sadd

SADD

SADD key member [member ...]

Available since 1.0.0.

Time complexity: O(1) for each element added, so O(N) to add N elements when the command is called with multiple arguments.

Add the specified members to the set stored at key. Specified members that are already a member of this set are ignored. If key does not exist, a new set is created before adding the specified members.

An error is returned when the value stored at key is not a set.

Return value

Integer reply: the number of elements that were added to the set, not including all the elements already present into the set.

History

>= 2.4: Accepts multiple member arguments. Redis versions before 2.4 a
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