Ruby: "Unexpected keyword_end"...但所有的开场白和闭幕式都匹配

Question

我正在编写一段代码，它将向用户返回第 n 个素数。第 19 行和第 22 行出现“unexpected keyword_end”语法错误。我在代码中添加了注释，以便您可以轻松找到错误的位置。

def nthPrime(n)
    number = 3
    primeNumber = 1
    i = 0
    primes = [2]
    #Iterates the number until we've found the desired number of primes.
    while primeNumber < n
        #Iterates through the prime numbers already found to locate prime factors.
        while i < primes.length
            #Returns TRUE if a prime factor is found.
            #If no prime factors are found, primeNumber ticks up by one, and the number
            #is added to the list of primes.
            if number % primes[i] != 0
                if i == primes.length
                    primes << number
                    i = 0
                else
                    i ++
                end #Unexpected keyword_end
            end
            number ++
        end #Unexpected keyword_end
    end
    puts number
end

nthPrime(6)

我查看了很多关于“unexpected keyword_end”错误的其他 Stack Overflow 问题，但所有这些问题都是由于作者的代码中有太多“end”而引起的。我相信，经过多次检查，我的代码中有正确数量的“结束”关闭器

还有什么问题？

Answer 1

写i ++如i += 1和 number ++如number += 1 . Ruby 不支持 ++或 --运营商。阅读这个问题 No increment operator (++) in Ruby?并阅读Why doesn't Ruby support i++ or i— (increment/decrement operators)?