while (($key, $val) = each(%hash)) {

}

# or by:
foreach (keys(%hash)) {

}

##</code><code>##

# if I have
my @arr = keys(%hash);
# and @arr is for example: qw(4 7 2 1 9)

# I would expect to get somehow
@backwardsArr = qw(9 1 2 7 4);