Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Comment on

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

Except map is painfully slow in void context:

use strict; use warnings; use Benchmark qw( cmpthese ); my @list = map { '' . int(rand(100)) } 1..1000; sub map_test { my %counts = (); map { ++$counts{$_} } @list; 1; } sub foreach_test { my %counts = (); ++$counts{$_} for @list; 1; } cmpthese(-3, { map => \&map_test, foreach => \&foreach_test, });
This is perl, v5.6.1 built for MSWin32-x86-multi-thread Rate map foreach map 953/s -- -25% foreach 1278/s 34% --
This is perl, v5.8.0 built for MSWin32-x86-multi-thread Rate map foreach map 1705/s -- -25% foreach 2288/s 34% --
This is perl, v5.8.0 built for i386-freebsd Rate map foreach map 847/s -- -29% foreach 1190/s 40% --

This may have been fixed since.


In reply to Re^2: Count and List Items in a List by ikegami
in thread Count and List Items in a List by Tech77

Title:
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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (8)
    As of 2014-11-26 03:02 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My preferred Perl binaries come from:














      Results (160 votes), past polls