SCARD

SCARD is a Redis command used to get the number of members in a set, it returns the cardinality of the specified set, which is the total count of unique elements it contains. If the set does not exist, SCARD returns 0. This command is useful for quickly determining the size of a set, allowing applications to make decisions based on the number of unique items, such as checking user participation in a campaign or the count of unique tags in a system.

Learn more from the following resources:

• @official@SCARD