http://www.perlmonks.org?node_id=11127549


in reply to Re^2: Index or iterate - your choice
in thread Index or iterate - your choice

I did consider including that, but by providing a tied array, you're kind of encouraging end users to treat it as any old array.

So they might not consider that doing something like:

foreach my $item ( reverse @array ) { ... }

Is going to impact performance way more than they might expect.

If it's exposed as an iterator, then it encourages them to access items in a one-at-a-time sequential fashion. They still can slurp it all into an array, but they can't blame you when that eats up all their memory.

Not saying it's never a good idea, but situations where it is aren't going to be that common.