Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

comment on

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

Which construct is preferred, and why?

# I am looking for hosts that appear in all of a set of SQL tables. # I keep a table count and increment the count for a host for each tab +le in # which it occurs. # Then I clean out those that were not in all tables. # Faked data my %hosts = ( a => 3, b => 3, c => 4, d => 3, e => 2, f => 3, g => 3, ); my $table_count = 3; # This: do {delete $hosts{$_} unless $hosts{$_} == $table_count} for keys %hos +ts; # or This: map {delete $hosts{$_} unless $hosts{$_} == $table_count} keys %hosts;
Or is there a better way to do it?


Pereant, qui ante nos nostra dixerunt!

In reply to map {} list or do {} for list? by Random_Walk

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 wandering the Monastery: (4)
    As of 2020-11-26 23:54 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found