From: Colin Bartlett <colinb2r@...>
Date: 2010-08-21T07:29:37+09:00
Subject: Re: case and class

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On Fri, Aug 20, 2010 at 10:51 PM, Ralph Shnelvar <ralphs@dos32.com> wrote:

> Why does "YYY" get printed out here?
>
> - - -
>
> class XXX
> end
>
> x = XXX.new
>
> case x.class
> when XXX
>  puts "XXX"
> else
>  puts "YYY"   # surprise!
> end

It's because of the definition of "===" which is used in the case statement.
Does the following help?

class XXX
end

x = XXX.new

case x.class
when XXX then puts "XXX"
else puts "YYY" # surprise!
end #=> YYY

case x
when XXX then puts "XXX 2"
else puts "YYY 2"
end #=> XXX 2

case x.class
when Class then puts "XXX 3"
else puts "YYY 3"
end #=> XXX 3

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