Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Declaring variables once at the beginning of the code block where they are being first used is the best practice imo. One other alternative (yet poor) approach is to use the special $_ variable.
if ( $_ = $obj->get_id() ) { # use $_ inside this block... $obj->do_this(); } elsif ( $_ = $obj->create_id() ) { # use $_ inside this block $obj->do_that(); } else { $obj->do_somethingelse(); }
Generally, however, this wouldn't be a very sound approach, as it is usually very easy to loose track of the $_ variable. Although, it does spare you having to declare variables, especially for short code blocks or loops.

Update: As ikegami pointed out (++), I stress that the use of $_ is a bad idea. I just wanted to show one alternative, albeit a bad one as a means of warning against such approach. :)
"We've all heard that a million monkeys banging on a million typewriters will eventually reproduce
the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true." - Robert Wilensky, University of California

In reply to Re: scoping question by vladb
in thread scoping question by nmerriweather

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!
  • 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 the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (4)
    As of 2015-10-09 05:17 GMT
    Find Nodes?
      Voting Booth?

      Does Humor Belong in Programming?

      Results (233 votes), past polls