1. You mean just BEGIN, not sub BEGIN. You're also missing a semicolon after package foo.
  2. You should be naming your package files with extension .pm, not .pl. You also don't need to specify the extension when require- or use-ing.
  3. You define subroutine in package foo, but try to use the subroutine from package1.
  4. The biggest one: The behaviour you describe has nothing to do with BEGIN. It works just the same if you remove the BEGIN {} block.

UPDATE: AnomalousMonk points out (indirectly) that my point (4) is “only just” correct—the very early initialisation provided by BEGIN {} can certainly be useful if you might call a subroutine before some variables in it would be initialised by the normal flow of code.

In reply to Re^2: BEGIN { } block by JadeNB
in thread BEGIN { } block by bob_dobalina

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.