I personally think that the anon-sub call back is just cleaner looking, but it has a number of other benefits. The biggest of those is that it doesn't break or force you to do ugly things if traverse is in another package.

Other benefits: you don't clutter up your symbol table with global named functions that are only intended to be used in one place. Also: you can use traverse in different ways in the same application, rather than defining the callback globally.

I also think that defining a fallback is cleaner in this case: you just check the $code arg for definedness, rather than probing the caller's package. Scope is nice and closed.

In reply to Re^3: Passing anon sub as param by fishbot_v2
in thread Passing anon sub as param by punkish

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.