Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister

Comment on

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

A Schwartzian Transform when all you have to do is parse dates? That will make things *slower*. Creating all those arrays and references adds up.

This could speed up the sorting (because it creates few extra variables and it uses the specially optimised $a cmp $b callback):

my @sorted = map substr($_, 8), sort map join('', (/(..)-(..)-(....)/)[2,1,0], $_), @dates; # DD-MM-YYYY


my @sorted = sort { join('', ($a =~ /(..)-(..)-(....)/)[2,1,0]) cmp join('', ($b =~ /(..)-(..)-(....)/)[2,1,0]) } @dates; # DD-MM-YYYY

Schwartzian Transform:

my @sorted = map $_->[0], sort { $a->[1] cmp $b->[1] } map [ $_, join('', (/(..)-(..)-(....)/)[2,1,0]) ], @dates; # DD-MM-YYYY

In reply to Re: Sorting dates with the Schwartzian Transform by ikegami
in thread Sorting dates with the Schwartzian Transform by Wobbel

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 perusing the Monastery: (13)
    As of 2015-11-30 20:48 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (783 votes), past polls