RestaurantsViewModel.kt

class RestaurantsViewModel: ViewModel() {
    private val _restaurantsState by mutableStateOf(
        restaurants
    )
    val restaurantsState = _restaurantsState


    fun toggleIsFavourite(
        rid: Int,
    ) {
        var indexToSearch = -1
        _restaurantsState.filterIndexed { index, restaurant ->
            val found = restaurant.id == rid
            if (found) {
                indexToSearch = index
            }
            restaurant.id == rid
        }
        if (indexToSearch > -1){
            _restaurantsState[indexToSearch].isFavourite = !_restaurantsState[indexToSearch].isFavourite
        }
    }
}