From: Gareth Adams <gareth.adams@...>
Date: 2006-08-09T21:05:08+09:00
Subject: Re: For Float#class why is '===' different from '=='

richB <richard_a_brunner <at> yahoo.com> writes:

> Why does '==' match, and '===' does not. I am trying to use a case
> statement on the class and it doesn't work because '===' is not giving
> the newbie expected result.

As others have said, === is a function call

case a
when Float # Float === a
when 2005 # 2005 === a

2005 is a FixNum, and FixNum implements === the same as ==
Float is a Class (as you'll see if you type Float.class), and Class implements
=== basically like this as far as I can tell:

class Class
  def ===(other)
    other.kind_of? self
  end
end

So, the reason you're getting the result you're getting is because a === b
doesn't necessarily mean b === a - it depends on the classes of a and b

Gareth