youngnh · September 10, 2010 14:53 · Sep 10, 2010 · Sep 10, 2010 · Sep 10, 2010 · Sep 10, 2010
diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -29,17 +29,22 @@
 #
 # Your goal is to write the score method.
 
-def grouping(xs)
-  unless xs.empty?
+def grouping(xs, &block)
+  unless xs.empty?    
     ys = xs.take_while {|x| x == xs.first}
-    [ys] + grouping(xs.drop(ys.count))
+    rest = xs.drop(ys.count)
+
+    ys = yield ys if block_given?
+    block = lambda {|x| x} unless block_given?
+
+    [ys] + grouping(rest, &block)
   else
     xs
   end
 end
 
 def score(dice)
-  scores = grouping(dice.sort).collect do |rolled|
+  scores = grouping(dice.sort) do |rolled|
     score_roll rolled.first, rolled.count
   end
 

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -39,13 +39,23 @@ def grouping(xs)
 end
 
 def score(dice)
-  scores = dice.sort.collect do |die| 
-    {1 => 100, 5 => 50}.fetch die, 0
+  scores = grouping(dice.sort).collect do |rolled|
+    score_roll rolled.first, rolled.count
   end
 
   scores.reduce 0, :+
 end
 
+def score_roll(die, count)
+  if count >= 3
+    points = die == 1 ? 1000 : (die * 100)
+    points + score_roll(die, count - 3)
+  else
+    points = {1 => 100, 5 => 50}.fetch(die, 0)
+    points * count
+  end
+end
+
 class AboutScoringAssignment < EdgeCase::Koan
   def test_score_of_an_empty_list_is_zero
     assert_equal 0, score([])
@@ -71,6 +81,10 @@ def test_grouping_empty_array_returns_empty_array
     assert_equal [], grouping([])
   end
 
+  def test_grouping_single_element_array_returns_nested_array
+    assert_equal [[5]], grouping([5])
+  end
+
   def test_grouping_of_array_returns_subarrays
     assert_equal [[1,1], [5,5]], grouping([1,1,5,5])
   end

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -29,8 +29,17 @@
 #
 # Your goal is to write the score method.
 
+def grouping(xs)
+  unless xs.empty?
+    ys = xs.take_while {|x| x == xs.first}
+    [ys] + grouping(xs.drop(ys.count))
+  else
+    xs
+  end
+end
+
 def score(dice)
-  scores = dice.collect do |die| 
+  scores = dice.sort.collect do |die| 
     {1 => 100, 5 => 50}.fetch die, 0
   end
 
@@ -58,6 +67,14 @@ def test_score_of_single_2s_3s_4s_and_6s_are_zero
     assert_equal 0, score([2,3,4,6])
   end
 
+  def test_grouping_empty_array_returns_empty_array
+    assert_equal [], grouping([])
+  end
+
+  def test_grouping_of_array_returns_subarrays
+    assert_equal [[1,1], [5,5]], grouping([1,1,5,5])
+  end
+
   def test_score_of_a_triple_1_is_1000
     assert_equal 1000, score([1,1,1])
   end

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -31,7 +31,7 @@
 
 def score(dice)
   scores = dice.collect do |die| 
-    die == 1 ? 100 : (die == 5 ? 50 : 0)
+    {1 => 100, 5 => 50}.fetch die, 0
   end
 
   scores.reduce 0, :+

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -31,7 +31,7 @@
 
 def score(dice)
   scores = dice.collect do |die| 
-    die == 1 ? 100 : 50
+    die == 1 ? 100 : (die == 5 ? 50 : 0)
   end
 
   scores.reduce 0, :+

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -30,7 +30,11 @@
 # Your goal is to write the score method.
 
 def score(dice)
-  dice.size == 0 ? 0 : 50
+  scores = dice.collect do |die| 
+    die == 1 ? 100 : 50
+  end
+
+  scores.reduce 0, :+
 end
 
 class AboutScoringAssignment < EdgeCase::Koan

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -30,7 +30,7 @@
 # Your goal is to write the score method.
 
 def score(dice)
-  0
+  dice.size == 0 ? 0 : 50
 end
 
 class AboutScoringAssignment < EdgeCase::Koan

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -30,7 +30,7 @@
 # Your goal is to write the score method.
 
 def score(dice)
-  # You need to write this method
+  0
 end
 
 class AboutScoringAssignment < EdgeCase::Koan

diff --git a/about_scoring_project.rb b/about_scoring_project.rb
@@ -0,0 +1,74 @@
+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 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
+end
+
+class AboutScoringAssignment < 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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