Question

我读了一种创建哈希的方法，如下所示。当我尝试添加已存在的电影时，ruby不会返回正确的字符串。如果我放置一个常规哈希（例如movies = {Pirates: 3, James_Bond: 4}），它会正确返回。谁能解释为什么会这样呢？

movie = %w(Pirates James_Bond Finding_Nemo)
rating = [4, 3, 5]
movies = Hash[movie.zip(rating)]
puts "What would you like to do?"
choice = gets.chomp
case choice
  when "add"
    puts "What title would you like to add?"
    title = gets.chomp
    if movies[title.to_sym].nil?
      puts "What is the rating of this movie?"
      rating = gets.chomp
      movies[title.to_sym] = rating.to_i
    else
      puts "Movie already exists."
    end
end

Answer 1

就是这样。

movies[title.to_sym] = rating.to_i

%w运算符创建字符串数组，而不是符号。你应该这样做：

movies[title.to_s] = rating.to_i

或者您可以使用%i运算符创建符号数组。选择你真正想要的运营商（感谢@muistooshort）

%w(Pirates James_Bond Finding_Nemo) # => ["Pirates", "James_Bond", "Finding_Nemo"]
%i(Pirates James_Bond Finding_Nemo) # => [:Pirates, :James_Bond, :Finding_Nemo]

哈希没有得到承认

1 个答案: