Ruby错误:找不到循环中定义的变量

Question

我在Ruby中有代码，它在循环中定义变量。

print("What difficulty do you want on a scale of 1-5?\n")
loop do
  difficulty = gets.to_i
  break if difficulty == 1 or difficulty == 2 or difficulty == 3 or difficulty == 4 or difficulty == 5
end
range = 10 if difficulty == 1
range = 100 if difficulty == 2
range = 500 if difficulty == 3
range = 1000 if difficulty == 4
range = 5000 if difficulty == 5

我得到一个错误，那就是变量的难度是未知的。我认为这是循环中的一个问题。我不知道如何把它变成另一种形式，以达到同样的目的。有什么办法可以使变量全局化吗？我试着寻找其他的方法，使它以另一种格式，但没有任何帮助。

Answer 1

您可以在循环之外定义它，否则，它将受到范围限制。

尝试：

difficulty_range = {
  1 => 10,
  2 => 100,
  3 => 500,
  4 => 1000,
  5 => 5000
}

difficulty = nil

loop do
  print("What difficulty do you want on a scale of 1-5?\n")
  difficulty = gets.to_i
  break if (1..5).include?(difficulty)
end

p difficulty_range[difficulty]