从哈希中随机化键值对

Question

我正在构建一个简单的词汇测验，它为用户提供来自预定散列的值，并将他或她的回答作为输入。如果用户的输入与该值的对应键匹配，则程序继续执行下一个值，并重复此过程，直到哈希中的所有键值对都已计算在内。

在当前状态下，测验从第一个到最后一个顺序提示用户哈希值。

但是，为了使测验更加困难，我希望测验提供哈希中的随机值，不按特定顺序。

简单的英语...如何让词汇测验从其库中随机输出定义，而不是每次都以相同的顺序打印相同的定义？

我的代码如下。非常感谢大家的帮助！

vocab_words = {
  "class" => "Tell Ruby to make a new type of thing",
  "object" => "Two meanings: The most basic type of thing, and any instance of some thing",
  "instance" => "What you get when you tell Ruby to create a class",
  "def" => "How you define a function inside a class"
}

vocab_words.each do |word, definition|
  print vocab_words[word] + ": "
  answer = gets.to_s.chomp.downcase

    while answer != "%s" %word
      if answer == "help"
        print "The answer is \"%s.\" Type it here: " %word
        answer = gets.to_s.chomp.downcase
      else
        print "Nope. Try again: "
        answer = gets.to_s.chomp.downcase
      end
    end
  end

Answer 1

使用：random_keys = vocab_words.keys.shuffle 像这样：

vocab_words = {
  "class" => "Tell Ruby to make a new type of thing",
  "object" => "Two meanings: The most basic type of thing, and any instance of some thing",
  "instance" => "What you get when you tell Ruby to create a class",
  "def" => "How you define a function inside a class"
}

random_keys = vocab_words.keys.shuffle
random_keys.each do |word|
  print vocab_words[word] + ": "
  answer = gets.to_s.chomp.downcase

  if answer == "help"
    print "The answer is \"%s.\" Type it here: " %word
    answer = gets.to_s.chomp.downcase
  else
    while answer != "%s" %word
      print "Nope. Try again: "
      answer = gets.to_s.chomp.downcase
    end
  end
end