Anonymous avatar Anonymous committed 27eb407

Some nice methods for the List monad.

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