code: public static <K, V> void mapfx(Map<K, V> map, MapFunction<K, V> fx) {
          Set<Entry<K, V>> entries = entries(map);
          for (final Entry<K, V> entry : entries) {
              K key = entry.getKey();
              V value = entry.getValue();
              fx.apply(key, value);
          }
      }
docs: Applies the function {@code fx} to each of the
  {@link BELUtilities#entries(Map) entries} within the supplied map.
  
  @param map Non-null {@link Map}
  @param fx Non-null {@link MapFunction} to apply