let run also apply use - 图1
    let run also apply use - 图2

    • 推荐使用 let also use ，接收receiver 很容易在里面嵌套很多receiver
    1. class Watch(var name:String)
    2. fun main() {
    3.     val watch = Watch("xiaomi")
    4.     watch.let {
    5.         println(it)
    6.     }
    7.     watch.also {
    8.         println(it)
    9.     }
    10.     watch.run {
    11.         println(this)
    12.     }
    13.     watch.apply {
    14.         println(this)
    15.     }
    16. }
    • let also 里面使用 it
    • run apply 使用 this