From: Pat Maddox <pergesu@...>
Date: 2006-05-09T04:26:22+09:00
Subject: Re: How can I write the awesome kind of code?

On 5/8/06, James Edward Gray II <james@grayproductions.net> wrote:
> On May 8, 2006, at 1:59 PM, Pat Maddox wrote:
>
> > On 5/8/06, James Edward Gray II <james@grayproductions.net> wrote:
> >> On May 8, 2006, at 1:38 PM, Pat Maddox wrote:
> >>
> >> > I'm writing a small app to do poker simulations.  I read a lot of
> >> > blogs in which the author shows off his cool DSL.  I decided I
> >> want to
> >> > be able to specify a poker hand in my app like
> >> >
> >> > hand "my_hand" do
> >> >  players 10
> >> >  chips     1000
> >> > end
> >> >
> >> > my_hand.foo
> >> >
> >> > How can I do something like that?
> >>
> >> class Hand
> >>    ...
> >> end
> >>
> >> def hand( ..., &init )
> >>    Hand.new( ... ).instance_eval(&init)
> >> end
> >>
> >> I really think you'll be happy in the long run though if you drop the
> >> instance_eval() and pass the hand into the block instead.
> >>
> >> James Edward Gray II
> >>
> >>
> >
> > Okay so now I have
> >
> > class Hand
> >  def players(p = nil)
> >    @players = p unless p.nil?
> >    @players
> >  end
> >
> >  def chips(c = nil)
> >    @chips = c unless c.nil?
> >    @chips
> >  end
> > end
> >
> > def hand(&init)
> >  yield(Hand.new) if block_given?
> > end
> >
> > hand do |h|
> >  h.players 10
> >  h.chips   1000
> > end
> >
> > Does that look right?
>
> You can remove the &init parameter to hand(), since you are using
> yield.  You may also want to make players() and chips() more Rubyish
> with players=() and chips=().
>
> To keep the hand object you could have hand return it, or perhaps add
> it to some global Hash by name.
>
> Hope that helps.
>
> James Edward Gray II
>
>
>

I took out &init, I understand why I don't need that in there.

However after doing all this, I'm not sure I get any benefit,
particularly if I stick to the more Rubyish players= and chips=

hand "my_hand" do |h|
  h.chips = 1000
  h.players = 10
end

vs

my_hand = Hand.new
my_hand.chips = 1000
my_hand.players = 10

It's basically the same...

Pat