Questions[kotlin]

I have inside my mainActivty, a menu to which I set a Switch in this way

activity_main_drawer.xml

<item
                    android:icon="@drawable/ic_light"
                    app:actionLayout="@layout/menu_switch"
                    android:title="Modo"
                    />

And inside the menu_switch.xml

<Switch xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/nav_switch"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:clickable="true"
    android:focusable="true"
    />

How could I access the state of the switch (nav_switch) from the activityMain?, to grant actions in case the switch was checked or not. Thank you

I am doing a simple "hello World" it executes me without errors but it does not show anything on the screen I am using IntelliJ

fun main() {
    println("Hello world")
}

I'm taking a course on Kotlin coroutines and I've had a few questions about the scope. First of all, I understand that it GlobalScopeis linked to the life cycle, if the activity (for example) dies before the coroutine finishes, it throws an exception, correct me if I'm wrong.

I have also come across two ways to implement CoroutineScope, one would be to directly implement the interface and call get passing it the Dispatcher and the job, and the other that I have seen is creating an instance of it, what difference is there?

Finally, the other question I have is the method MainScopethat I have seen it used in some cases MainScope().launch, and from what I have seen it already provides you with one CoroutineScope, but when do I use one or the other? What is better?

Is there a way to evaluate a String in Kotlin like JavaScript's eval()?

For example:

var str = "var x = 5"
eval(str)

println(x) //Y que muestre por pantalla 5

For example, filling a crash array with data from another array:

if (datosAccidente.desperfectos.isNotEmpty()) {
  rDesperfectos = datosAccidente.desperfectos.map { Desperfecto(it) }
}

or when reading lines from a file:

File("./miFichero.txt").forEachLine { println(it) }

What is it itand what would it represent in those examples?

Reading the documentation , it is mentioned that it itis an implicit name for a single parameter, but then why wouldn't it work for a case like the following:

fun test(datos: String) {
  var aux: String = it
}