From: Ben Giddings <bg-rubytalk@...>
Date: 2003-10-02T02:15:27+09:00
Subject: Re: Array and hash iteration questions

Robert Klemme wrote:
> cases = Hash.new {|h,k| h[k] = [0, 0]}

Ah.  I couldn't remember how to use the block form properly.  I'm actually 
going to use:

cases = Hash.new {|hash, key| hash[key] = Hash.new(0)}

Because it will make some of the later stuff more clear like

cases[case]['Number'] += 1
cases[case]['Errors'] += 1 if arr[OFFSET] =~ /Error/

> cases.sort.each do |ca, counter|
>   printf "%10s: %4d", ca, counter[0]
>   printf " %4d", counter[1] if counter[1] > 0
>   print "\n"
> end

Aha, I just assumed hash didn't have a sort method, because the concept of 
a "sorted hash" seemed meaningless, but since it actually returns an array 
containing [key, value] pairs, that's perfect!

Thanks Robert

Ben