Another solution is to abandon each on account of its side effects and say, 

sub find_stuff {
    my $self = shift;
    $self->{$_}->{'blablah'}
        and return $_ for keys %$self;
    return;
}

[download]

Update: Ok, here's another, 

sub find_stuff {
    my ($self, $k) = shift;
    while (defined($k = each %$self)) {
       last if $self->{$k}->{'blablah'}
    }
    1 while each %$self;
    $k
}

[download]
You can't avoid going through all the keys one way or another.

After Compline,
Zaxo

In reply to Re: Optimization, side-effects and wrong code by Zaxo
in thread Optimization, side-effects and wrong code by cbraga

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