code: @Override
      public Object getMember(String name) {
          switch (name) {
              case "dense":
                  return F_dense;
              case "sparse":
                  return F_sparse;
              case "zeros":
                  return F_zeros;
              case "parse":
                  return F_parse;
              case "fromJson":
                  return F_fromJson;
              case "norm":
                  return F_norm;
              case "sqdist":
                  return F_sqdist;
          }
          return super.getMember(name);
      }
docs: get the value of that named property