Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
From perlsyn#Foreach Loops

       Otherwise, the variable is
       implicitly local to the loop and regains its former value upon exiting
       the loop.  If the variable was previously declared with "my", it uses
       that variable instead of the global one, but itís still localized to
       the loop. 

If you also check the references you will see that the '$i' are pointing to different locations.

use strict; use warnings; $,=","; $\="\n"; my $i = 6; sub my_print { print $i,\$i; } ; for $i (qw|x y|) { my_print(); print " (Perl Style:\$i==$i)",\$i,"\n"; }
6, SCALAR(0x8fa4e38) (Perl Style:$i==x), SCALAR(0x8f86760), 6, SCALAR(0x8fa4e38) (Perl Style:$i==y), SCALAR(0x8fa4da8),

That's why PBP says to always use lexical loop vars in foreach!

Cheers Rolf

In reply to Re^3: foreach-loop-local var in sub by LanX
in thread foreach-loop-local var in sub by warshall

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others examining the Monastery: (6)
    As of 2018-04-23 09:00 GMT
    Find Nodes?
      Voting Booth?