函數(shù)的默認參數(shù)
過濾list val = positives = list.filter{ it > 0}
字符串內(nèi)插 println("name $name")
類型判斷 when(x){
單表達式函數(shù)
對一個對象實例調(diào)用多個方法
class Turtle {
fun penDown()
fun penUp()
fun turn(degrees: Double)
fun forward(pixels: Double)
}
val turtle = Turtle()
with(myTurtle){
penDown()
for(i in 1..4){
forward(100.0)
turn(90.0)
}
penUp()
}