Scala 归约操作- - - - -reduce

object 归约操作_reduce {
  def main(args: Array[String]): Unit = {
    val list=List(,,,,)
    val result=list.reduce(_+_)
    println("结果1为:"+result)
    println("结果2为:"+list.reduceLeft(_+_))
    println("结果3为:"+list.reduceRight(_+_))
    println("结果4为:"+list.reduce(_-_))     //reduce默认相当于使用reduceLeft
    println("结果5为:"+list.reduceLeft(_-_))
    println("结果6为:"+list.reduceRight(_-_))
  }
}

结果1为:
结果2为:
结果3为:
结果4为:-
结果5为:-
结果6为: