From: Brian Candler <b.candler@...>
Date: 2009-02-09T22:24:51+09:00
Subject: Re: Module#=== vs Object#is_a?

Peter Fitzgibbons wrote:
> HI All,
> 
> Could somone explain the subtle difference between Module#=== and
> Object#is_a?
> 
> I found a usage of === to test if an argument is Regexp or not... just 
> want
> to know the restrictions.
> The code is beautiful...
> 
> if Regexp === regexp_or_string

  case regexp_or_string
  when Regexp
    .. do something
  when String
    .. do something else
  else
    raise "Not a regexp or string"
  end

This is the same thing though: case x when y .. does a "y === x" test 
under the hood.
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