From: Hiroyuki Adachi <hiroyuki-a@...>
Date: 2005-07-01T16:05:22+09:00
Subject: [ruby-list:40892] Re: 配列をシャッフル

array = [1, 2, 3, 4, 5]
array.each_index do |idx|
  jdx = rand(idx + 1)
  array[idx], array[jdx] = array[jdx], array[idx]
end
p array #=> [1, 4, 5, 2, 3]

大差ないですね。
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安達 広幸