BrayanZ

class Employee
  def initialize(name, base_salary)
    @name = name
    @base_salary = base_salary
  end
  
  def calculate_net_salary
    # business logic about how to calculate the net salary
  end
    

BrayanZ

class Employee
  def initialize(name, base_salary)
    @name = name
    @base_salary = base_salary
  end
  
  def calculate_net_salary
    # business logic about how to calculate the net salary
  end
end

BrayanZ

class Notification
  def initialze(kind, body)
    @kind, @body = kind, body
  end
  
  def send_sms_notification
    # sends a sms notification
  end
  
  def send_email_notification

BrayanZ

class SMSNotification < Notification
  def send
    # sends a sms notification
  end
end

class EmailNotification < Notification
  def send
   # sends an email with the notification
  end

BrayanZ

class Message
  attr_reader :status
  
  def initialize
    @status = :started
  end

  def cancel
    @status = :canceled
  end

BrayanZ

class Message
  attr_reader :status
  
  def initialize
    @status = :started
  end
  
  def can_be_cancelled?
    return true
  end

BrayanZ

module Tools
  def valid_email? email
    # ...
  end
  
  def send_email(from, to, message)
    #
  end
  
  def log(priority, message)

BrayanZ

module Tools
  module Mailer
    def valid_email? email
      # ...
    end
    
    def send_email(from, to, message)
      #
    end
  end

BrayanZ

class Something
  def initialize()
    @variable = AnotherThing.new
  end
end

BrayanZ

class Something
  def initialize(a_thing)
    @variable = a_thing
  end
end