From: nobu.nokada@...
Date: 2004-12-03T14:18:38+09:00
Subject: Re: nested defs, what if...

Hi,

At Fri, 3 Dec 2004 14:00:44 +0900,
Gavin Sinclair wrote in [ruby-talk:122305]:
> >   class A
> >     def a(y)
> >       def b(x)
> >         x + y    # `y' in a or `undefined local variable'?
> >       end
> >       10.times{ |i| print b(i) }
> >     end
> >   end
> 
> Is there any difference between an "inner method" (with 'y' in a) and
> a lambda?

Actually, no.  Just a syntax sugar, and it would be implemented
using a lambda.  And another question; should b be visible from
other methods called from a?

> I've happily used lambdas to define private functionality before, but
> I'm concerned about efficiency:
> 
>   class A
>     def a(y)
>       b = lambda { |x| x + y }
>       10.times { |i| print b(i) }
>     end
>   end
> 
> Does the lambda attached to b get regenerated with each call to a?

I guess so.

-- 
Nobu Nakada