From: "Ara.T.Howard" <ahoward@...>
Date: 2004-02-20T20:20:32+09:00
Subject: Re: proposal: let kind_of take more arguments

On Thu, 19 Feb 2004, Robert Klemme wrote:

> Date: Thu, 19 Feb 2004 15:43:05 +0100
> From: Robert Klemme <bob.news@gmx.net>
> Newsgroups: comp.lang.ruby
> Subject: Re: proposal: let kind_of take more arguments
> 
> 
> "Simon Strandgaard" <neoneye@adslhome.dk> schrieb im Newsbeitrag
> news:pan.2004.02.19.14.25.27.611885@adslhome.dk...
> > It just hit me.. why not let kind_of? take more arguments?
> >
> > irb(main):001:0> x = 3
> > => 3
> > irb(main):002:0> x.kind_of?(String)
> > => false
> > irb(main):003:0> x.kind_of?(String, Fixnum)
> > ArgumentError: wrong number of arguments(2 for 1)
> >         from (irb):3:in `kind_of?'
> >         from (irb):3
> > irb(main):004:0>
> >
> >
> >
> > For instance I have
> >
> > def push(choice)
> >   if choice.kind_of?(Zero) == false and choice.kind_of?(One) == false
> 
> Never compare boolean values to get boolean values.  This can lead to
> hideous bugs if the method at hand does not return "true" or "false" -
> especially with languages that have more than one value for either.


what do you reccomend (when a case won't do) ?

....
  unless choice.kind_of?(Zero) or choice.kind_of?(One)
....

-a
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