I wondered whether using abs to get absolute value then making one comparison rather than two would be quicker. Apparently not.

use strict;
use warnings;

use Benchmark qw{ cmpthese };

my @data =
   map { rand( 20 ) * ( 1, -1 )[ int rand 2 ] }
   1 .. 1e6;

cmpthese(
   -10,
   {
       abs => sub { my @arr = grep { abs $_ <= 10 } @data },
       two => sub { my @arr = grep { $_ >= -10 and $_ <= 10 } @data },
   }
   );

[download]
      Rate abs two
abs 5.11/s  -- -9%
two 5.62/s 10%  --

[download]

Cheers,

JohnGG

In reply to Re: Remove line from file based on numeric column value by johngg
in thread Remove line from file based on numeric column value by Bama_Perl

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!
  • 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, details, 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, summary, 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.