From: Trans <transfire@...>
Date: 2007-01-14T02:46:06+09:00
Subject: Re: return_on


Pit Capitain wrote:
> Trans schrieb:
> > I don't really have any examples that are repleat with it, but as to
> > insight it's especially convenient when caching a return value:
> >
> >   def x
> >     return_on @cache[:x]
> >     # do stuff
> >     @cache[:x] = result_of_stuff
> >   end
> >
> > this gets rid of an extraneous variable too b/c otherwise, the more
> > efficient impl. is:
> >
> >   def x
> >     r = @cache[:x]
> >     return r if r
> >     # do stuff
> >     @cache[:x] = result_of_stuff
> >   end
>
> You could also implement this as
>
>    def x
>      @cache[:x] ||= (
>        # do stuff
>        result_of_stuff
>      )
>    end

That pretty good. I rarely use ( ) as local encapsulator and probably
should consider it more often. I'm generally partial to less indention
when I can get it though.

Thanks,
T.