danielocampo2

fun <T, K> Iterable<T>.multiDistinctBy(vararg selectors: (T) -> K): List<T> {
    require(selectors.isNotEmpty())
    val set = HashSet<Int>()
    val distinct = ArrayList<T>()

    for (element in this) {
        val key = selectors.fold(0) { sum, selector ->
            sum.plus(selector(element)?.hashCode() ?: 0) }

        if (set.add(key))

danielocampo2

fun View.visible() {
    visibility = View.VISIBLE
}

fun View.invisible() {
    visibility = View.INVISIBLE
}

fun View.gone() {
    visibility = View.GONE