public_method_defined?(p1) public

Returns true if the named public method is defined by mod (or its included modules and, if mod is a class, its ancestors). 

   module A
     def method1()  end
   end
   class B
     protected
     def method2()  end
   end
   class C < B
     include A
     def method3()  end
   end

   A.method_defined? :method1           #=> true
   C.public_method_defined? "method1"   #=> true
   C.public_method_defined? "method2"   #=> false
   C.method_defined? "method2"          #=> true
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