Scala 列表中所有元素的算术运算

我会问如何在列表上执行算术运算

减法、除法、乘法

private def arithmeticOperations(leavesValues: List[Double]): Double = {
  op match {
    case '+' => leavesValues.sum
    case '-' => 0.0
    case '*' => 0.0
    case '/' => 0.0
    case _ => 0.0
  }
}

零应该被操作替换

private def arithmeticOperations(leavesValues: List[Double]): Double = {
  op match {
    case '+' => leavesValues.reduce(_ + _)
    case '-' => leavesValues.reduce(_ - _)
    case '*' => leavesValues.reduce(_ * _)
    case '/' => leavesValues.reduce(_ / _)
    case _ => 0.0
  }
}