From: Brian Candler <B.Candler@...>
Date: 2003-02-13T08:28:58+09:00
Subject: Re: hm,... arr[1]["name"]

On Thu, Feb 13, 2003 at 06:02:50AM +0900, Chris Pine wrote:
> Another way:
> 
>   #  Create an empty hash in each slot of the array.
>   arr = Array.new (10) { {} }
>     #  same as:
>     #  arr = Array.new (10) do
>     #    Hash.new
>     #  end

That doesn't work under ruby-1.6.8:

  arr = Array.new(10) { {} }
  => [nil, nil, nil, nil, nil, nil, nil, nil, nil, nil]

Some care is required. You can't do:

  arr = Array.new(10, {} )
  => [{}, {}, {}, {}, {}, {}, {}, {}, {}, {}]

because then you have got ten references to the same hash:

  arr.collect{|i| i.id}.join(',')
  => "67787102,67787102,67787102,67787102,67787102,67787102,67787102,67787102,67787102,67787102"
f
You need something like:

  arr = []
  10.times { arr << {} }

Regards,

Brian.