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Thanks, David.  I think I understand it now.





________________________________
From: David A. Black <dblack / rubypal.com>
To: ruby-talk ML <ruby-talk / ruby-lang.org>
Sent: Saturday, January 10, 2009 9:53:49 AM
Subject: Re: Default values of hashes

Hi --

On Wed, 7 Jan 2009, Glenn wrote:

> Thanks for the tips.  I learned a lot from all of the suggestions.
>
> Not sure, though, if I understand this line:
>
> hash[1][2][3]  ash.new(0)
>
> Is that a valid line on its own.  If so, it does not seem to work for me.  I get the following error:
>
> undefined method `[]for 0

Here's how to use it:

>> hproc  ambda {|h,k| h[k]  ash.new(&hproc) }
#<Proc:0x00248420@(irb):14>
>> hash  ash.new(&hproc)
{}
>> hash[1][2][3]  ash.new(0)
{}
>> hash[1][2][3]["x"] + 0
10
>> hash[1][2][3]
{"x"
0}


David

-- 
David A. Black / Ruby Power and Light, LLC
Ruby/Rails consulting & training: http://www.rubypal.com
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