lib/danica/operator/chained.rb in danica-2.0.3 vs lib/danica/operator/chained.rb in danica-2.0.4

@@ -3,10 +3,20 @@
     class Chained < Operator
       def to_f
         chain(variables.map(&:to_f))
       end
 
+      def include?(value)
+        value = wrap_value(value)
+        variables.include?(value)
+      end
+
       private
+
+      def repack(other)
+        other_variables = other.is_a?(self.class) ? other.variables : [ other ]
+        self.class.new(variables + other_variables)
+      end
 
       def tex_string
         (numeric_to_tex + non_numeric_variables.map(&:to_tex)).join(" #{tex_symbol} ")
       end