On Jun 8, 2011, at 16:12 , Iñáki Baz Castillo wrote:

> 2011/6/9 Anurag Priyam <anurag08priyam / gmail.com>:
>>> I cannot find which class or module #hash method belongs to. I
>>> expected it could be in Object class, but it's not. Where is it?
>> 
>> method(:hash).owner # => Kernel
> 
> Thanks, I didn't know the #owner method :)
> 
> 
>> I think the above tip was discussed on the list sometime back.
> 
> It's strange that the #hash method is not defined within the Kernel doc:
> 
>  http://www.ruby-doc.org/core/classes/Kernel.html

% ri hash
...
(from ruby core)
=== Implementation from Object
------------------------------------------------------------------------------
  obj.hash    => fixnum

------------------------------------------------------------------------------

Generates a Fixnum hash value for this object. This function must have the
property that a.eql?(b) implies a.hash == b.hash. The hash value is used by
class Hash. Any hash value that exceeds the capacity of a Fixnum will be
truncated before being used.
...