一 reduceLeft简介
二 代码
scala> l.reduceLeft((x,y)=>x+y)
res16:Int=6
scala> l.reduceLeft(_+_)
res17:Int=6
三 flodLeft简介
四 代码
scala> l.foldLeft(0)(_+_)
res18:Int=6
scala> l.foldLeft(1)(_*_)
res19:Int=6
一 reduceLeft简介
scala> l.reduceLeft((x,y)=>x+y)
res16:Int=6
scala> l.reduceLeft(_+_)
res17:Int=6
scala> l.foldLeft(0)(_+_)
res18:Int=6
scala> l.foldLeft(1)(_*_)
res19:Int=6