From: Peter Szinek <peter@...>
Date: 2007-04-14T03:55:39+09:00
Subject: Re: Combining Hash elements to produce single line output

Paul wrote:
> Hi there.  I know I've done something similar to this before but I
> seem to be stumped at the moment and thought I would ask for help.
> 
> I have a temporary Hash array that holds information in different
> elements that need to be combined to produce single line outputs.
> Here's some detail:
> 
> tmp_hash =
> [["foo:1", "123"],
>  ["foo:2", "abc"],
>  ["bar:1", "456"],
>  ["bar:2", "xyz"]]
> 
Whew, this will be ugly... I am sure somebody has a more effective
solution, but until then:

to_hash = tmp_hash.inject(Hash.new('')) {|hash, arr|
   key = arr[0].scan(/(.+):/)[0][0]
   hash[key] = hash[key]+(val = hash[key] == '' ? '' : ',')+arr[1]
   hash }



Cheers,
Peter
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