From: Robert Klemme <bob.news@...>
Date: 2005-10-25T23:57:02+09:00
Subject: Re: Comparing Classes with Case ?

Warren Seltzer wrote:
> The following failure surprised me:
> 
> Version 1:
> 
> irb(main):068:0> "hi".class == "hi".class
> => true
> irb(main):069:0> "hi".class === "hi".class
> => false
> 
> 
> Version 2:
> 
> irb(main):055:0> case "whatever".class
> irb(main):056:1> when String
> irb(main):057:1>   p "it is a string"
> irb(main):058:1> else
> irb(main):059:1*  p "it is not a string"
> irb(main):060:1> end
> "it is not a string"
> 
> What it amounts to is you can't use case/when to test for class. 
> This is a HUGE LOSE. The pickaxe book .chm says YOU CAN do it.  I'm
> using ruby 1.8.2 

You're using it wrong:

>> case "whatever"
>> when String; p "is string"
>> else p "no string"
>> end
"is string"
=> nil

Kind regards

    robert