Question

我听说全球变量等某些做法常常令人不悦。我想知道是否通常也不赞成将哈希放在下面所示的级别。如果是这样的话，应该如何做才能让它微笑？

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

您应该检查以下区别：

全局，类和实例变量
类和实例方法

您接近使用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

这是一个讨厌的全球哈希吗？

1 个答案: