#udemyメモ studentクラス

Attributes, getters, setters - Text directions, references and code
Section 2, Lecture 50

.rb

class Student
  attr_accessor :first_name, :last_name, :email, :username, :password
# ゲッターとセッターをメタプロでやってる（動的プロキシ？ゴーストメソッド？違いがよくわかってない）
  def initialize(firstname, lastname, username, email, password)
# Studentクラスのオブジェクトを新しく作るときに初期化して、ついでにインスタンス変数をセット
    @first_name = firstname
    @last_name = lastname
    @username = username
    @email = email
    @password = password
  end
 
  def to_s
# to_sメソッドをオーバーライドしている
    "First name: #{@first_name}, Last name: #{@last_name}, Username: #{@username},
                  email address: #{@email}"
  end
 
end
 
mashrur = Student.new("Mashrur", "Hossain", "mashrur1", "[e-mail]",
                      "password1")
john = Student.new("John", "Doe", "john1", "[e-mail]",
                      "password2")
puts mashrur
puts john
mashrur.last_name = john.last_name
puts "Mashrur is altered"
puts mashrur
# putsメソッドはto_sが自動的に呼び出す。わざわざto_sオブジェクトに渡さなくてもいい。

$  ruby student.rb
puts mashrur => First name: Mashrur, Last name: Hossain, Username: mashrur1,
                  email address: [e-mail]
puts John => First name: John, Last name: Doe, Username: john1,
                  email address: [e-mail]
puts "Mashrur is altered" => Mashrur is altered
puts mashrur => First name: Mashrur, Last name: Doe, Username: mashrur1,
                  email address: [e-mail]