ZSCORE command in redis

ZSCORE key member

Return the score of the specified element of the sorted set at the key.

Note: If the specified element does not exist in the sorted set, or the key does not exist at all, a special 'nil' value is returned.

TIME COMPLEXITY: O(1)

RETURN VALUE: Bulk reply, the score of member (a double precision floating point number), represented as a string.

Syntax:

ZSCORE key member

Example 1: When the key and member are present.

redis:6379> ZADD mykey 1 A 2 B 3 C 4 D 5 E
(integer) 5
redis:6379> ZSCORE mykey A
"1"

Output

1

Example 2: When the key or member is not present.

redis:6379> ZADD mykey 1 A 2 B 3 C 4 D 5 E
(integer) 5
redis:6379> ZSCORE mykey AA
(nil)
redis:6379> ZSCORE redisKey A
(nil)

Output

nil