kotlin - Kotlin中*操作的作用是什么？

Question

代码A来自官方样本project .

我不明白 valtasks = Remember { mutableStateListOf(*allTask​​s) } 是什么意思，你能告诉我吗？

顺便说一句，Android Studio给我一些信息，你可以看图片A

代码A

@Composable
fun Home() {
    // String resources.
    val allTasks = stringArrayResource(R.array.tasks)
    val allTopics = stringArrayResource(R.array.topics).toList()

    // The currently selected tab.
    var tabPage by remember { mutableStateOf(TabPage.Home) }

    // True if the whether data is currently loading.
    var weatherLoading by remember { mutableStateOf(false) }

    // Holds all the tasks currently shown on the task list.
    val tasks = remember { mutableStateListOf(*allTasks) }

    ...
}

图像A

Answer 1

来自the documentation of varargs :

When you call a vararg -function, you can pass arguments individually, for example asList(1, 2, 3). If you already have an array and want to pass its contents to the function, use the spread operator (prefix the array with *):

val a = arrayOf(1, 2, 3)
val list = asList(-1, 0, *a, 4)

如您所见，它将数组扩展为多个值以在可变参数中使用。如果您有一个包含元素 1, 2, 3 的数组，则可以将 *yourArray 传递给相当于 yourMethod(1,2,3 )。