Redis SET Data type

redis-set.rb

127.0.0.1:6379> SADD set-key item # Initializes a SET with key set-key. adds item and returns 1 as success
(integer) 1
127.0.0.1:6379> SADD set-key item # item already exists, thus returns 0 as failure
(integer) 0
127.0.0.1:6379> SADD set-key item1 # add item1 to the set with key set-key 
(integer) 1
127.0.0.1:6379> SADD set-key item2 # add item2 to the set with key set-key 
(integer) 1
127.0.0.1:6379> SMEMBERS set-key # Fetches all items in the set with key set-key 
1) "item1"
2) "item2"
3) "item"
127.0.0.1:6379> SISMEMBER set-key item # Checks if item is available in the set with key set-key. Returns 1 as success
(integer) 1
127.0.0.1:6379> SISMEMBER set-key item100 # Checks if item100 is available in the set with key set-key. Returns 0 as failure
(integer) 0