345. Reverse Vowels of a String

Write a function that takes a string as input and reverse only the vowels of a string.

Example 1:

Input: "hello"
Output: "holle"

Example 2:

Input: "leetcode"
Output: "leotcede"

Note:
The vowels does not include the letter “y”.

/**
 * @param {string} s
 * @return {string}
 */
var reverseVowels = function(s) {
    const vowelMap = {
        'a': true,
        'e': true,
        'i': true,
        'o': true,
        'u': true,
        'A': true,
        'E': true,
        'I': true,
        'O': true,
        'U': true,
    };
    let tmp;
    let i = 0;
    let j = s.length - 1;
    s = s.split('');
    while (j > i) {
        if (vowelMap[s[i]] && vowelMap[s[j]]) {
            tmp = s[i];
            s[i] = s[j];
            s[j] = tmp;
            i++;
            j--;
        } else {
            if (!vowelMap[s[i]]) {
                i++;
            }
            if (!vowelMap[s[j]]) {
                j--;
            }
        }
    }
    return s.join('');
};