Ruby on Rails

Methods attach themselves to whatever the current class is when they are
defined. If self is a class when the method is defined, then the method
becomes an instance method in that class. If self is not a class when
the method is defined, then the current class is self's class.


puts self
puts self.class

--output:--
main
Object


def do_stuff
end

self is the object called 'main', which ruby creates for you on startup,
and it is not a class, so do_stuff() attaches to self's class, which is
Object.

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