Thanks. But that's what I don't get. Here's my confusion. I never realized that a simple loop like this (an even simpler illustration this time) ... 

    for (my $i=0; $i <=1; $i++){
        my @a;  
        $a[$i] = 99;
        print Dumper(\@a);
    }

[download]

... which results in ...

$VAR1 = [
          99
        ];
$VAR1 = [
          undef,
          99
        ];

...actually allocated and destroyed a new array every time through the loop. Since you go around the loop twice, it seems like you don't "leave" the scope in which @a was delcared, so @a should still "be there" during the second iteration. I still don't get that.

Also, I still don't understand why the 'wrong' version creates the data structure that it does. Any thoughts on that one?
{}think; #Think outside of the brackets

In reply to Re^2: Scope and references by {}think
in thread Scope and references by {}think

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.