It has just occurred to me that the digit check might only be there because you were using a buggy for loop. If so, the solutions are much simpler.

for: 

my @fulls;
for my $area (@areas) {
    for my $short (@shorts) {
        push @fulls, "$short.area$area";
    }
}

[download]

map: 

my @fulls =
    map { my $area = $_; map "$_.area$area", @shorts }
    @areas;

[download]

More intuitive map, but different order produced: 

my @fulls =
    map { my $short = $_; map "$short.area$_", @areas }
    @shorts;

[download]

NestedLoops: 

use Algorithm::Loops qw( NestedLoops );

my @fulls = NestedLoops(
    [ \@areas, \@shorts ],
    sub { "$_[1].area$_[0]" },
);

[download]

In reply to Re: Can map or splice replace my use of for loop + push + grep for my array transmogrification? by ikegami
in thread Can map or splice replace my use of for loop + push + grep for my array transmogrification? by jffry

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.