In large programs, we cannot remember
the order in which Ruby will look up
methods. It turns out, we don't need to
remember that.
We can ask Ruby to give us that order.
Here, we can see that first Ruby
will look for the method
in the Person class itself
and
then in module Info2 and
then in module Info1.
For the modules, it's simply
preferring the ones that are
included later, so essentially,
it will feel like it is checking
for the method in a bottom-to-top
manner.
We can also ask Ruby what
modules are included.
From this, it's clear that
Info2, Info1 and Kernel
are modules.
The Kernel module
is one which is included in
the basic Object class of Ruby.
This class is by default added as
a parent to all Ruby classes. This means
that the Kernel module methods
will be available to all
the instances of any class.