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Ovid (2709)

Ovid
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Stuff with the Perl Foundation. A couple of patches in the Perl core. A few CPAN modules. That about sums it up.

Journal of Ovid (2709)

Saturday February 16, 2008
04:42 AM

Even/Odd/Prime, etc?

[ #35673 ]

I know it's on the CPAN, I just can't find it yet. I want a module which does something like this:

use Number::Properties ':all';
my @odds   = grep { odd   $_ } @num_list;
my @evens  = grep { even  $_ } @num_list;
my @primes = grep { prime $_ } @num_list;
my @negatives = grep { negative ...

You get the idea.

Is it out there?

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  • I'm of aware of something exactly like that, although I've hacked stuff similar to it over, e.g., Math::Prime::TiedArray [cpan.org] when playing at Project Euler [projecteuler.net]. In fact, gathering all those is_(prime|abundant|fibonacci|*) functions under a Number::Class (still trying to find a better name for it) module is something I want to do when I'll have truckloads of round tuits to spend (ah!).

  • perl -MNumber::Properties=prime \
         -MList::MoreUtils=lastval \
         -E '$x = lastval { prime } 2 .. Inf;
             say "the largest prime number is $x"'
    --
    rjbs