aristotelesbr · March 23, 2021 23:20 · Mar 23, 2021
diff --git a/example.rb b/example.rb
@@ -0,0 +1,75 @@
+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
+