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kotlinlang

i have list of TodoItem
```data class TodoItem(
    val taskName :String,
    val isCompleted : Boolean  = false,
)

 private val taskList = mutableListOf&lt;TodoItem&gt;()```
how can i change an element 'isCompleted' to true.
so if user said 4th element is completed how can i change it to complete
```taskList[index] = TodoItem(taskName = taskList[index].taskName, isCompleted = true)```
like this???

```taskList[index] = taskList[index].copy(isCompleted = true)```