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

static <A, B> L<A> sortedBy(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;
}

Began life as a copy of #1017753