Thanks Alex,
So, would you suggest that I familiarize myself with prolog before
venturing deeper into app development in picolisp?
I think it will be helpful for me if I could get an english translation of
this?
(?
@Nr (and *CuSuNr (cons @ T))
@Nm *CuSuNm
@Tel *CuSuTel
@Plz *CuSuPlz
@Ort *CuSuOrt
@Mob *CuSuMob
(select (@@)
((nr +CuSu @Nr) (nm +CuSu @Nm) (tel +CuSu @Tel)
(plz +CuSu @Plz) (ort +CuSu @Ort) (mob +CuSu @Mob) )
(range @Nr @@ nr)
(tolr @Nm @@ nm)
(fold @Tel @@ tel)
(head @Plz @@ plz)
(part @Ort @@ ort)
(fold @Mob @@ mob) ) )
Regards,
Kashyap
On Mon, Oct 21, 2019 at 10:00 AM Alexander Burger <a...@software-lab.de>
wrote:
> On Mon, Oct 21, 2019 at 07:12:32AM -0700, C K Kashyap wrote:
> > Finally - its good to see the values :) ... I used (show @@).
> > I see, so @@ is just a "variable" introduced in the select function - i
> got
> > a little confused by (@@) - I thought it was a function call - but looks
> > like select takes the argument unevaluated :) (love the (vi 'select) )
>
> We cannot talk about "evaluation" in Pilog, as this is no Lisp despite it
> uses
> s-expressions.
>
> It is all about "unification", i.e. values are matched with patterns
> containing
> variables. And a variable is recognized by Pilog because it starts with
> "@". In
> real Prolog variables are recognized because they start with an uppercase
> letter.
>
>
> > I noticed that the variable name has to start with @ - It does not work
> if
> > I use a name without @ - why is that?
>
> Exactly. This is how Prolog works. Perhaps you may want to look at some
> intro
> like https://www.metalevel.at/prolog - Prolog is a beast very different
> from
> other languages.
>
>
> Also, I noticed that functions in the
> > form library have their parameter names in the string format (for
> example (de
> > form ("Attr" . "Prg")) - I am curious about that too.
>
> These are transient symbols used for privacy. See
> https://software-lab.de/doc/faq.html#problems
>
> ☺/ A!ex
>
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