SADD

Adds one or more members to a set. Creates the key if it doesn't exist.

Usage: SADD key member ...
Complexity: O(1) for each element added, so O(N) to add N elements when the command is called with multiple arguments.
Since: 1.0.0
ACL Categories: @fast, @set, @write
Command flags: WRITE, DENYOOM, FAST

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.

Examples

127.0.0.1:6379> SADD myset "Hello"
(integer) 1
127.0.0.1:6379> SADD myset "World"
(integer) 1
127.0.0.1:6379> SADD myset "World"
(integer) 0
127.0.0.1:6379> SMEMBERS myset
1) "Hello"
2) "World"

Replies

RESP2

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

RESP3