簡單的 Scaladoc 方法

/**
  * Explain briefly what method does here
  * @param x Explain briefly what should be x and how this affects the method.
  * @param y Explain briefly what should be y and how this affects the method.
  * @return Explain what is returned from execution.
  */
def method(x: Int, y: String): Option[Double] = {
  // Method content
}