What is the primary difference between module_function and extend self in Ruby?

Question

Admin · Accepted Answer

module_function makes the specified methods accessible as module methods, while extend self makes them accessible as instance methods

Admin · Answer

module_function makes the specified methods private, while extend self makes them public

Admin · Answer

module_function creates a new module, while extend self extends the current module

Admin · Answer

module_function makes the specified methods singleton methods, while extend self makes them instance methods

Q. What is the primary difference between module_function and extend self in Ruby?