From: Robert Klemme <bob.news@...>
Date: 2004-08-24T16:35:43+09:00
Subject: Re: *with* block?


"Jamis Buck" <jgb3@email.byu.edu> schrieb im Newsbeitrag
news:412A9A3D.2050808@email.byu.edu...
> Zach Dennis wrote:
> > I am looking for a structure like:
> >
> > my_obj = boxWidget.new
> > with my_obj do
> >    x = 0
> >    y = 10
> >    width = 100
> >    height = 100
> > end
> >
> > instead of having to say
> >
> > my_obj = boxWidget.new
> > my_obj.x = 0
> > my_obj.y = 10
> > my_obj.width = 100
> > my_obj.height = 100
> >
> >
> >
> > Can you do this already? If not....anyone support an RCR for it besides
me?
>
> No such beast "out of the box," but there have been various discussions
> on the list about this feature. I believe one implementation presented
was:
>
>    class Object
>      def with(obj, &block)
>        obj.instance_eval &block
>      end
>    end
>
>    with "hello" do
>      puts length
>      puts reverse
>    end

Doesn't work for member init since all statements of the form "x=y" create
local variables in the block.  I'd prefer something like:

class Object
  def member_init(map)
    map.each do |name, val|
      send "#{name}=", val
    end
    self
  end
end

ost = OpenStruct.new.member_init(
  :name => "foo",
  :age => 10
)

Kind regards

    robert