high_cohesion_example.rb

class Company

  def open_headquarter headquarter
    @headquarters << headquarter
  end

  def close_headquarter(headquarter_name)
    @headquarters.delete_if{ |headquater| headquarter.name == headquarter_name }
  end
end

class Headquater
  def initialize(name,  positions=[])
    @name = name
    @positions = positions
  end

  def add_position position
    @positions << position
  end
end

class Position
  def initialize(name, base_salary)
    @name = name
    @base_salary = base_salary
  end

  def change_base_salary new_salary
    @base_salary = new_salary
  end

  def hire_employee employee
    @employees << employee
  end
end

class Employee
  def initialize(name)
    @name = name
  end
end