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- require File.expand_path(File.dirname(__FILE__) + '/edgecase')
- # 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)
- score = 0
- return score if dice.empty?
- counts = [0,0,0,0,0,0]
- dice.each {|d| counts[d-1] += 1 }
- ones, twos, threes, fours, fives, sixes = counts
- if ones >= 3 then
- score += 1000 + ((ones-3) * 100)
- else
- score += (ones * 100)
- end
- if fives >= 3 then
- score += 500 + ((fives-3) * 50)
- else
- score += fives * 50
- end
- score += 200 if twos >= 3
- score += 300 if threes >= 3
- score += 400 if fours >= 3
- score += 600 if sixes >= 3
- score
- end
- class AboutScoringProject < EdgeCase::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])
- end
- end
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