From: Gregory Brown <gregory.t.brown@...>
Date: 2007-08-03T12:21:23+09:00
Subject: Re: Dynamic method call

On 8/2/07, Pe�a, Botp <botp@delmonte-phil.com> wrote:
> From: Gregory Brown [mailto:gregory.t.brown@gmail.com]
> # do_something(..) if condition
> #
> # doesn't require anything.  I'm still missing what value this
> # if_is_true stuff is adding.
>
> i think he's asking for boolean obj so he can chain conditions. soemthing like,
>
>    cond.if_true(foo).bar.blah.if_true.baz.light
>
> which is
>
>    if cond
>       if x = foo.bar.blah
>          x.baz.light
>       end
>    end

Sure, that could be helpful, but I'm not sure how you came up with
that based on what was asked.

For what you've shown there, I've often longed for a Null object

something like

class Null < BasicObject
  def self.method_missing(id,*args,&block)
     self
  end
end

module Kernel
  def if_true(condition)
     condition ? self : Null
  end
end

Note that I didn't even remotely test the above (though I have
implemented this before for fun), but that hopefully the idea is
preserved.