instance_methods

Returns an array containing the names of the public and protected instance methods in the receiver. For a module, these are the public and protected methods; for a class, they are the instance (not singleton) methods. If the optional parameter is false, the methods of any ancestors are not included.

module A
 def method1() end
end
class B
 include  A
 def method2() end
end
class C < B
 def method3() end
end
A.instance_methods (false) #=> [:method1]
B.instance_methods (false) #=> [:method2]
B.instance_methods (true).include? (:method1) #=> true
C.instance_methods (false) #=> [:method3]
C.instance_methods .include? (:method2) #=> true

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