Renewable Objects (Immutability by Default) — A more Functional way to do OOP

example.rb

class Person
  include Renewable
  attr_accessor :name, :age
  
  def celebrate_birthday
    self.renew(age: age + 1)
  end
end

john = Person.new(name: 'John', age: 24)

john.name             # 'John'
john.name = 'Brandon' # NoMethodError

jack = john.renew(name: 'Jack')

new_john = john.celebrate_birthday

renewable.rb

module Renewable
  def initialize(attributes = {})
    # Iterates through provided attributes and sets the
    # instance variables before freezing the object.
  end
  
  def renew(attributes = {})
    # Duplicates self and updates the provided attributes,
    # freezes the new instance and returns it.
  end
  
  module ClassMethods
    def attr_accessor
      # Sets up standard getter
      # Bypasses creation of a setter
    end
  end
end