From: "J. mp" <joaomiguel.pereira@...>
Date: 2007-02-26T08:17:19+09:00
Subject: Re: Type of class

Stefano Crocco wrote:
> Alle domenica 25 febbraio 2007, J. mp ha scritto:
>> 101:       errors = @errors[attribute.to_s]
>> 102:       return nil if errors.nil?
>> 103:       errors.size == 1 ? errors.first : errors
>> 104:     end
>>
>>
>> How do I know that call on method on returned and array or an string?
>>
>> Thanks
> 
> The is_a? method tells whether the receiver is an instance of the class 
> passed
> as argument or of one of its derived class:
> 
> a=[1,2,3]
> 
> a.is_a?(Array)
> => true
> a.is_a?(String)
> => false
> 
> If you need to know whether an object is an instance of exactly a 
> specific
> class (not of derived class), you can use the == on the class:
> 
> class A
> end
> 
> class B < A
> end
> 
> b=B.new
> b.is_a?(A)
> => true
> b.class==A
> => false
> b.class==B
> => true
> 
> I hope this helps
> 
> Stefano
Thanks Stefano,
Meanwhile I found (before seeing your response) another way, don't know 
which one is the best, but also works

a.instance_of? Array

Maybe they are the same methods but one is alias of the other? Or 
there's any really difference between them?

Thanks again.

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