Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I suppose taking references might save memory, but it doesn't save any time over this (on small or large lists):
[snip]
I get about 16% better than the List::Util version (YMMV).

Indeed I was about to yell: "well, but then let's just adapt BrowserUk's version simply removing the referencing and dereferencing":

sub bzr (@) { my @a = @_; my $n; my $i = @_; map +($n=randi($i--), $a[$n], $a[$n]=$a[$i])[1], @_; }

But that won't work any more! (So kids don't copy the code above, it's crap! ;-) OTOH if I compare your code (as 'run') with BrowserUk's, I get:

Rate run buk run 7467/s -- -12% buk 8454/s 13% --

So that seems the best both speed and possibly memory wise.


In reply to Re^2: About List::Util's pure Perl shuffle() by blazar
in thread About List::Util's pure Perl shuffle() by blazar

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 chanting in the Monastery: (7)
    As of 2014-10-21 07:05 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      For retirement, I am banking on:










      Results (98 votes), past polls