static L map_ping(Iterable l, O f) { ret map_ping(f, l); }

static L map_ping(O f, Iterable l) {

  L x = emptyList(l);

  if (l != null) for (O o : l)

    x.add(callF(f, o));

  ret x;

}

ifclass F1

  static <A, B> L<B> map_ping(Iterable<A> l, F1<A, B> f) { ret map_ping(f, l); }

  static <A, B> L<B> map_ping(F1<A, B> f, Iterable<A> l) {

    L x = emptyList(l);

    if (l != null) for (A o : l)

      x.add(callF(f, o));

    ret x;

  }

endif

static <A, B> L<B> map_ping(IF1<A, B> f, Iterable<A> l) { ret map_ping(l, f); }

static <A, B> L<B> map_ping(Iterable<A> l, IF1<A, B> f) {

  L x = emptyList(l);

  if (l != null) for ping (A o : l)

    x.add(f.get(o));

  ret x;

}

static <A, B> L<B> map_ping(IF1<A, B> f, A[] l) { ret map_ping(l, f); }

static <A, B> L<B> map_ping(A[] l, IF1<A, B> f) {

  L x = emptyList(l);

  if (l != null) for ping (A o : l)

    x.add(f.get(o));

  ret x;

}

static L map_ping(O f, O[] l) { ret map_ping(f, asList(l)); }

static L map_ping(O[] l, O f) { ret map_ping(f, l); }

static L map_ping(O f, Map map) {

  ret map_ping(map, f);

}

// map_ping: func(key, value) -> list element

static L map_ping(Map map, O f) {

  new L x;

  if (map != null) for ping (O _e : map.entrySet()) {

    Map.Entry e = (Map.Entry) _e;

    x.add(callF(f, e.getKey(), e.getValue()));

  }

  ret x;

}

static <A, B, C> L<C> map_ping(Map<A, B> map, IF2<A, B, C> f) {

  ret map_ping(map, (O) f);

}