From: Srijayanth Sridhar <srijayanth@...>
Date: 2009-04-30T16:34:44+09:00
Subject: Re: Defining a default proc for Hash

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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.

Thank you,

Jayanth



On Thu, Apr 30, 2009 at 12:58 PM, 7stud -- <bbxx789_05ss@yahoo.com> wrote:

> Srijayanth Sridhar wrote:
> > Hello,
> >
> > Is there a way to redefine or newly define a default proc for Hash way
> > after
> > it has been constructed and populated with elements?
> >
> > There seems to be a #default= but no #default_proc=
> >
>
> Did you read this?
>
> ---------------------------------------------------------- Hash#default=
>     hsh.default = obj     => hsh
> ------------------------------------------------------------------------
>      ....
>
>      It is not possible to set the a default to a
>     +Proc+ that will be executed on each key lookup.
>
>       ...
>
>        # This doesn't do what you might hope...
>        h.default = proc do |hash, key|
>          hash[key] = key + key
>        end
>        h[2]       #=> #<Proc:0x401b3948@-:6>
>        h["cat"]   #=> #<Proc:0x401b3948@-:6>
>
>
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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