1.方法转换为函数
scala> def m(x:Int,y:Int) = x*y
m: (x: Int, y: Int)Int
scala> val f = m _
f: (Int, Int) => Int =
2.集合中的每一个元素
scala> val list = List(1,2,3,4)
list: List[Int] = List(1, 2, 3, 4)
scala> val list2 = list.map(_ * 5)
list2: List[Int] = List(5, 10, 15, 20)
3.获取元组tuple中的元素
scala> val t = (“hadoo
