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Postings from November 2003
Gordon Henriksen writes:
> Larry Wall wrote:
>
> > On Tue, Nov 18, 2003 at 06:28:59PM -0500, Gordon Henriksen wrote:
> >
> > > my @b = for @a -> $_ {
> > > ...
> > > }
> >
> > That will be a syntax error. Generators are too mind-stretching to
> > inflict on novices [...]
>
> I making the point that within the context of this we-wish-loops-were-
> expressions discussion, the "for expression" was simply another way
> to spell map, at least when autoiterating an array.
>
> I certainly wasn't thinking in terms of coroutines--they absolutely
> deserve a large syntactic barrier.
I don't think generate{} and yield() were supposed to indicate
coroutines. Instead, it's more like Mathematica's Sow[] and Reap[],
which would work (Perl6-ized) as follows:
@a = reap {
sow 1;
some-other-statement;
sow 2;
} # @a is (1,2)
It's a nice concept; it simplifies certain kinds of list processing
greatly. It would easily be implemented with coroutines, which might
also explain the yield().
Luke
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