Re^2: Burned by precedence rules

[GrandFather]

Many would find that better expressed as:

sub done {
    my $self = shift;

    return 1 unless $self->foo or $self->bar;
    return;
}

because it avoids the two negations which confuse the meaning of the and.

I used to avoid using unless, partly because none of the other languages I've used have had such a thing, but where it drops out a layer of negation I find it helps clean up intent quite nicely.