That's really the same thing as just having the file be the enclosing scope. It would be different if this were for a subroutine that returned the list. 

sub get_dirlist {
  my $dir_to_scan = shift;

  my @dirlist;
  my $wanted = sub {    
    return unless -d $_;
    push(@dirlist,$File::Find::name);
  } 

  find( $wanted, $dir_to_scan );

  return @dirlist;
}

[download]

The anonymous subroutine attached to $wanted is compiled only once, but gets a fresh copy of @dirlist for each invokation. Contrast that to this, which would continue to add to @dirlist each time the get_dirlist function was called and return a longer and longer array each time:

my @dirlist;

sub wanted {    
  return unless -d $_;
  push(@dirlist,$File::Find::name);
} 

sub get_dirlist {
  my $dir_to_scan = shift;
  find( \&wanted, $dir_to_scan );
  return @dirlist;
}

[download]

-xdg

Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

In reply to Re^2: Return values, Closure Vars from File::Find &wanted subs? by xdg
in thread Return values, Closure Vars from File::Find &wanted subs? by Subliminal Kid

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.