From: Stefan Rusterholz <apeiros@...>
Date: 2007-08-14T09:38:18+09:00
Subject: Re: to_str behavior

Nasir Khan wrote:
> Hi,
> I have two related questions on to_str behavior. AFAIK to_str does 
> automatic
> coercion to string wherever one is required, it is to be provided for
> objects that exhibit string like behavior. But this mental model did not
> match up with my test -

class StringLike
  include Comparable
  def initialize(val)
    @val = val
  end
  def <=>(other)
    @val <=> other.to_str
  end
  def to_str
    @val
  end
end

x = StringLike.new("hi")
x == "hi" # => true
"hi" == x # => true

That's from one of my older experiments. I don't remember the reasons. 
Feel free to examine why it works with <=> + Comparable.
HTH.

Regards
Stefan
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