From: Heesob Park <phasis@...>
Date: 2009-04-30T17:01:19+09:00
Subject: Re: Defining a default proc for Hash

2009/4/30 Srijayanth Sridhar <srijayanth@gmail.com>:
> Yes, I did. All that tells me is that it isn't possible to set a default
> proc using default or any other calls. Which is why I asked, if there is any
> *other* way to do it. If not, it simply can't be done. Of course, it would
> also be nice if someone could explain the rationale for not wanting to alter
> the default proc once it has been defined.
>
You can do it like this:

class Hash
	def default_proc=(blk)
             self.replace(Hash.new(&blk).merge(self))
	end
end

h = {1=>2,3=>4}
p h.default_proc
h.default_proc = proc {|h,k| h[k]=3 }
p h.default_proc

Regards,

Park Heesob