From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-11-04T05:48:11+09:00
Subject: Re: x=[:some_key] does not work?

Lionel Bouton wrote:
> For a 2-dimensional Hash you can use:
>
> h = Hash.new({})

That won't result in the behaviour most people would expect from a 
2-dimensional hash:
>> h = Hash.new({})
=> {}
>> h[:a][:foo] = "bar"
=> "bar"
>> h[:a]
=> {:foo=>"bar"}
>> h
=> {}
>> h[:b][:chunky] = "bacon"
=> "bacon"
>> h[:b]
=> {:chunky=>"bacon", :foo=>"bar"}
>> h[:c]
=> {:chunky=>"bacon", :foo=>"bar"}
>> h
=> {}

You want to a) use the block-form of Hash.new to not use the same instance of 
a hash everytime and b) assign the new Hash instead of just returning it.


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