about_scoring_project.rb

require File.expand_path(File.dirname(__FILE__) + '/neo')

# Greed is a dice game where you roll up to five dice to accumulate
# points.  The following "score" function will be used to calculate the
# score of a single roll of the dice.
#
# A greed roll is scored as follows:
#
# * A set of three ones is 1000 points
#
# * A set of three numbers (other than ones) is worth 100 times the
#   number. (e.g. three fives is 500 points).
#
# * A one (that is not part of a set of three) is worth 100 points.
#
# * A five (that is not part of a set of three) is worth 50 points.
#
# * Everything else is worth 0 points.
#
#
# Examples:
#
# score([1,1,1,5,1]) => 1150 points
# score([2,3,4,6,2]) => 0 points
# score([3,4,5,3,3]) => 350 points
# score([1,5,1,2,4]) => 250 points
#
# More scoring examples are given in the tests below:
#
# Your goal is to write the score method.

def score(dice)
  # You need to write this method
  return 0 if dice.length == 0
  return 100 if (dice.length == 1 and dice[0] == 1)
  return 50 if (dice.length == 1 and dice[0] == 5)

  score_map = {1 => 100, 5 => 50, 2 => 0, 3 => 0, 4 => 0, 6 => 0}

  score = 0
  # handle_triplets
  # remove triplets from the array
  (1..6).each do |die_face|
    if dice.count(die_face) >= 3
      if die_face == 1
        score += 1000
      else
        score += (die_face * 100)
      end
      counter = 0
      dice = dice.reject do |die_roll|
        counter += 1
        (die_roll == die_face) && counter < 4
      end
    end
  end

  # score the remaining individuals using the score map
  dice.each do |die_roll|
    score += score_map[die_roll]
  end

  score

  # score = 0
  # roll_counts = dice.inject({}) do |roll_counts, die_roll|
  #   roll_counts[die_roll] = 0 if roll_counts[die_roll] == nil
  #   roll_counts[die_roll] += 1
  #   roll_counts
  # end
  # roll_counts
end

class AboutScoringProject < Neo::Koan
  def test_score_of_an_empty_list_is_zero
    assert_equal 0, score([])
  end

  def test_score_of_a_single_roll_of_5_is_50
    assert_equal 50, score([5])
  end

  def test_score_of_a_single_roll_of_1_is_100
    assert_equal 100, score([1])
  end

  def test_score_of_multiple_1s_and_5s_is_the_sum_of_individual_scores
    assert_equal 300, score([1,5,5,1])
  end

  def test_score_of_single_2s_3s_4s_and_6s_are_zero
    assert_equal 0, score([2,3,4,6])
  end

  def test_score_of_a_triple_1_is_1000
    assert_equal 1000, score([1,1,1])
  end

  def test_score_of_other_triples_is_100x
    assert_equal 200, score([2,2,2])
    assert_equal 300, score([3,3,3])
    assert_equal 400, score([4,4,4])
    assert_equal 500, score([5,5,5])
    assert_equal 600, score([6,6,6])
  end

  def test_score_of_mixed_is_sum
    assert_equal 250, score([2,5,2,2,3])
    assert_equal 550, score([5,5,5,5])
    assert_equal 1100, score([1,1,1,1])
    assert_equal 1200, score([1,1,1,1,1])
    assert_equal 1150, score([1,1,1,5,1])
  end

end