From: 7stud -- <dolgun@...>
Date: 2007-10-11T12:25:25+09:00
Subject: Re: what does print call internally?

7stud -- wrote:
> 
> class Dog
>   def to_s
>     print "dog"
>   end
> end
> 
> d = Dog.new
> 
> print d
> puts
> 
> puts d
> 
> --output:--
> dog#<Dog:0x25634>
> dog#<Dog:0x25634>
>

I guess that should be:

class Dog
  def to_s
    "dog"
  end
end

d = Dog.new

print d
puts

puts d

--output:--
dog
dog


I don't understand the output of my first example: print returns nil, so 
print 'dog' should return nil, which means to_s returns nil, and so 
print d should be equivalent to print nil.
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