// f: A -> Comparable
static <A> L<A> sortedByCalculatedField(Iterable<A> c, O f) {
  ret sortByCalculatedField(c, f);
}

static <A> L<A> sortedByCalculatedField(O f, Iterable<A> c) {
  ret sortedByCalculatedField(c, f);
}

static <A, B> L<A> lambdaMapLike sortedByCalculatedField(IF1<A, B> f, Iterable<A> c) {
  ret sortedByCalculatedField(c, f);
}

static <A, B> L<A> sortedByCalculatedField(Iterable<A> c, IF1<A, B> f) {
  L<A> l = cloneList(c);
  sort(l, new Comparator<A>() {
    public int compare(A a, A b) {
      ret stdcompare(f.get(a), f.get(b));
    }
  });
  ret l;
}