From: Adam Gardner <adam.oddfellow@...>
Date: 2009-05-09T08:23:11+09:00
Subject: Re: NilClass and Comparable

RubyTalk@gmail.com wrote:
>>> nil==0
> => false
>>> class NilClass
>>> include Comparable
>>> def <=>(other)
>>>  0
>>> end
>>> end
> => nil
>>> [1,nil,2].sort
> ArgumentError: comparison of Fixnum with nil failed
>   from (irb):11:in `sort'
>   from (irb):11
>>> p nil > 2
> false
> => nil
>>> p nil > -1
> false
> => nil
>>> p nil == 0
> true
> => nil
> 
> 
> 
> What I am missing here?

Probably this:

irb(main):003:0> class NilClass
irb(main):004:1> def <=>(other)
irb(main):005:2> 0
irb(main):006:2> end
irb(main):007:1> end
=> nil
irb(main):008:0> nil <=> 1
=> 0
irb(main):009:0> 1 <=> nil
=> nil
irb(main):010:0>
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