345. Reverse Vowels of a String

https://leetcode.com/problems/reverse-vowels-of-a-string/

JavaScript

/**
 * @param {string} s
 * @return {string}
 */
var reverseVowels = function(s) {
    const cs = s.split('')
    const vowels = 'aeiouAEIOU'
    let l = 0
    let r = s.length - 1

    while (l < r) {
        if (vowels.indexOf(cs[l]) >= 0 && vowels.indexOf(cs[r]) >= 0) {
            let temp = cs[r]
            cs[r] = cs[l]
            cs[l] = temp
            l++
            r--
        } else if (vowels.indexOf(cs[l]) >= 0) {
            r--
        } else {
            l++
        }
    }

    return cs.join('')
}

Python

class Solution:

    def reverseVowels(self, s):
        """
        :type s: str
        :rtype: str
        """
        vowels = 'aeiouAEIOU'
        l = 0
        r = len(s) - 1
        cs = list(s)

        while l < r:
            if cs[l] in vowels and cs[r] in vowels:
                cs[l], cs[r] = cs[r], cs[l]
                l += 1
                r -= 1
            elif s[l] in vowels:
                r -= 1
            else:
                l += 1

        return ''.join(cs)