kotlin findLastIndex() extension function

Collections.kt

// https://github.com/JetBrains/kotlin/blob/master/libraries/stdlib/src/kotlin/collections/Collections.kt

/**
 * Returns the index of the last item in the list that match predicate
 * @param predicate function returning boolean for matching element.
 *
 * @return the index of the last element found
 * otherwise returns -1
 */
public inline fun <T> List<T>.findLastIndex(predicate: (T) -> Boolean): Int {
    val iterator = this.listIterator(size)
    var count = 1
    while (iterator.hasPrevious()) {
        val element = iterator.previous()
        if (predicate(element)) return size - count
        count++
    }
    return -1
}