From: Christer Nilsson <janchrister.nilsson@...>
Date: 2005-12-13T21:09:31+09:00
Subject: Re: stable sort_by?

Or using Array instead of Hash:

I don't think sort is stable. You have to specify the sorting criteria,
and sort only once.

require 'test/unit'
class TestSortBy < Test::Unit::TestCase
  def test_all
    a= [["A", 3, 2, 6, 114],
        ["B", 0,-2, 4, 112],
        ["C", 3, 4, 4, 110],
        ["D", 3, 4, 4, 108]]

    assert_equal [["A", 3, 2, 6, 114],
                  ["C", 3, 4, 4, 110],
                  ["D", 3, 4, 4, 108],
                  ["B", 0, -2, 4, 112]],
                  a.sort_by {|name,x,y,z,w| [x, w] }.reverse
  end
end

Christer

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