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) )
I noticed that the variable name has to start with @ - It does not work if
I use a name without @ - why is that? 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.
Regards,
Kashyap
On Mon, Oct 21, 2019 at 6:42 AM Alexander Burger <a...@software-lab.de>
wrote:
> On Mon, Oct 21, 2019 at 06:16:41AM -0700, C K Kashyap wrote:
> > Thank you Alex,
> > I get the following when I run the (?) - for which I defined a function
> XX.
>
> Good.
>
> > I do see that I get back 1 record when *CuSuNm is "Oaks" and 3 records
> when
> > *CuSuNm is "". However, I don't see the actual values - except for @Nm.
>
> > @Nr=NIL @Nm="Oaks" @Tel=NIL @Plz=NIL @Ort=NIL @Mob=NIL @@={C2}
>
> Yes. '?' shows all unified Pilog variables. As the object is bound to
> '@@', we
> see '{C2}' but that's not so very helpful.
>
> You can use the 'show' predicate to view them:
>
> : (? ... (select (@@) ...) (show @@))
>
> or pick individual properties
>
> : (? ... (select (@@) ...) (val @Nm @@ nm) (val @Tel @@ tel))
>
> then '@Nm' and '@Tel' will be unified to the proper values and shown in the
> results.
>
>
> > While at it, could you also explain the @/@@ convention? Is there a doc I
> > could read for this?
>
> '@@' is just the implicit variable used in the GUI. Outside of GUI usage
> you can
> use any name, e.g.
>
> : (? ... (select (@CuSu) ...
>
> ☺/ A!ex
>
> --
> UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
>
