From: Jimmy Kofler <koflerjim@...>
Date: 2008-05-08T05:44:17+09:00
Subject: Re: hash adding values

> Tim Wolak wrote:
> 
> I worked with your code and its giving me the same thing I had before, 
> below is the output of the script.  What I need to do is for example is 
> the account number 740 is to store it as key 740 and the value is the 
> sum of the balances listed.  So where there is the account number listed 
> more than once it uses that account number and balance and moves on to 
> the next line and if that account number is not in the has it puts a new 
> account number with its balance.  Hope this help make a little more 
> sense of what I'm trying to do.
> 
> {"700"=>[2876.86]}
> {"701"=>[654.18]}
> ...

Could you use Hash#collate (together with an Array#sum method) for this?

http://snippets.dzone.com/posts/show/4930

Cheers,

j.k.

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