Kotlin notes - popular knowledge points asterisk (*)

Variable parameter expansion operator

var permissions = arrayOf(
    Manifest.permission.CAMERA,
    Manifest.permission.READ_EXTERNAL_STORAGE,
    Manifest.permission.WRITE_EXTERNAL_STORAGE
)

requestEach(*permissions)

public Observable<Permission> requestEach(final String... permissions) {
    return Observable.just(TRIGGER).compose(ensureEach(permissions));
}

requestEach The method is to receive a String Variable length array of type , We define a permissions The array can be passed in by adding an asterisk

And such as

var temp = arrayOf("1" , "2" , "3")
getItem(*temp)

fun getItem(vararg str:String){
    str.forEach {
        ToastUtils.showLong(it)
    }
}

vararg Variable length parameter .