++, but why the complicated map games? :)

I had it without "for" first. print takes a list, map creates one. It made sense. But it all was printed on one line, so I added -l and for to make it print every item on its own line.

When it functioned correctly, I pasted it in my web browser, and formatted it. Whenever you see me write $\ = "\n"; here, it's safe to assume I used only the command line to code and test, and used -l there.

If I were to rewrite it, I'd probably have map generate strings that include \n as follows:

my $foo = 'thisisatest';
print map {
    substr((my $bar = $foo), $_, 2, reverse substr $foo, $_, 2);
    "$bar\n";
} 0 .. -2 + length $foo;
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map feels natural to me. I use it a lot, and love it.

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