Beefy Boxes and Bandwidth Generously Provided by pair Networks RobOMonk
Just another Perl shrine
 
PerlMonks  

Comment on

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

-bareword is the same as "-bareword".

>perl -e "use Devel::Peek; $x="-bareword"; Dump($x); $x=-bareword; Dum +p($x)" SV = PV(0x226150) at 0x226000 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1835404 "-bareword"\0 CUR = 9 LEN = 12 SV = PV(0x226150) at 0x226000 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1835404 "-bareword"\0 CUR = 9 LEN = 12

There's nothing special about -Infinity.

>perl -e "use Devel::Peek; $x="-Infinity"; Dump($x); $x=-Infinity; Dum +p($x)" SV = PV(0x226150) at 0x226000 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1835404 "-Infinity"\0 CUR = 9 LEN = 12 SV = PV(0x226150) at 0x226000 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1835404 "-Infinity"\0 CUR = 9 LEN = 12

A string that doesn't look like a number is the same as 0 in a numerical context (although it will give a warning if warnings enabled).

The index expression of an array is evaluated in a numerical context.

So they both print 5.

>perl -e"@a = (5 .. 10); print qq{$a['Infinity']\n$a[-Infinity]\n};" 5 5

Update: There appears to be a bug. 'Infinity' and -Infinity don't trigger the warning.


In reply to Re: $array[ 'Infinity' ] by ikegami
in thread $array[ 'Infinity' ] by Sixtease

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (6)
    As of 2014-04-19 05:14 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (478 votes), past polls