Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options

Comment on

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

Perhaps you could change the way you build your Dataobject. Instead of one array of hashes, you could build four hashes of (arrays of) hashes, each with a different field as the key. So, you could for example build a HoAoH with surname as key:

%Persons_by_surname = ( 'Schwartz' => [ { ..person 1 }, { ..person 2}, ], 'Wall' => [ {..person 1..} ] );

And the same for the other fields (except perhaps for age, where there will be a limited number of discrete values). Instead of looping over an array, this changes your algorithm to a hash lookup, which should be faster.

To facilitate your later lookup phase, you could put these data hashes in a wrapper hash like this:

my %data= ( 'surname' => \%Persons_by_surname, 'firstname' => \%Persons_by_firstname, # ... and so on );

Doing this, you'll have an initial hit on performance when building the extra hashes, but you should have faster lookups in the end. You'll have to benchmark your scripts to see whether this is worth it.


In reply to Re: Fast seeking in a large array of hashes to generate a report. by robartes
in thread Fast seeking in a large array of hashes to generate a report. by jbrugger

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 not a whimper to be heard...

    How do I use this? | Other CB clients
    Other Users?
    Others examining the Monastery: (10)
    As of 2018-06-22 17:40 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (124 votes). Check out past polls.