Goofy question #7234

[Mike Kerner]

In the newfangled LC world, you can even do things the way the engine can -
using "return for value" (or just "return") and "return for error" to allow
commands to return values, too.  Then "it" gets values that are returned,
and "the result" gets errors that are returned.  9 is fun.
 funfunfunfunfunfunfun

On Mon, Jul 10, 2017 at 4:29 AM, Tore Nilsen via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Here is what I teach my students:
>
> Use the function to return a value to the calling handler, set the
> properties in the handler, not in the function itself, like this:
>
> on mouseUp
>  set backgroundColor of this card to goRed()
> end mouseUp
>
> function goRed
>   return “red”
> end goRed
>
> The benefit of this is that you can call the function from various
> handlers and sending whatever parameter you like. Here is a script that
> returns different colours
> depending on which card you open when you call the function. Everything is
> placed in the stack script:
>
> on preOpenCard
>  put short name of this card into tCard
>  set backgroundColor of card tCard to setColour(tCard)
> end preOpenCard
>
> function setColour pCard
>  if pCard = “One” then
>    return “red”
>  else
>    return “blue”
>  end if
> end setColour
>
>
> Regards
> Tore Nilsen
>
> > 10. jul. 2017 kl. 10:09 skrev Tim Selander via use-livecode <
> use-livecode at lists.runrev.com>:
> >
> > Hi Richmond
> >
> > This works (both scripts in the button):
> > on mouseUp
> > put goRed()
> > end mouseUp
> >
> > function goRed
> > set the backGroundColor of card 1 to red
> > end goRed
> >
> > I think the general idea is that a function returns information. So
> date() returns the date. But just having a line "date()" in the script
> causes an error because you haven't told it what to do with the info being
> returned. So you need "put data()" and then the info will go to the message
> box.
> >
> > Your function doesn't return any data. That's your choice when you write
> it. But the engine is still expecting a function to return info, so you
> still have to say "put" trigger the function.
> >
> > You could write your function with a parameter:
> > function goRed foo
> > set the backGroundColor of foo to red
> > end goRed
> >
> > Then call the function like this:
> > put goRed("card 1")
> > put goRed("card 3")
> > etc., and the one function can be used to turn both card 1 and card 3
> (and any other object you specify in foo) red.
> >
> > Hope that helps.
> >
> > Tim Selander
> > Tokyo, Japan
> >
> >
> >
> >
> >
> > On 7/10/17, 15:48, Richmond Mathewson via use-livecode wrote:
> >> I am obviously missing something . . .
> >>
> >> . . . so badly so that I've been trawling Danny Goodman's "Complete" HC
> 2 . . .
> >>
> >> and NOT getting 'it' . . .
> >>
> >> SO: one can set up a custom command:
> >>
> >> on GoRed
> >>  set the backGroundColor of card 1 to red
> >> end GoRed
> >>
> >> and one can call it:
> >>
> >> on mouseUp
> >>   do GoRed
> >> end mouseUp
> >>
> >> and one can set up a custom function:
> >>
> >> function GoRed
> >>  set the backGroundColor of card 1 to red
> >> end function
> >>
> >> Now: is the reason I cannot call that function because it takes NO
> parameters?
> >>
> >> Richmond.
> >> _______________________________________________
> >> use-livecode mailing list
> >> use-livecode at lists.runrev.com
> >> Please visit this url to subscribe, unsubscribe and manage your
> subscription preferences:
> >> http://lists.runrev.com/mailman/listinfo/use-livecode
> >>
> >
> >
> > _______________________________________________
> > use-livecode mailing list
> > use-livecode at lists.runrev.com
> > Please visit this url to subscribe, unsubscribe and manage your
> subscription preferences:
> > http://lists.runrev.com/mailman/listinfo/use-livecode
>
>
> _______________________________________________
> use-livecode mailing list
> use-livecode at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your
> subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-livecode
>



-- 
On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."