From: gabriele renzi <surrender_it@...1.vip.ukl.yahoo.com>
Date: 2003-11-18T22:32:22+09:00
Subject: Re: testing argument type and duck typing, newbie question

il Tue, 18 Nov 2003 13:34:32 +0100, Raphael Bauduin
<raphael.bauduin@be.easynet.net> ha scritto::

>Hi,
>
>I have a method taking one argument that can be an integer or a string.
>How do I test the argument to know if it's a string or an integer? All 
>the duck typing things I've read make me wonder what's the best way 
>to determine if the argument is an integer or a string.....

you don't want duck typing :)

>> def f(a,b)
>>  raise 'wrong parameters!' unless a.is_a?String and b.is_a?Numeric
>> end
=> nil
>> f(1,2)
RuntimeError: wrong parameters!
        from (irb):2:in `f'
        from (irb):4
>> f('yes',2)
=> nil
>>

or if you wont you can get StrongTyping and do:

def f(a,b)
 expect(String,a,Integer,b)
end