p.133-134 complexed outstanding(extract method "calculate_outstanding").

kono · May 11, 2010 · a491eca · a491eca
1 parent 3a1facb
commit a491eca
Showing 1 changed file with 5 additions and 7 deletions.
diff --git a/chapter6/Extract_Method.rb b/chapter6/Extract_Method.rb
@@ -20,12 +20,7 @@ def print_owing(previous_amount)
     outstanding = previous_amount * 1.2
 
     print_banner
-
-    # 勘定を計算(calculate outstanding)
-    @orders.each do |order|
-      outstanding += order.amount
-    end
-
+    outstanding = calculate_outstanding(outstanding)
     print_details outstanding
   end
 
@@ -41,5 +36,8 @@ def print_details(outstanding)
     puts "name: #{@name}"
     puts "amount: #{outstanding}"
   end
-
+
+  def calculate_outstanding(initial_value)
+    @orders.inject(initial_value){|result, order| result + order.amount}
+  end
 end