From: Paolo Negri <hungrylist@...>
Date: 2006-10-04T16:58:05+09:00
Subject: Re: eval confusion

Thank you for replying and for the note on 1.9 very interesting!

Paolo

On 04/10/06, nobu@ruby-lang.org <nobu@ruby-lang.org> wrote:
> Hi,
>
> At Wed, 4 Oct 2006 08:00:32 +0900,
> Paolo Negri wrote in [ruby-talk:217920]:
> > #!/bin/ruby
> > class DefMethod
> >   M_COLLECTION = ('a'..'c')
> >   M_COLLECTION.each do |alpha|
> >     define_method(alpha) {
> >       block_given? ? puts(yield(alpha)) : puts(alpha)
>
> This block_given? sees the context where define_method is
> called, that is defining DefMethod and always false.
>
> >     }
> >   end
> > end
>
> In 1.9, you have to write as:
>
> >     define_method(alpha) {|&block|
> >       block ? puts(yield(alpha)) : puts(alpha)
> >     }
>
> No way in 1.8.
>
> --
> Nobu Nakada
>
>