question: @ Override public Double zincrby ( final byte [ ] key , final double score , final byte [ ] member ) { checkIsInMultiOrPipeline ( ) ; client . zincrby ( key , score , member ) ; String newscore = client . getBulkReply ( ) ; return Double . valueOf ( newscore ) ; }
target:  If member already exists in the sorted set adds the increment to its score and updates the position of the element in the sorted set accordingly. If member does not already exist in the sorted set it is added with increment as score (that is, like if the previous score was virtually zero). If key does not exist a new sorted set with the specified member as sole member is crated. If the key exists but does not hold a sorted set value an error is returned. <p> The score value can be the string representation of a double precision floating point number. It's possible to provide a negative value to perform a decrement. <p> For an introduction to sorted sets check the Introduction to Redis data types page. <p> Time complexity O(log(N)) with N being the number of elements in the sorted set