part5.rb

part5.rb

@@ -2,20 +2,50 @@ class Class
 
   def attr_accessor_with_history(attr_name)
     attr_name = attr_name.to_s # make sure it's a string
-    attr_reader attr_name # create the attribute's
-    getter
-    attr_reader attr_name+"_history" # create bar_history
-    getter
-    class_eval "your code here, use %Q for multiline strings"
+    attr_reader attr_name # create the attribute's getter
+    attr_reader attr_name+"_history" # create bar_history getter
+
+
+    class_eval %Q{
+      
+      def #{attr_name}_history
+        @#{attr_name}_history
+      end
+      
+      def #{attr_name}_history=(value)
+      
+                        
+	      @#{attr_name}_history = value
+	    end
+     
+      def #{attr_name}
+        @#{attr_name}
+      end
+      
+      def #{attr_name}=(value)
+        
+        @#{attr_name}_history << value
+	      @#{attr_name} = value
+	    end
+	    
+
+        
+    }
   end
 
 end
 
 class Foo
+  def initialize()
+    @bar 
+    @bar_history = Array.new
+    @bar_history << @bar
+  end
+
   attr_accessor_with_history :bar
 end
 
 f = Foo.new
-f.bar = 1
-f.bar = 2
-f.bar_history # => if your code works, should be [nil,1,2]
+print f.bar = 1, "\n"
+print f.bar = 2, "\n"
+print f.bar_history, "\n" # => if your code works, should be [nil,1,2]

part5.rb~

@@ -0,0 +1,51 @@
+class Class
+
+  def attr_accessor_with_history(attr_name)
+    attr_name = attr_name.to_s # make sure it's a string
+    attr_reader attr_name # create the attribute's getter
+    attr_reader attr_name+"_history" # create bar_history getter
+
+
+    class_eval %Q{
+
+      def #{attr_name}_history
+        @#{attr_name}_history
+      end
+
+      def #{attr_name}_history=(value)
+
+
+	      @#{attr_name}_history = value
+	    end
+
+      def #{attr_name}
+        @#{attr_name}
+      end
+
+      def #{attr_name}=(value)
+
+        @#{attr_name}_history << value
+	      @#{attr_name} = value
+	    end
+
+
+
+    }
+  end
+
+end
+
+class Foo
+  def initialize()
+    @bar 
+    @bar_history = Array.new
+    @bar_history << @bar
+  end
+
+  attr_accessor_with_history :bar
+end
+
+f = Foo.new
+print f.bar = 1, "\n"
+print f.bar = 2, "\n"
+print f.bar_history, "\n" # => if your code works, should be [nil,1,2]