Anonymous avatar Anonymous committed 27eb407

Some nice methods for the List monad.

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Files changed (1)

lib/tweed/monads/list.rb

       define_monad do
         construct { |sequence| @sequence = sequence }
         unit { |value| self.new([value]) }
-        bind { |&block| self.new(@sequence.map(&block).inject(&:+)) }
-        zero [].freeze!
+        bind { |&block| self.class.new(@sequence.map(&block).inject(&:+)) }
+        zero { self.new([].freeze!) }
+      end
+      
+      def +(other)
+        self.class.new(@sequence, other.instance_eval { @sequence })
+      end
+      
+      def inspect
+        "#{self.class.inspect} :: #{@sequence.inspect}"
       end
     end # class List
   end # module Monads
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