Skip to main content

SCARD

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

Syntax​

SCARD key

Details​

  • Available since: 1.0.0
  • Time complexity: O(1)
  • ACL categories: @read, @set, @fast

Example​

Assume we have a set called myset with members "member1", "member2", and "member3":

SADD myset "member1" "member2" "member3"

Now, let's retrieve the cardinality of myset:

SCARD myset

This will output:

(integer) 3

RESP2/RESP3 Reply​

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