gistfile1.rb

# Comments may or may not make sense.
class Array
  def bigger?( ary )
    # Check that self element is greater than comparison element
    # Uses 0 if either is nil
    if (self[0]||0) > (ary[0]||0)
      return true
    else
      # if either of them don't exist as elements, comparison is bigger
      # so return false
      return false unless self[0] && ary[0]
      # Otherwise carry on and compare the next level
      return self[1, self.size].bigger?(ary[1, ary.size])
    end
  end
end

# And now so we can compare the software strings
def bigger_than?( str1, str2 )
  str1.split(".").map {|x| x.to_i }.bigger?(str2.split(".").map {|x| x.to_i })
end

require 'test/unit'
class ArrayTest < Test::Unit::TestCase
  def test_with_the_same_version_number_count_should_find_versions_with_higher_major_numbers_biggest
    assert [3].bigger?( [2] )
  end
  def test_that_minor_versions_are_irrelevant_with_higher_major_numbers
    assert [2, 3].bigger?( [1, 4] )
    assert [2].bigger?( [1, 10] )
  end
  def test_that_longer_version_numbers_work
    assert [2, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1].bigger?( [1, 4, 1, 1, 1, 1, 1, 1] )
  end
end