severity: 
+3)

    [download]

    See also:

[reply]
[d/l]
Re: "Only Used Once" warning for lexicals
by Athanasius (Archbishop) on Aug 06, 2015 at 13:30 UTC
[reply]
[d/l]
      warnings::unused claims itself unmaintained and recommends Test::Vars by the same author.
      لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
[reply]
[reply]
[d/l]

Back to Seekers of Perl Wisdom