Ruby modules and extend self -

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In what sort of code the code is: 

  Module M extends the DF greetings itself "Hello" and end

Use something more beneficial to use: 

  Module M def self.greet puts "hello" end of end

On the top, one example example is being expanded, and later only there is a class method, but when you call any method, then you have to make an M. graph Hoog , Is not it? I was just curious if someone could put some light on another using a code thanks!

The first example is usually a way for people to get the functionality of module_function (When they do not know the existence of this method).

A module_function is both an example method and a class method. The method in your second code example is just a class method.


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