Ruby递归函数 [英] Ruby recursive function

问题描述

我在从递归函数返回值时遇到问题.

I've problem returning value from recursive function.

def ask_question(question)
    print question
    answer = STDIN.gets.chomp

    ask_question question if answer.empty?
    return answer
end

第一次正确返回 answer ，但是在下次通话中我得到了空字符串.为什么会这样?

The first time the answer is returned properly but I got empty string in next calls. Why is that?

推荐答案

那是因为您没有返回递归调用 ask_question 所返回的值.

That is because you aren't returning the value returned by your recursive calls to ask_question.

def ask_question(question)
    print question
    answer = STDIN.gets.chomp
    answer = ask_question question if answer.empty?
    return answer;
end

您要做的就是在方法完成后返回第一个用户输入值(在您的情况下为空字符串).

All you were doing is returning the first user input value (in your case an empty string) when the method was done.

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