这是一个令人讨厌的全球混乱吗

Question

我听说某些做法（如全局变量）经常不受欢迎。我想知道在下面显示的级别上放置哈希是否通常也不受欢迎。如果是这样的话，应该如何做才能让人对它微笑呢？

class Dictionary
  @@dictionary_hash = {"Apple"=>"Apples are tasty"}
  def new_word
    puts "Please type a word and press enter"
    new_word = gets.chomp.upcase
    puts "Thanks. You typed: #{new_word}"
    @@dictionary_hash[new_word] = "#{new_word} means something about something. More on this later."
    D.finalize
    return new_word.to_str
  end
  def finalize
    puts "To enter more, press Y then press Enter. Otherwise just press Enter."
    user_choice = gets.chomp.upcase
    if user_choice == "Y"
      D.new_word
    else
      puts @@dictionary_hash
    end
  end
  D = Dictionary.new
  D.new_word
end

Answer 1

您应该检查以下两者之间的差异：

• 全局变量、类变量和实例变量
• 类和实例方法

您接近于一个具有实例变量的工作示例：

class Dictionary
  def initialize
    @dictionary_hash = {"Apple"=>"Apples are tasty"}   
  end
  def new_word
    puts "Please type a word and press enter"
    new_word = gets.chomp.upcase
    puts "Thanks. You typed: #{new_word}"
    @dictionary_hash[new_word] = "#{new_word} means something about something. More on this later."
    finalize      
    new_word
  end
  def finalize
    puts "To enter more, press Y then press Enter. Otherwise just press Enter."
    user_choice = gets.chomp.upcase
    if user_choice == "Y"
      new_word
    else
      puts @dictionary_hash
    end
  end
end
d = Dictionary.new
d.new_word