Operator Overloading in Kotlin

OperatorOverloading.kt

fun main() {
    val state = State.DataLoaded
    val newState = state + UserInputs.OnRetryClick
    println(newState)
}

sealed class State{
    abstract operator fun plus(userInputs: UserInputs): State

    object DataLoaded : State() {
        override fun plus(userInputs: UserInputs): State {
            return when (userInputs) {
                UserInputs.OnRetryClick -> {
                   LoadingNewData
                }
            }
        }
    }
    object LoadingNewData: State(){
        override fun plus(userInputs: UserInputs): State {
            TODO("Not yet implemented")
        }

    }
}

sealed class UserInputs{
    object OnRetryClick: UserInputs()
}