How should I delete hash elements while iterating?

Question

I have fairly large hash (some 10M keys) and I would like to delete some elements from it.

I usually don\'t like to use delete or splice, a

Answer 1

How about this:

my %to_delete;

foreach my $key (keys %hash) {
    if (should_be_deleted($key)) {
        $to_delete{$key}++;
    }
    # add some other keys the same way...
}

delete @hash{keys %to_delete};