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List:       ruby-talk
Subject:    Re: hash of hashes
From:       Emmanuel Touzery <emmanuel.touzery () wanadoo ! fr>
Date:       2003-10-03 11:07:24
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Paul Argentoff wrote:

>On Friday 03 October 2003 14:48, Emmanuel Touzery wrote:
>
>  
>
>>irb(main):001:0> a = {}
>>{}
>>irb(main):002:0> a["blue"] = {}
>>{}
>>irb(main):003:0> a["blue"]["red"] = 3
>>3
>>irb(main):004:0> a["blue"]
>>{"red"=>3}
>>irb(main):005:0> a["blue"]["red"]
>>3
>>irb(main):006:0>
>>    
>>
>
>I need something like this:
>
>a = {{}} # this doesn't work, but i've just written it here to emph. the
>         # subject
>...
># somewhere in the iteration
>a[foo][bar] = baz
>...
>  
>
i think you need ruby 1.8's block form for creating hashes. i asked that 
question recently, and here is the snippet from Guy Decoux:

svg%  ruby -e 'has = Hash.new {|h,k| h[k]={}}; has["blue"]["red"] = 1; p has'
{"blue"=>{"red"=>1}}
svg% 




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