Código produzido na live "A verdadeira Orientação a Objetos" em 09/02/2023

oop.rb

####################################
# Pilares da Orientação a Objetos: #
####################################

# 👍 Abstração.     | >
# 👍 Encapsulamento | > > Composição 🙌
# 👍 Polimorfismo   | >

# 👎 Herança


require 'json'

class Person
  # attr_accessor :age, :name
  attr_reader :age, :name

  def initialize(name:, age:)
    @age = age
    @name = name
  end

  def say_hi
    puts "Hi, my name is #{@name}"
  end
end

# ------------------------------

module FormatToJSON
  def self.call(person)
    {name: person.name, age: person.age}.to_json
  end
end

module FormatToHTML
  def self.call(person)
    "<strong>#{person.name}</strong>"
  end
end

module PrintPerson
  def self.print(person, format)
    puts format.call(person)
  end
end

serradura = Person.new(name: 'Serradura', age: 36)

PrintPerson.print(serradura, FormatToHTML)

PrintPerson.print(serradura, FormatToJSON)

puts

Inspect = ->(person) { person.inspect }

PrintPerson.print(serradura, Inspect)

puts

module Format
  PrepareText =->(value) { value.upcase }

  module ToJSON
    def self.call(person)
      PrepareText[{name: person.name, age: person.age}.to_json]
    end
  end

  module ToHTML
    def self.call(person)
      PrepareText["<strong>#{person.name}</strong>"]
    end
  end
end

PrintPerson.print(person, Format::ToHTML)

PrintPerson.print(person, Format::ToJSON)

# ------------------------------

class BaseFormatter
  attr_reader :person

  def initialize(person)
    @person = person
  end

  def call
    raise NotImplementedError
  end
end

class JSONFormatter < BaseFormatter
  def call
    {name: person.name, age: person.age}.to_json
  end
end

class HTMLFormatter < BaseFormatter
  def call
    "<strong>#{person.name}</strong>"
  end
end

module DisplayPerson
  def self.call(person, formatter)
    puts formatter.new(person).call
  end
end

DisplayPerson.call(person, HTMLFormatter)
DisplayPerson.call(person, JSONFormatter)