Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
First of all, the notation %hash = { ... is wrong. You either assign a hash with %hash = ( ... or a hash reference with $hash = { ... . Watch those parentheses and curly braces. See perlreftut and perlref for more information.

As for deleting:

#!/usr/bin/perl use Data::Dumper; $hash = { abc => { 'def' => 1, }, ghi => { jkl => 1, mno => 1, }, }; print Dumper(\$hash); delete($hash->{abc}->{def}); print Dumper(\$hash); __END__ $VAR1 = \{ 'abc' => { 'def' => 1 }, 'ghi' => { 'mno' => 1, 'jkl' => 1 } }; $VAR1 = \{ 'abc' => {}, 'ghi' => { 'mno' => 1, 'jkl' => 1 } };
The second question: I don't know :-). Having an undefined hash value is perfectly valid, so the upper level is not automatically deleted when the lower level becomes undefined. You could add a statement like delete $hash->{$key} if not keys %{$hash->{$key}}. This deletes the key only if the hash it references is empty.


In reply to Re: Deleting hash entry by Aragorn
in thread Deleting hash entry by hotshot

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 avoiding work at the Monastery: (5)
    As of 2018-12-10 10:26 GMT
    Find Nodes?
      Voting Booth?
      How many stories does it take before you've heard them all?

      Results (48 votes). Check out past polls.

      • (Sep 10, 2018 at 22:53 UTC) Welcome new users!