def test() = {
    val itemCount = 1000
    val filterText = Var("")
    val items = Var( (0 until itemCount).map(idx => (idx, s"Item ${idx}")))
    val filteredItems = items.signal.combineWith(filterText.signal).map{
        case (its, "") => its
        case (its, x) => its.filter(_._2.contains(x)).toList
    }

    div(
        div(
            input(
                `type`("text"),
                value <-- filterText,
                onInput.mapToValue --> filterText
            )
        ),
        div(
            children <-- filteredItems.split(_._1)( (idx, initial, fstream) => {
                div(s"I am item: ${initial._2}")
            })
        )
    )
}