Class ZRankCommand

Available since 2.0.0.

ZRANK key member

Returns the rank of member in the sorted set stored at key, with the scores ordered from low to high. The rank (or index) is 0-based, which means that the member with the lowest score has rank 0.

Use (not implemented ZRevRankCommand | ZREVRANK) to get the rank of an element with the scores ordered from high to low.

Return value

If member exists in the sorted set, Integer reply: the rank of member.

If member does not exist in the sorted set or key does not exist, Bulk string reply: nil.

Examples

redis> ZADD myzset 1 "one"
(integer) 1
redis> ZADD myzset 2 "two"
(integer) 1
redis> ZADD myzset 3 "three"
(integer) 1
redis> ZRANK myzset "three"
(integer) 2
redis> ZRANK myzset "four"
(nil)
redis>
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