在 2010-01-19二的 01:54 +0900，Colin Bartlett写道：
> On Mon, Jan 18, 2010 at 3:44 AM, Ruby Newbee <rubynewbee / gmail.com> wrote:
> > For this statement:
> >   @speaks_english ||= @name.size > 6
> > does it mean something like below?
> >   if @name.size > 6
> >      @speaks_english ||= @name.size
> >   end
> 
> As an addition to the other replies to your question, there is a useful
> post on this by Rick DeNatale, see below.
> Rick DeNatale also notes that x &&= y behaves similarly - it means:
>   x && (x = y)
> 
> I've emphasized the last sentence below because although
> I know the real meaning of ||= the point that it preserves
> the short-circuit nature hadn't occurred to me, and I think
> it's a useful help to remembering exactly what ||= does.
> 
> http://talklikeaduck.denhaven2.com/2008/04/26/x-y-redux
> 

For those people who were coming from Perl, ||= is a pretty clear
operator, :)