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my %foo;
@foo{qw/ foo bar baz /} = 1 .. 3;
while (%foo) {
...
    my $val = delete $foo{$key};
    printf "%s => %s is gone.\n", $key, $val;
}

my %foo;
@foo{qw/ foo bar baz /} = 1 .. 3;
my @keys = keys %foo; 
...
    my $val = delete $foo{$key};
    printf "%s => %s is gone.\n", $key, $val;
}

while (my ($key, $val) = each %hash) {
    delete $hash{$key};
    printf "%s => %s is gone.\n", $key, $val;
}