[2023][ruby][7.x] refactoring

2023/ruby/day_07.rb

@@ -8,24 +8,27 @@ HAND_STRENGTH = [
   [1, 1, 1, 1, 1], # high card
 ].reverse.each.with_index.to_h { [_1, _2] }
 
-module PartOne
-  CARD_STRENGTH = ((?2..?9).to_a + %w[ T J Q K A ]).each.with_index.to_h
+class PartOne
+  CARD_RANK = ((?2..?9).to_a + %w[ T J Q K A ]).each.with_index.to_h
 
-  def self.strength(cards)
+  def strength(cards)
     tally = cards.tally
     strengths = [
-      HAND_STRENGTH.fetch(tally.values.sort),
-      *cards.map { CARD_STRENGTH.fetch(_1) },
+      self.hand_type(tally),
+      *cards.map { CARD_RANK.fetch(_1) },
     ]
     strengths.map { (?a.ord + _1).chr }.join
   end
+
+  def hand_type(tally)
+    HAND_STRENGTH.fetch(tally.values.sort)
+  end
 end
 
-module PartTwo
-  CARD_STRENGTH = ([?J] + (?2..?9).to_a + %w[ T Q K A ]).each.with_index.to_h
+class PartTwo < PartOne
+  CARD_RANK = ([?J] + (?2..?9).to_a + %w[ T Q K A ]).each.with_index.to_h
 
-  def self.strength(cards)
-    tally = cards.tally
+  def hand_type(tally)
     jokers = tally.delete(?J) || 0
     counts = tally.values.sort
     if counts.empty?
@@ -33,17 +36,20 @@ module PartTwo
     else
       counts[-1] += jokers
     end
-    [
-      HAND_STRENGTH.fetch(counts),
-      *cards.map { CARD_STRENGTH.fetch(_1) },
-    ]
+    HAND_STRENGTH.fetch(counts)
   end
 end
 
 hands = ARGF.read.scan(/(\w+)\s+(\d+)/).to_h { [_1.chars, _2.to_i ] }
 
+part_one = PartOne.new
+p hands
+  .sort_by {|(hand,_)| part_one.strength(hand) }
+  .map.with_index {|(_,bid),i| bid * (i+1) }
+  .sum
+
+part_two = PartTwo.new
 p hands
-  # .sort_by {|(hand,_)| PartOne::strength(hand) }
-  .sort_by {|(hand,_)| PartTwo::strength(hand) }
+  .sort_by {|(hand,_)| part_two.strength(hand) }
   .map.with_index {|(_,bid),i| bid * (i+1) }
   .sum