>>>>> "DC" == Damian Conway <[EMAIL PROTECTED]> writes:
DC> I'm not sure how this would affect the proposal. If an item in the
DC> list being reduced is undef, it appears in the reduction
DC> subroutines arg list as undef. The reduction subroutine can then
DC> handle it (or not) as it chooses.
DC> For example, to short-circuit if the reduction ever becomes undef:
DC> $sum = { defined $_[0] or last; $_[0]+$_[1] } 0, @numbers;
Actually, it would be easier to do in reduce, the undefs should
simply be ignored.
Otherwise having the user code it, becomes
{ defined $_[0] && defined $_[1] ? $_[0] + $_[1]
: defined $[0] ? $_[0] : $_[1] }
Pretty ugly.
And for the N case, it gets even uglier. So reduce should be able
to supply the next N-1 defined() values.
<chaim>
--
Chaim Frenkel Nonlinear Knowledge, Inc.
[EMAIL PROTECTED] +1-718-236-0183
