From: Andrea Fazzi <andrea.fazzi@...>
Date: 2008-05-09T18:09:29+09:00
Subject: Re: How to re-replace Hash default value behaviour?

Siep Korteling wrote:
> Hash.new(0) and the block form of Hash.new{_smart_stuff_}  come in
> really handy while reading in a hash.
> When the reading is done however, my hash serves to provide data. At
> that stage, the default_value behaviour gets in the way. For instance,
> if the hash contains the number of goals for soccerplayers, I don't want
> the hash to return value "0" for the key "Wolfgang Amadeus Mozart"; by
> then I want plain old Nil, or "No data available".
> 
> failed experiment:
> 
> Class Hash
>   def default_proc
>     Nil
>   end 
> end
> 
> How can Hash.new behaviour be changed?
> 
> regards,
> Siep

a = Hash.new(0)

# do something with a

a = Hash.new { |h,k| h[k] = "No data available" }.merge(a)

But I don't know if this is what you want.

Bye.
Andrea
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