From: James Edward Gray II <james@...>
Date: 2006-04-01T23:29:43+09:00
Subject: Re: Ruby way to sum digits

On Apr 1, 2006, at 7:22 AM, Marcus Lunzenauer wrote:

> Hello!
>
> To sum the digits of an Integer I have got
>
> class Integer
>   def sum_digits()
>     sum = 0
>     n = self
>     begin sum += n % 10; n /= 10 end while n > 0
>     sum
>   end
> end
>
>
> Is there a more Ruby Way to do this? The above method smells of  
> Java, doesn't it?

Here is what I thought of when reading this:

 >> class Integer
 >>   def sum_digits
 >>     to_s.split("").inject(0) { |sum, n| sum + n.to_i }
 >>   end
 >> end
=> nil
 >> 1234.sum_digits
=> 10

Hope that helps.

James Edward Gray II