From: Mike Gold <mike.gold.4433@...>
Date: 2008-11-01T18:04:06+09:00
Subject: Re: n-dimensional array in Ruby

Mike Gold wrote:
> def Array.multi(*dimensions)
>   dimensions.reverse.inject(nil) { |result, dim|
>     Array.new(dim) { result ? result.dup : nil }
>   }
> end

My mistake.  Array#dup is not a recursive deep copy.

def Array.multi(*dimensions)
  dimensions.reverse.inject(nil) { |result, dim|
    Array.new(dim) { Marshal.load(Marshal.dump(result)) }
  }
end
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