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module ReadIngredients
  class << self
    include Enumerable

    def each
      while input = gets.chomp
        break if end_of_input?(input)

        yield input
      end
    end

    alias_method :with_object, :each_with_object

    private

    def end_of_input?(input)
      input == 'done'
    end
  end
end

ingredients = ReadIngredients.with_object([]) do |ingredient, ingredients|
  ingredients << ingredient
end
puts ingredients