Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Comment on

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

I found this tiny article a few days ago: Session Object considered Harmful

When I read the conclusion, it immediately reminded me of the assertion about the common Perl object orientation pattern (using an anonymous hash to store instance data) that Abigail strived to correct by inside out objects.

Which reminds me I have seen this antipattern elsewhere: Singletons are likely to lead to the same problem.

I’m talking about global variables – a master shape shifter concept that seems to crop up in every paradigm sooner or later, and is seldomly easy to identify for what it is at first glance – even when in retrospect, it is perfectly obvious.

The lesson I’m taking home from seeing the same concept identified so many times in so many different shapes is to constantly be on the lookout for it. It is everywhere.

(Obviously, session objects are still useful. So are singletons. So can hash based Perl objects be. Since obviously, so can globals be. But you have to be very careful and discriminating when employing them; it is easy to get them wrong.)

Update: fixed some really braindead grammar screw ups.

Makeshifts last the longest.

In reply to Falling for the same trap since 1942 by Aristotle

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 cooling their heels in the Monastery: (3)
    As of 2018-07-15 19:55 GMT
    Find Nodes?
      Voting Booth?
      It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?

      Results (326 votes). Check out past polls.