If you have several variables which require this behavior, it is convenient to write a function (str_maker) which generates the closures for you. 
use strict;
use warnings;
use feature 'say';
sub str_maker{
    my $fixed = $_[0];
    my $dynamic = \$_[1];
    my $closure = sub{
        return $fixed . ', ' . $$dynamic;
    };
    return $closure;
}
my ($aa, $bb);
my $static;

$static = 'Hello';
my $str1 = str_maker($static, $aa);
$static = 'Greetings';
my $str2 = str_maker($static, $bb);

$aa = 'Kevin';
say &$str1;     # Hello, Kevin

$bb = 'World';
say &$str2;     # Greetings World

$aa = 'Bill';
say &$str1;     # Hello, Bill

$bb = 'Aliens';
say &$str2;     # Greetings, Aliens

[download]

Minor point: $a and $b are poor choices for variable names because they may clash with variables of the same name used in sort. I used $aa and $bb instead.

Bill

In reply to Re: Evaluate variable while using by BillKSmith
in thread Evaluate variable while using by chickenman

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.