The only problem is closed-over variables...

use strict;
use warnings;
use B::Deparse;

sub make_multiplier {
    my $n = shift;
    return sub { $n * $_[0] };
}

my $double = make_multiplier(2);
my $treble = make_multiplier(3);

print "double and treble clearly do different things...\n";
print "double 5: ", $double->(5), "\n";
print "treble 5: ", $treble->(5), "\n\n";

my $deparse = B::Deparse->new;
$deparse->ambient_pragmas(strict => 'all', warnings => 'all');

print "yet, here is the B::Deparse output for double...\n";
print $deparse->coderef2text($double), "\n\n";

print "and here is the B::Deparse output for treble...\n";
print $deparse->coderef2text($treble), "\n";

__END__
double and treble clearly do different things...
double 5: 10
treble 5: 15

yet, here is the B::Deparse output for double...
{
    $n * $_[0];
}

and here is the B::Deparse output for treble...
{
    $n * $_[0];
}

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^2: Compare CODE by tobyink
in thread Compare CODE by PetaMem

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.