func Sqrt(x float64) float64 {
	z := 1.0
	for {
		oldZ := z
		z -= (z*z - x) / (2 * z)
		if math.Abs(oldZ-z) <= 0.00000001 {
			break
		}
	}
	return z
}

function sqrt(n) {
  let z = 1.0;
  while (true) {
    let oldZ = z;
    z -= (z * z - n) / (2 * z);
    if (Math.abs(oldZ - z) <= 0.00000001) break;
  }
  return z;
}