[TOC] # 定义函数 如果定义的时候没有加(),那么调用的时候也不能加() 函数其实在scala就是个对象,我们可以用个变量来引用他 ~~~ scala> val f1 = (x:Int, y:Int) => x+y f1: (Int, Int) => Int = $$Lambda$1068/185209393@4833eff3 scala> f1(1,2) res1: Int = 3 ~~~ 完整定义的函数 ~~~ scala> val f3:(Int, Double) => (Double, Int) = {(x:Int, y:Double) => (y,x)} f3: (Int, Double) => (Double, Int) = $$Lambda$1086/1751080205@3830b06c scala> f3(1, 1.3) res2: (Double, Int) = (1.3,1) ~~~ # 变长函数 ~~~ println(sum(1, 2, 3)) def sum(args: Int*) = { var result = 0 for (arg <- args) { result += arg } result } ~~~