[plt-scheme] Re: Thinking in FP vs OOP for large scale apps

Thanks Greg, appreciated - I understand that neither FrTime & Flapjax is
pure functional, but it allows me to think differently on how program can be
structured, and it's great to see a different way.

Thanks,
yinso

On 5/16/07, Gregory Cooper <greg at cs.brown.edu> wrote:
>
> For what it's worth, both FrTime and Flapjax interact fairly smoothly
> with their host languages' object systems.  Our paper from FLOPS '06
> tells the story with FrTime:
>
>
> http://www.cs.brown.edu/people/sk/Publications/Papers/Published/ick-adapt-oo-fwk-frp/
>
> The paper describes a strategy for wrapping sets of classes (in this
> case a GUI toolkit) so they can work with signals.  The code is
> available in the demos/gui subdirectory of the FrTime collection.  A
> similar wrapper (for the HTML document object model) is built directly
> into Flapjax.
>
> Flapjax's functional reactive values are actually Javascript objects,
> and many dataflow operations exist as prototype methods.  For example,
> to make a stream of AJAX requests based on the content of a text box,
> we can write code like this:
>
>     var linksInfoE = buildRequest(extractValue_e('userName').
>                                    filter_e(nameFilter).
>
> calm_e(500)).evalForeignScriptVal_e();
>
> This extracts the sequence of values (over time) from the 'userName'
> text box, filters out invalid names, and waits until the user stops
> typing briefly before making the request.  The result of the
> expression is the sequence of responses from the server.  One nice
> thing is that method invocations (thanks to the implicit 'this'
> parameter) allow us to "pipe together" a sequence of transformations,
> much like Unix shell scripting.
>
> Greg
>
> On 5/16/07, Matthias Felleisen <matthias at ccs.neu.edu> wrote:
> >
> > You may also want to look at the draw.* package that comes with
> > ProfessorJ and the (upcoming second volume of How to Design) Classes.
> > It is an applicative approach to some GUI programming using classes
> > and objects. Because of the implicit 'this' parameter, I consider it
> > superior to FRP.
> >
> > For now just look for teachpacks in Help Desk and follow the HtDC link.
> >
> > -- Matthias
> >
> >
> >
> >
> >
> >
> > On May 16, 2007, at 3:46 AM, YC wrote:
> >
> > >
> > > On 5/15/07, Grant Rettke <grettke at acm.org> wrote: > GUIs are a
> > > perfect example to think about using a functional solution.
> > > > So, think about it...it would be terrible!!!
> > >
> > > I think the same, but I just found that there is a style of FP
> > > called Functional Reactive Programming that purportedly models GUI
> > > more declaratively than OOP's handlers & events.  Flapjax and
> > > FrTime are working implementations of FRP.
> > >
> > > http://citeseer.ist.psu.edu/cooper04frtime.html
> > >
> > > http://www.flapjax-lang.org/
> > >
> > > http://www.haskell.org/frp/
> > >
> > > It seems that I found more links w.r.t to functional style in
> > > Haskell on the net maybe due to Haskell being pure functional...
> > >
> > > Thanks,
> > > yinso
> > >
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