Reverse Vowels of a String

My Solution

JavaScript / TypeScript

const reverseVowels = (s: string): string => {
  const vowelAsciiMap: Record<string, number> = {
    a: 97,
    e: 101,
    i: 105,
    o: 111,
    u: 117
  };

  let i = 0,
    j = s.length - 1,
    reversed = s.split("");

  while (i < j) {
    let leftCharInMap = reversed[i].toLowerCase() in vowelAsciiMap,
      rightCharInMap = reversed[j].toLowerCase() in vowelAsciiMap;

    if (leftCharInMap && rightCharInMap) {
      [reversed[i], reversed[j]] = [reversed[j], reversed[i]];
      i += 1;
      j -= 1;
    } else if (!leftCharInMap) {
      i += 1;
    } else if (!rightCharInMap) {
      j -= 1;
    }
  }

  return reversed.join("");
};