checking if a method is defined on the class

Question

How do I check if a method is defined on some class directly, not by inheritance or by inclusion/extension? I want something like \'foo?\' in the following:

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Answer 1

For objects you can use Object.respond_to?.

Returns true if obj responds to the given method.

For classes take a look at Module.instance_methods

Returns an array containing the names of the public and protected instance methods in the receiver.