I have a sub that calls another sub.
I would like to have the called sub manipulate an array declared in the calling sub.
Below is a simplifed example of what I'm trying to do. The actual code I'm working on is a tk script.

This seems to be very expensive.

#! perl

use warnings;
use strict;

scope_test();

sub scope_test{
  my @data_in = <DATA>;
  my @data_out;
  for (0..$#data_in){
    @data_out = call_back($data_in[$_], @data_out);
  }
  print "$_" for @data_out;
}

sub call_back{
  my $element = shift;
  my @data_out = @_;
  push @data_out, $element;
  return @data_out;
}
  
__DATA__
line one
line two
line three

[download]

In reply to Attempt at eliminating a global variable by wfsp

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.