jinhucheung · December 27, 2018 13:27 · Dec 27, 2018 · Dec 27, 2018 · Dec 27, 2018
diff --git a/base.rb b/base.rb
@@ -17,4 +17,7 @@ def post
   def delete
     puts 'delete!'
   end
-end
+end
+
+Postman.post    #=> 'post!'
+Postman.delete  #=> 'delete!'
diff --git a/base_on_rails.rb b/base_on_rails.rb
@@ -14,4 +14,7 @@ def post
   def delete
     puts 'delete!'
   end
-end
+end
+
+Postman.post    #=> 'post!'
+Postman.delete  #=> 'delete!'
diff --git a/base.rb b/base.rb
@@ -0,0 +1,20 @@
+require 'singleton'
+require 'forwardable'
+
+class Postman
+  include Singleton
+
+  class << self
+    extend Forwardable
+
+    def_delegators :instance, :post, :delete
+  end
+
+  def post
+    puts 'post!'
+  end
+
+  def delete
+    puts 'delete!'
+  end
+end
diff --git a/base_on_rails.rb b/base_on_rails.rb
@@ -0,0 +1,17 @@
+require 'singleton'
+
+class Postman
+  include Singleton
+
+  class << self
+    delegate :post, :delete, to: :instance
+  end
+
+  def post
+    puts 'post!'
+  end
+
+  def delete
+    puts 'delete!'
+  end
+end
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