> -----Original Message-----
> From: Luke Palmer [mailto:[EMAIL PROTECTED]
> Sent: Thursday, August 17, 2006 8:44 PM
> To: Perl6 Language List
>
> Wasn't NEXT supposed to do something tricky, such as being mutually
> exclusive with LAST? I remember a debate some time ago where some
> complained "but that would be hard to implement", and the solution
> being mostly correct but failing in this case.
>
> I seem to recall NEXT being created in order to do things like this:
>
> for @objs {
> .print;
> NEXT { print ", " }
> LAST { print "\n" }
> }
>
> We also might consider using perl6's hypothetical features to
> implement NEXT correctly in all cases (except for those cases where
> the loop update condition cannot be hypotheticalized).
Is this even possible? This would require Perl to know which iteration is
going to be the last one. In many cases there is no way to know this:
repeat {
$num = rand;
print $num;
NEXT {print ',';}
LAST {print "\n";}
} while $num < 0.9;
If rand is a true random-number generator it would take a time machine to
determine whether to call NEXT or LAST.
(Sorry for the double post.)
Joe Gottman
