class Solution {
  reverseVowels(s) {
    // TODO: Write your code here
    let pointerOne = s.length - 1;
    let pointerTwo = 0;
    let stringArray = Array.from(s);

    let hashMap = {
      "a": 1,
      "e": 1,
      "i": 1,
      "o": 1,
      "u": 1
    }

    while (pointerOne >= pointerTwo) {
      let currentChar = stringArray[pointerOne].toLowerCase()
      if (hashMap[currentChar]) { 
        let testChar = stringArray[pointerTwo].toLowerCase()

        if ( hashMap[testChar] ) {
          let holdChar = stringArray[pointerTwo];
          stringArray[pointerTwo] = stringArray[pointerOne];
          stringArray[pointerOne] = holdChar;
          pointerOne--;
          pointerTwo++;
        } else {
          pointerTwo++
        }
      } else {
        pointerOne--
      }

    }

    return stringArray.join('');
  }
}