Re: [Vala] Suggestion: first {} and last {} operators in iteration-loops

["David Keijser" <keijser gmail com>]

On 9/7/07, Alberto Ruiz <aruiz gnome org> wrote:
> 2007/9/7, Jürg Billeter <j bitron ch>:
> > On Fri, 2007-09-07 at 11:51 +0200, Raphael Bosshard wrote:
> >
> > Thanks for your suggestion. Special treatment for the first and/or the
> > last element is certainly used quite often, however I'm not sure that
> > first{} and last{} would fit in well enough into the syntax. I also
> > don't know of other programming languages providing something similar,
> > so it might actually be more confusing than helping like that. Maybe
> > there is another way to assist when you need to treat the first and/or
> > the last element in an iteration specially.
>
>
> I think it would be better to provide negative index support for arrays
> (array[-1]) and use a for loop that excludes the first and last item just in
> case you need special treatment for first and last rather than extending the
> language in such a strange way.
>
>
> --
> Un saludo,
> Alberto Ruiz
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Another solution may be to give access to the internal iterator with
eg. '_iter'. That way you at least don't need to create your own
counter. The problem is of course when iterating over a linked list or
similar where you normally don't have a counter.