Hello, all

I was just bitten by some odd behavior so I decided I'd post it here and see if it's a bug, a gotcha, or a "Why are you doing that? Stop doing that!"

#!/usr/bin/env perl
use strict;
use warnings;

my $aref = [ 'a' .. 'c' ];

warn 'ORIGINAL: $aref = ', join( q(, ), @{ $aref } );

for my $letter ( eval{ @{ $aref } } ) {
    $letter = 'z' . $letter;
}

warn 'NOT CHANGED: $aref = ', join( q(, ), @{ $aref } );

for my $letter ( @{ $aref } ) {
    $letter = 'z' . $letter;
}

warn 'CHANGED: $aref = ', join( q(, ), @{ $aref } );

[download]

What is happening or what it seems is happening is that when I loop through the elements of an array ref that was dereferenced inside of a block eval the assignment to the loop variable doesn't stick. I'm making no judgements one way or the other I'm just wondering what everyone else thinks of this. Thank you.

In reply to Reassigning $_ in loop doesn't stick by bennymack

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.