From: Yochen Gutmann <yoche2001@...>
Date: 2006-08-07T00:52:40+09:00
Subject: Re: How to react on nil or wrong object-type as parameter

> 
>    def foo(obj)
>      unless obj.respond_to? :to_str
>        raise ArgumentError, "argument must be a string"
>      end
> 
>      str = obj.to_str
> 
>      ...
>    end
I see, but if it is a long method I might end up with

unless obj.respond_to? :to_str,:another_method, :yet_another_method, 
:and_again_another_method

and so on. This seems to be one of the only ways to make it secure. 
Another way would be to wrap a begin/rescue around the whole method-body 
to capture all possibly arrising ArgumentErrors. Am I right with this?

Ahoi,
Yochen

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