From: Dirk Traulsen <dirk.traulsen@...>
Date: 2007-10-17T17:23:36+09:00
Subject: Re: nil.to_i returning zero

Am 17 Oct 2007 um 16:31 hat Robert Dober geschrieben:

> On 10/16/07, Rick DeNatale <rick.denatale@gmail.com> wrote:
> > On 10/16/07, Robert Dober <robert.dober@gmail.com> wrote:
> >
> > > Nevertheless one question remains, where is the border between
> > >  a += 1
> > >  a << 3
> > >  a << ( :a=>42 )
> > >  a << ?a
> >
> > For these I'd draw the border at mutating operators.
> Reasonable choice I have to admit ;)

I think this is a reasonable proposal:

class NilClass
  def +(obj)
    obj
  end
end

Can you think of any case in which this poses a problem?
It should be universally true.