Чередующиеся персонажи

function superReducedString(s) {
  let left = 0;
  let right = 1;
  let count = 0;
  while (right <= s.length) {
    if (s[left] === s[right]) {
      count++;
    }
    left++;
    right++;
  }

  return count;
}

console.log("Answere here ====>", superReducedString("AAAA"));