Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister

Comment on

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


> Consider the relative difficulty of fixing your problem case vs. my counter-factual problem case:

while(  $x  = shift @a ) {    # Fixed

this is not a fix because while stops, if any element of @a is false.

DB<187> @a=(1,undef,2,3,0,4,5) DB<188> print $x while $x =shift @a 1 DB<189> print $x while $x =shift @a 23 DB<190> print $x while $x =shift @a 45 DB<191> print $x while $x =shift @a

Thats the old semipredicate problem, which can only be solved with list-assignments.

But I agree with you that it's most probably too late to fix that design decision...

Cheers Rolf

( addicted to the Perl Programming Language)

) for completeness: no defined doesn't help here, if undef is a legal value.

  • corrected "semipredicate problem"
  • improved code example
  • your "better" update is indeed better

) best answer so far

In reply to Re^2: shift in list context buggy? (best answer so far!) by LanX
in thread shift in list context buggy? by LanX

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 the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others romping around the Monastery: (3)
    As of 2015-11-27 04:39 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (718 votes), past polls