euclidean_distance.rb

def euclidean_distance(p1,p2)
  sum_of_squares = 0
  p1.each_with_index do |p1_coord,index| 
    sum_of_squares += (p1_coord - p2[index]) ** 2 
  end
  Math.sqrt( sum_of_squares )
end

require 'test/unit'
class EuclideanDistanceTest < Test::Unit::TestCase
  def test_distance_between_2_points_with_2_dimensions
    assert_in_delta 2.828, euclidean_distance([1,2], [3,4]),0.001
  end
  
  def test_distance_between_2_points_with_3_dimensions
    assert_in_delta 5.196, euclidean_distance([1,2,3], [4,5,6]),0.001
  end
end