Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I'm convinced that map & grep aren't as heavily used as they could be because people don't understand them.
And because (some) people don't understand them, it's also (sometimes) hard for people to use them correctly and tell at a glance what is going on. Take, for instance, your 'using grep' example. It doesn't work (also, you are using 'eq' in one vs. '==' in the other which may make an unfair benchmark). I assume you are finding common elements but eliminating any duplicates from the output. The grep example isn't eliminating items that have already been seen because it's not keeping track of what's been seen. I think you were aiming more for this (though I assume the O(n**2) algorithm is on purpose just for demonstration purposes):
'using grep' => sub { my @common; my %seen; @common = grep { my $element1 = $_; !$seen{$element1}++ and grep { $element1 eq $_ } @array2 } @array1; },
Update: and after the fix, the benchmark doesn't favor grep nearly as much.

In reply to Re: question for perl book & magazine authors by runrig
in thread question for perl book & magazine authors by jfroebe

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 all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (7)
    As of 2018-01-23 20:31 GMT
    Find Nodes?
      Voting Booth?
      How did you see in the new year?

      Results (254 votes). Check out past polls.