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All the Perl that's Practical to Extract and Report

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  • ...continuation-based web frameworks

    Continuations are one of the things (among others, I'm told) that Ruby borrowed from Lisp. At least one framework, Borges [], uses continuations as a way to deal with state.

    Unfortunately, I'm not one of those people smart enough to figure out how I can use continations to my advantage in daily work.

    • by brev (1827) on 2004.07.05 13:57 (#32148)

      Almost every web app spends most of its time just recreating a state that it understands. And the logic of transitions between pages have to be unrolled into a big switch statement up front.

      If perl 7 had continuations, you could do this:


      # website that sells t-shirts

      $user =;


      if ($user.t_shirts) {
         show_shirts();  # each shirt has a buy button
         if ($user.show_close_up) {
             show_close_up($user.shirt_id);  # also shows buy button
         if ($ {
             if ($$user.shirt_id)) {
             } else {

      Continuation frameworks aren't a panacea--they run into trouble when dealing with world outside their interaction model. But you can see why they excite some people.

      N.B. it's not just about multi-page forms either. Check out Borges or Seaside for the details.