Esempio n. 1
1
 @Override
 public Vector<Object> flatten() {
   return flatMap(
       t ->
           (t instanceof java.lang.Iterable)
               ? Vector.ofAll((java.lang.Iterable<?>) t).flatten()
               : Vector.of(t));
 }
Esempio n. 2
1
 Vector<Vector<T>> combinations(Vector<T> elements, int k) {
   return (k == 0)
       ? Vector.of(Vector.empty())
       : elements
           .zipWithIndex()
           .flatMap(
               t ->
                   combinations(elements.drop(t._2 + 1), (k - 1))
                       .map((Vector<T> c) -> c.prepend(t._1)));
 }
Esempio n. 3
1
 @Override
 public Vector<Vector<T>> permutations() {
   if (isEmpty()) {
     return Vector.empty();
   } else {
     final Vector<T> tail = tail();
     if (tail.isEmpty()) {
       return Vector.of(this);
     } else {
       final Vector<Vector<T>> zero = empty();
       // TODO: IntelliJ IDEA 14.1.1 needs a redundant cast here, jdk 1.8.0_40 compiles fine
       return distinct()
           .foldLeft(
               zero,
               (xs, x) ->
                   xs.appendAll(
                       remove(x)
                           .permutations()
                           .map((Function<Vector<T>, Vector<T>>) l -> l.prepend(x))));
     }
   }
 }