Question

请举个例子，我是新来的返回成分的数量。对ruby不熟悉并且有语法概率。

class Recipe
  include Enumerable
  attr_reader :name

  def initialize(name, cuisine, ingredients, steps)
    @name        = name
    @cuisine     = cuisine
    @ingredients = ingredients
    @steps       = steps
  end

  def name
    @name
  end

  def cuisine
    @cuisine
  end

  def ingredients
    @ingredients
  end

  def steps
    @steps
  end

  def display
    puts "Recepie Manager"
    puts "\n Name:", @name, "\n Cuisine:", @cuisine ,"\n Ingredients and Quantity:", @ingredients, "Steps:", @steps 
  end

  def how_many_ingredients
    puts "Number of Ingridents:" , @ingredients
  end
end

obj1 = Recipe.new('Briyani', 'Indian','chicken,rice,spices,blah,blah','cook and eat')

obj1.display

Answer 1

从代码中看起来您错放了end语句。你必须在结束后创建类的对象。

class Receipe
    include Enumerable
    attr_reader :name

    def initialize(name, cuisine, ingredients, steps)
        @name = name
        @cuisine = cuisine
        @ingredients = ingredients
        @steps = steps
    end

    def name
        @name
    end

    def cuisine
        @cuisine
    end

    def ingredients
        @ingredients
    end

    def steps
        @steps
    end

    def display
         puts "Recepie Manager"
         puts "\n Name:", @name, "\n Cuisine:", @cuisine ,"\n Ingredients and Quantity:", @ingredients, "Steps:", @steps 
    end

    def how_many_ingredients
        puts "Number of Ingridents:" , @ingredients
    end

end

obj1 = Receipe.new('Briyani', 'Indian','chicken,rice,spices,blah,blah','cook and eat')

obj1.display

Answer 2

谢谢，

我使用了我的大师＆＃34; Google＆＃34;寻找解决方案。为了返回成分计数，我使用了分割和计数方法。

def how_many_ingredients
    ingredients = @ingredients.split(",")
    puts "Number of Ingridents:" , ingredients.count
end

Answer 3

你可以使用gets.chomp来获取用户的意见，如果这就是你的意思

类Receipe 包括可枚举 attr_reader：name

    def initialize(name, cuisine, ingredients, steps)
        @name = name
        @cuisine = cuisine
        @ingredients = ingredients
        @steps = steps
    end

    def name
        @name
    end

    def cuisine
        @cuisine
    end

    def ingredients
        @ingredients
    end

    def steps
        @steps
    end

    def display
         puts "Recepie Manager"
         puts "\n Name:", @name, "\n Cuisine:", @cuisine ,"\n Ingredients and Quantity:", @ingredients, "Steps:", @steps 
    end

    def how_many_ingredients
        puts "Number of Ingridents:" , @ingredients
    end

end
yourname = gets.chomp
yourcuisine = gets.chomp
youringridents = gets.chomp
yoursteps = gets.chomp

obj1 = Receipe.new(yourname, yourcuisine,youringridents,yoursteps)

obj1.display

用于从用户获取输入的ruby代码

3 个答案: