Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

Comment on

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

One option is to short circuit the autovivification:

use strict; use warnings; my %Hash; $Hash{44.52}{param1}{key1} = [ 101.01, 'val1' ]; $Hash{95.01}{param2}{key2} = [ 101.02, 'val2' ]; my $neededVal = 80.0; if ( exists $Hash{$neededVal} and exists $Hash{$neededVal}{param1} and exists $Hash{$neededVal}{param1}{key1} ) { print "DEFINED"; } else { for ( keys %Hash ) { print "$_\n"; } }


95.01 44.52

Update I: Added the needed defined, in case of an earlier (for example) $Hash{$neededVal}{param1}{key1} = 0.

Update II: Replaced defined with exists. Thank you, choroba.

In reply to Re: Checking if hash value exists without implicitly defining it by Kenosis
in thread Checking if hash value exists without implicitly defining it by Doctrin

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?

    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 drinking their drinks and smoking their pipes about the Monastery: (11)
    As of 2015-03-27 16:05 GMT
    Find Nodes?
      Voting Booth?

      When putting a smiley right before a closing parenthesis, do you:

      Results (613 votes), past polls