[2023][ruby][9.x] dry

2023/ruby/day_09.rb

@@ -1,26 +1,17 @@
 histories = ARGF.readlines.map { _1.scan(/-?\d+/).map(&:to_i) }
 
-# part one
+history_diffs = histories.map {|history|
-p histories
+  diffs = [history]
-  .map {|history|
+  until diffs.last.all?(&:zero?)
-    diffs = [history]
+    diffs << diffs.last.each_cons(2).map { _2 - _1 }
-    until diffs.last.all?(&:zero?)
+  end
-      diffs << diffs.last.each_cons(2).map { _2 - _1 }
+  diffs
-    end
+}
 
-    diffs.sum(&:last)
+# part one
-  }
+p history_diffs.sum { _1.sum(&:last) }
-  .sum
 
 # part two
-p histories
+p history_diffs.sum {|diffs|
-  .map {|history|
+  diffs.map(&:first).reverse.inject { _2 - _1 }
-    diffs = [history]
+}
-    until diffs.last.all?(&:zero?)
-      diffs << diffs.last.each_cons(2).map { _2 - _1 }
-    end
-
-    diffs.map(&:first).reverse.inject { _2 - _1 }
-  }
-  .sum
-