From: Gavin Kistner <gavin@...>
Date: 2004-02-20T20:22:23+09:00
Subject: Re: Can't case on class?

Kent S. wrote:
> Gavin Kistner wrote:
>>  3     puts "Class is #{@optionSet.class}."
>>  4     puts "Is it OK? #{@optionSet.class==ValidForm::OptionSet}"
>>  5     puts "What about this: #{@optionSet==ValidForm::OptionSet}"
>>  6     case @optionSet.class

>      mod === obj    => true or false

Bah, I forgot that case used === and not ==. Thanks, Kent.
So the questions I have now are:

a) Why does someClass===someClass return false?

b) Why does the     case fooInstance; when FooClass;   work?

I ask the second because:

irb(main):001:0> foo = %w{ a b c d }
=> ["a", "b", "c", "d"]
irb(main):002:0> foo.class
=> Array
irb(main):003:0> foo.class==Array
=> true
irb(main):004:0> foo.class===Array
=> false
irb(main):005:0> foo==Array
=> false
irb(main):006:0> foo===Array
=> false


Line 4 confirms what Kent pointed out...but line 6 seems to indicate 
that the case statement switching off of the instance itself (which does 
work) should not work.


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