Gabriel Rajadurai thank you for your response.

We can return a function from a higher order function. Please check the below syntax.

fun outerFunction(): () -> Unit {
    var iAmAVariable = 10
    return fun() {
        print("I am inside the returning function")
    }
}

we can also return an object from the returning function.

fun outerFunction(): () -> Int {
    var iAmAVariable = 10
    return fun() : Int {
        iAmAVariable += 10
        return iAmAVariable
    }
}

Or we can even call some other function from a returning function also.

fun outerFunction(): () -> Unit {
    var iAmAVariable = 10
    return fun() {
        someOtherFunction()
    }
}
fun someOtherFunction() {
    print("I am another function")
}

Hope this helps. :)