From: Morton Goldberg <m_goldberg@...>
Date: 2006-12-21T16:30:53+09:00
Subject: Re: Is there a Ruby library version problem with my ISP ?

On Dec 20, 2006, at 5:30 PM, Josselin wrote:

> I am running locally without any problem the following simple  
> statement (detect first non-zero value...)
>
> nb_cities_alphabet =  [7, 21, 20, 1, 4, 1, 18, 3, 5, 1, 4, 48, 21,  
> 8, 0, 31, 6, 10, 47, 7, 0, 1, 0, 0, 0, 0]
>
>      i =  nb_cities_alphabet.index(nb_cities_alphabet.detect {|x| x  
> > 0})
>      letter = ('A'..'Z').to_a[i]
>
> but when running it with my ISP I get the error message :
>
> NoMethodError :  undefined method `detect' for false:FalseClass
>
> any idea why this error ? and why I don't get it locally ?
>
> if it's actually a lib problem...  any trick to replace it
> thanks a lot

I don't have any idea about what's going wrong with your server, but  
you might try the following code. It's a little more robust and  
efficient than what you are using now.

<code>
nb_cities_alphabet =  [7, 21, 20, 1, 4, 1, 18, 3, 5, 1, 4, 48, 21, 8,  
0, 31, 6, 10, 47, 7, 0, 1, 0, 0, 0, 0]

i = ?* - ?A
nb_cities_alphabet.each_with_index do |e, k|
    if e > 0
       i = k
       break
    end
end
letter = (i + ?A).chr
</code>

It will assign an asterisk ('*') to letter when there are no non-zero  
items in nb_cities_alphabet, which help with debugging.

Regards, Morton