code: public Double score(final String member) {
          return doWithJedis(new JedisCallable<Double>() {
              @Override
              public Double call(Jedis jedis) {
                  return jedis.zscore(getKey(), member);
              }
          });
      }
docs: Return the score of the specified element of the sorted set at key.
  @param member
  @return The score value or <code>null</code> if the element does not exist in the set.