On 11/12/2018 3:54 PM, Matthias Felleisen wrote:
> On Nov 12, 2018, at 2:22 PM, George Neuner <gneun...@comcast.net> wrote:
>
>> PS: Why do web-servers need CPS?
>
> In general they don't.
They need continuations, because BACK buttons, cloning of TABs and similar
actions force a control flow on interactive web programs that is easily
explained and programmed via first-class continuations (which can be modeled,
among other things, with CPS).
I agree re: *explaining* the behavior in the browser. I don't
necessarily agree that either side needs continuations in order to
*implement* the behavior. Nor do I agree that persisted continuations
are the best way to do it.
I am happy to be persuaded, but I seriously doubt you can do it.
Since most PLs do not support first-class continuations, programmers of
interactive web-server plugins to manually encode this flow of control, which
is done via partial CPS conversion.
Examples?
You can now think about how well most programmers are prepared for this via
their undergraduate training and you get the idea why interactive servlets were
often broken. Web client frameworks have eliminated some of this problem (but
suffer from their own, which aren’t unrelated to continuations either).
Most code breaks because it was written by people who should not have
been coding. The skill level of the average software "developer" today
is only slightly above novice. Somewhere along the line, too many have
gotten the idea that software development is about coding rather than
about architecture, and that it is easy enough to be done successfully
by self taught hackers without needing a CS degree. News Flash: some
things can be done that way ... most things can't.
Full stack web development is a multi-discipline area that demands a
high level of knowledge and skill to architect a working application.
IMO, the vast majority of all web developers are not qualified to be
doing it.
George
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