Redis

SCARD key

Returns the set cardinality (number of elements) of the set stored at key.

Return value

Integer reply: the cardinality (number of elements) of the set, or 0 if key does not exist.

Examples

redis>  SADD myset "Hello"
(integer) 1
redis>  SADD myset "World"
(integer) 1
redis>  SCARD myset
(integer) 2
redis> 
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