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Message: [QUOTE="Logan Capaldo, post: 4498111"] Array.method_defined?(:partition) #=> true Enumerable.method_defined?(:partition) #=> true Same for instance_methods.include?. If we loop forward through ancestors, we get Array as the answer. If we loop backwards we get Enumerable. The problem is, looping backwards will get us the wrong answer if Array overrides partition. I can't think of a good why to do this unless there is a Class#overrides? method. (e.g. Array.overrides?(:partition) #=> false ). [/QUOTE]