[REBOL] Re: Noob with a question
From: mumpsoid:gmx at: 26-Mar-2009 6:58
On Thu, 26 Mar 2009, Carl Read wrote:
> On Wednesday, 25-March-2009 at 20:14:25 mumpsoid wrote,
>
> > Hi.....
> >
> >I'm a new-guy in the REBOLution ;)
>
> Welcome!
>
> >At 62, I may be too old to make a good REBOLutionary, but I suppose
> >that advocacy is ageless. I'm a self-taught, amateur Perl and M(umps)
> >programmer. I've also had a long, hard look at Forth. I see in REBOL
> >what appears to be "some" Forth influence. Could I be correct?
>
> Very likely. In the forward to the REBOL Official Guide Carl Sassenrath
> mentions Forth, including that he'd written a commercial version of it
> in the early 80s.
I knew it! It "feels" a little Forthish.
> >Question:
> >The manual states:
> >
> >The forall advances the variable position through the series, so when
> >it returns the variable is left at its tail:
> >
> >Therefore, the variable must be reset before it is used again:
> >
> >However. when I try it out I get:
> >
> > >>
> > >> colors: [red green blue yellow orange]
> > == [red green blue yellow orange]
> > >>
> > >> forall colors [print first colors]
> > red
> > green
> > blue
> > yellow
> > orange
> > >>
> > >> print tail? colors
> > false
> >
> >Thanks for the help and a great language!
>
> In this case, the manual you're reading is out of date. FORALL used to work
> as described there, but it was found to be of little use and that most wanted
> the blocks unchanged, resulting in a lot of code like such...
>
> forall colors [print first colors]
> colors: head colors
>
> The second line's not needed now, as you've discovered.
>
> -- Carl Read.
Thanks for the heads-up about the outdated docs. So, in summary, I can
walk through a series and leave the pointer at the "head" with `forall'.
--
Duke Normandin
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
