lib/rupture/list.rb in rupture-0.1.0 vs lib/rupture/list.rb in rupture-0.2.0

@@ -4,28 +4,26 @@
       alias create new
     end
     private_class_method :create
     attr_reader :seq, :size
 
-    def self.empty
-      @empty ||= create(nil, 0)
-    end
-
     def initialize(seq, size)
       @seq = seq.seq
       @size = size
     end
 
     def self.new(*args)
-      list = self.empty
+      list = Empty
       args.reverse_each do |x|
         list = list.conj(x)
       end
 
       list
     end
 
     def conj(x)
       self.class.send(:create, Cons.new(x, @seq), @size.inc)
     end
+
+    Empty = create(nil, 0)
   end
 end