Returns an iterator walking through files.

fun iterator(): Iterator<File>

Sets the maximum depth of a directory tree to traverse. By default there is no limit.

fun maxDepth(depth: Int): FileTreeWalk

Sets a predicate function, that is called on any entered directory before its files are visited and before it is visited itself.

fun onEnter(function: (File) -> Boolean): FileTreeWalk

Set a callback function, that is called on a directory when it's impossible to get its file list.

fun onFail(
    function: (File, IOException) -> Unit
): FileTreeWalk

Sets a callback function, that is called on any left directory after its files are visited and after it is visited itself.

fun onLeave(function: (File) -> Unit): FileTreeWalk

Returns a sequence containing all elements that are instances of specified class.

fun <R> Sequence<*>.filterIsInstance(
    klass: Class<R>
): Sequence<R>

Appends all elements that are instances of specified class to the given destination.

fun <C : MutableCollection<in R>, R> Sequence<*>.filterIsInstanceTo(
    destination: C, 
    klass: Class<R>
): C

Returns the sum of all values produced by selector function applied to each element in the sequence.

fun <T> Sequence<T>.sumOf(
    selector: (T) -> BigDecimal
): BigDecimal

fun <T> Sequence<T>.sumOf(
    selector: (T) -> BigInteger
): BigInteger

Returns a new SortedSet of all elements.

fun <T> Sequence<T>.toSortedSet(
    comparator: Comparator<in T>
): SortedSet<T>