find the standard deviation of all nodes in a linked list in javascript

index.tsx
function calcStdDeviation(head) {
  // Step 1: calculate the mean
  let sum = 0;
  let count = 0;
  let curr = head;
  while (curr) {
    sum += curr.value;
    count++;
    curr = curr.next;
  }
  const mean = sum / count;

  // Step 2: calculate the sum of squared differences
  let squaredDiffSum = 0;
  curr = head;
  while (curr) {
    squaredDiffSum += (curr.value - mean) ** 2;
    curr = curr.next;
  }

  // Step 3: calculate the variance
  const variance = squaredDiffSum / count;

  // Step 4: calculate the standard deviation
  const stdDev = Math.sqrt(variance);

  return stdDev;
}
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