● インスタンス変数を簡単に操作する

class Drink
    def name ———#①attr_reader :name
        @name
    end
    def name=(text) ———#②attr_write :name
        @name = text
    end
end

drink = Drink.new
drink.name="カフェラテ"
puts drink.name
↪️カフェラテ

①と②の省略できる書き方

class Drink
    attr_reader :name ———#①
    attr_writer :name ————#②
end

drink = Drink.new
drink.name="カフェラテ"
puts drink.name
↪️カフェラテ

①と②を合体させたattr_accessor

class Drink
    attr_accessor :name
end

drink = Drink.new
drink.name="カフェラテ"
puts drink.name
↪️カフェラテ