From: Kero van Gelder <kero@...4050.upc-d.chello.nl>
Date: 2001-11-19T06:23:27+09:00
Subject: [ruby-talk:25790] Re: Array.new(n, Array.new(m)) weirdness, but "select isn't broken"

> The following occurs ...
> 
> irb(main):001:0> a = Array.new(3, Array.new(3))
> [[nil, nil, nil], [nil, nil, nil], [nil, nil, nil]]
> irb(main):002:0> a[1][1] = 0
> 0
> irb(main):003:0> a
> [[nil, 0, nil], [nil, 0, nil], [nil, 0, nil]]
> 
> .... however I would have expected (and hoped for) ...
> [[nil, nil, nil], [nil, 0, nil], [nil, nil, nil]]

You put one Array three times in the other array.
Compare:

  b = 7
  a = Array.new(3, b)

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