未定义的方法 (NoMethodError) ruby

问题描述

我不断收到以下错误消息:

I keep getting the following error message:

text.rb:2:in `<main>': undefined method `choices' for main:Object (NoMethodError)

但我似乎无法理解为什么我的方法是未定义的":

But I can't seem to understand why my method is "undefined":

puts "Select [1] [2] [3] or [q] to quit"; users_choice = gets.chomp
choices(users_choice)

def choices (choice)
   while choice != 'q'
        case choice

        when '1'
            puts "you chose one!"

        when '2'
            puts "you chose two!"

        when '3'
            puts "you chose three!"
        end
   end
end

推荐答案

这是因为您在定义方法之前调用了 choices 方法.编写代码如下:

This is because you are calling method choices, before defining it. Write the code as below:

puts "Select [1] [2] [3] or [q] to quit"
users_choice = gets.chomp

def choices (choice)
  while choice != 'q'
    case choice
    when '1'
      break  puts "you chose one!"
    when '2'
      break puts "you chose two!"
    when '3'
      break  puts "you chose three!"
    end
  end
end

choices(users_choice)

我使用了 break 来退出 while 循环.否则会造成无限循环.

I used break, to exit from the while loop. Otherwise it will create an infinite loop.

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