.. efun:: mixed * map_objects(object *arr, string fun, mixed extra, ...)
  mixed * map_objects(string *arr, string fun, mixed extra, ...)

  Similar to :efun:`map`, but calls ``arr[n]->fun(extra,...)``. The returned value replaces the object/string in returned array. :arg:`arr` may contain a mixture of objects and object names as well.

  Any number of extra arguments is allowed, which are all passed. 0-entries in arr are ignored.

  .. seealso:: :efun:`map`, :efun:`filter`, :efun:`filter_objects`