From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-10-03T19:15:35+09:00
Subject: Re: Hash of arrays - strange behavior.

Jakub Ku添ma wrote:
> Hello,
>
> Could somebody explain me the following behavior?
>
> irb(main):001:0> h = Hash.new([])
> => {}
> irb(main):002:0> h[1].push(1)
> => [1]
> irb(main):003:0> h
> => {}

Hash.new(arg) makes arg the default, but it doesn't assign to the hash. You 
want h = Hash.new {|h,k| h[k] = []}


HTH,
Sebastian
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