After a couple of years of doing other stuff, I finally got around to self-publishing that rather obscure text on "Exploring Programming Language architecture in Perl". The book is available on Lulu at http://www.lulu.com/content/hardcover-book/exploring-programming-language-architecture-in-perl/7839921. I'm not making any profit from this, and it's also available as a download PDF if you don't want to shell out for a hard copy.

I had a lot of fun writing it, but have kind of moved on since. So enjoy.

perl -e 'print sub { "Hello @{[shift->()]}!\n" }->(sub{"World"})'
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