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Very nice. There is one addition that I would suggest; allowing for parallel undefs in the arrays. Otherwise the iterator will reset if all the arrays happen to contain undef at the same index, even if there are more elements later in the arrays. Here's one possible solution:
sub parallel_it { my @arr_refs = @_; my $iter = 0; return sub { if (not grep $iter < @$_, @arr_refs) { $iter = 0; return; } my @return = map { $_->[$iter] } @arr_refs; $iter++; return @return; }; }

In reply to Re: looping over multiple arrays by chipmunk
in thread looping over multiple arrays by danger

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