scala学习笔记：无参函数

scala> def repeat(times:Int)(run:()=>Unit)=for(i<-1 to times)run()
repeat: (times: Int)(run: () => Unit)Unit

scala> repeat(2){println("haha~~~")}
<console>:9: error: type mismatch;
found   : Unit
required: () => Unit
repeat(2){println("haha~~~")}
^

scala> repeat(2){()=>println("haha~~~")}
haha~~~
haha~~~

scala> def repeat(times:Int)(run: =>Unit)=for(i<-1 to times)run
repeat: (times: Int)(run: => Unit)Unit

scala> repeat(2){println("haha~~~")}
haha~~~
haha~~~