Kotlin中run, with, let, also and apply使用方法

with(webview.setting){
    javaScriptEnabled = true
    databaseEnabled = true
}

webview.settings.run {
    javaScriptEnabled = true
    databaseEnabled = true
}

with(webview.settings) {
      this?.javaScriptEnabled = true
      this?.databaseEnabled = true
   }
}

webview.settings?.run {
    javaScriptEnabled = true
    databaseEnabled = true
}

string?.run {
      println("The length of this String is $length")
}

string?.let {
      println("The length of this String is ${it.length}")
}

//通常写法
fun createInstance(args:Bundle):MyFragment{
    val fragment=MyFragment()
    fragment.arguments=args
    return fragment
}
//改进后的写法
fun createInstance(args:Bundle)=MyFragment().apply{arguments=args}

//通常写法
fun createIntent(datas:String,actionData:String):Intent{
    val intent=Intent()
    intent.action=actionData
    intent.data=Uri.parse(datas)
    return intent
}
//改进后的写法
fun createIntent(datas:String,actionData:String)=
                  Intent().apply{action=actionData}
                          .apply{data=datas}