Ruby Module Declaration [duplicate]

Answer 1

There is an additional difference between those declarations when inheritance is involved:

Let's assume Driver inherits from a Person class.

class Bus::Driver < Person
end

module Bus
  class Driver < Person
  end
end

When Ruby tries to resolve the Person constant, in the first declaration it only looks for ::Person. The second one looks for both Bus::Person and ::Person.

Depending on your circumstances this could make one declaration preferrable to the other.