LPUSH command in redis

LPUSH key string

Add the string value to the head (RPUSH) or tail (LPUSH) of the list stored at the key. If the key does not exist an empty list is created just before the append operation.

Note: If the key exists but is not a List an error is returned.

TIME COMPLEXITY: O(1)

RETURN VALUE: Status code reply

Syntax:

LPUSH KEY_NAME VALUE

Example 1: When the key is of List

redis:6379> LPUSH myredisList 1200
(integer) 1

Output

1

Example 2: When the key is not a list

redis:6379> SET rediKey 100
"OK"
redis:6379> LPUSH rediKey 200
(error) WRONGTYPE Operation against a key 
            holding the wrong kind of value

Output

(error) WRONGTYPE Operation against a key holding the wrong kind of value