There is a Hash::Util, which is core in 5.8. There also is Hash::MoreUtils (although it doesn’t look like nearly as useful an addition as its cousin List::MoreUtils is).

I agree that having an iterator maker function handle this is the better idea, but doing it in pure Perl is not very helpful. The point of each is to avoid building a huge list – f.ex., when you’re dealing with very large DBM files, you really don’t want to use keys on them.

The code you show does not achieve this. I can’t think of any case in which I’d prefer it over a straight foreach( keys %hash ) (not even to pass the iterator around – I can just as well pass an array of keys around).

If anyone has the XS chops to take this on, it would be good idea.

Makeshifts last the longest.