Usando a composição ao seu favor com dry-monads

example.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'pry'
  gem 'dry-monads'
end

require 'dry/monads'

class ResolveFullName
  include Dry::Monads[:result, :do]

  def call(first_name:, last_name:, **)
    first = String(first_name)
    last = String(last_name)

    return Failure('The name must be 3 characters') if first.size <= 2

    value = yield normalize_str(first, last)
    result = yield resolve_name(value)

    Success(result)
  end

  private

  def normalize_str(first, last)
    Success([first.strip!, last.strip!].map(&:downcase))
  end

  def resolve_name(arr_names)
    Success(arr_names.join(' '))
  end
end

module PromotionMailer
  extend Dry::Monads[:result]

  def self.call(name, email, content = 'Ofertas com 80% de desconto!')
    # Generic class to send email
    attrs = {
      to: email,
      name: name,
      content: content
    }

    p '✉️ sending email...'
    Success(attrs)
  end
end

module WriteLog
  extend Dry::Monads[:result]

  def self.call(**args)
    puts 'Writing in the logs...'
    sleep(1)
    puts args
    puts '🎉 Done!'
    Success('Done!')
  end
end

result = ResolveFullName.new

result
  .call(first_name: '  aristoteles', last_name: 'COUTINHO ')
  .bind(PromotionMailer, 'aristotelesbr@gmail.com')
  .bind(WriteLog)


# Usando a composição ao seu favor com dry-monads
# 👉🏻 https://www.aristotelescoutinho.com.br/usando-a-composição-ao-seu-favor-com-dy-monads