Reverse Vowels of a String

class Solution {
public:
    string reverseVowels(string s) {
        auto isVowel = [](char c) {
            c = tolower((unsigned char)c);
            return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
        };
        int l = 0, r = s.size() - 1;
        while (l < r) {
            while (l < r && !isVowel(s[l])) ++l;
            while (l < r && !isVowel(s[r])) --r;
            if (l < r) swap(s[l++], s[r--]);
        }
        return s;
    }
};

func reverseVowels(s string) string {
    isVowel := func(c byte) bool {
        if c >= 'A' && c <= 'Z' {
            c += 32
        }
        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'
    }
    b := []byte(s)
    l, r := 0, len(b)-1
    for l < r {
        for l < r && !isVowel(b[l]) {
            l++
        }
        for l < r && !isVowel(b[r]) {
            r--
        }
        if l < r {
            b[l], b[r] = b[r], b[l]
            l++
            r--
        }
    }
    return string(b)
}

class Solution:
    def reverseVowels(self, s: str) -> str:
        vowels = set('aeiouAEIOU')
        b = list(s)
        l, r = 0, len(b) - 1
        while l < r:
            while l < r and b[l] not in vowels:
                l += 1
            while l < r and b[r] not in vowels:
                r -= 1
            if l < r:
                b[l], b[r] = b[r], b[l]
                l += 1
                r -= 1
        return ''.join(b)

function reverseVowels(s) {
    const vowels = new Set('aeiouAEIOU');
    const b = s.split('');
    let l = 0, r = b.length - 1;
    while (l < r) {
        while (l < r && !vowels.has(b[l])) l++;
        while (l < r && !vowels.has(b[r])) r--;
        if (l < r) {
            [b[l], b[r]] = [b[r], b[l]];
            l++;
            r--;
        }
    }
    return b.join('');
}

class Solution {
    public String reverseVowels(String s) {
        char[] b = s.toCharArray();
        int l = 0, r = b.length - 1;
        while (l < r) {
            while (l < r && !isVowel(b[l])) l++;
            while (l < r && !isVowel(b[r])) r--;
            if (l < r) {
                char tmp = b[l];
                b[l++] = b[r];
                b[r--] = tmp;
            }
        }
        return new String(b);
    }

    private boolean isVowel(char c) {
        if (c >= 'A' && c <= 'Z') c += 32;
        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
    }
}

function reverseVowels(s: string): string {
    const vowels: Set<string> = new Set('aeiouAEIOU');
    const b: string[] = s.split('');
    let l = 0, r = b.length - 1;
    while (l < r) {
        while (l < r && !vowels.has(b[l])) l++;
        while (l < r && !vowels.has(b[r])) r--;
        if (l < r) {
            [b[l], b[r]] = [b[r], b[l]];
            l++;
            r--;
        }
    }
    return b.join('');
}