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I remember being shown call/cc briefly in CS 61A at Berkeley and then forgetting about it until recently when I saw an article on it while I was in the middle of writing an event-driven web application using Perl and Plack. I immediately saw how useful it would be and wished I had it available to use there.

Ruby has call/cc

http://rubydoc.info/stdlib/core/1.9.3/Kernel:callcc

Thus you can implement pretty much anything you want in ruby, including COME FROM.

Please explain :)

Good explanation here: http://lambda-the-ultimate.org/node/86#comment-3806

But you have to read it slowly.

Mine lisp-peen is too small.

Now, off to study!

Thanks, btw.

I don't think I ever really understood call/cc until I read Lisp in Small Pieces. The author makes a great effort to implement call/cc in each of the interpreters and compilers he presents, and examines the hairy issues that come up when you decide to support first-class continuations.

Highly recommended.