From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-11-28T00:57:41+09:00
Subject: Re: Performance issues with large files -- ruby vs. python :

brabuhr@gmail.com wrote:
> unless main_hash[date]
>   main_hash[date] = {}
>   main_hash[date][company] = {}
>   main_hash[date][company][prod] = row_values
> else
>   unless main_hash[date][company]
>     main_hash[date][company] = {}
>     main_hash[date][company][prod] = row_values
>   else
>     unless main_hash[date][company][prod]
>       main_hash[date][company][prod] = row_values
>     end
>   end
> end

DO NOT use unless...else. It's the most confusing conditional construct 
ever. Use if and flop the bodies, or just use if !condition.

- Charlie