Commandslpushx
LPUSHX
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Redis Regular Inspection / Technical Support
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Redis Enterprise Server
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Push data to the left of the list only if the key already exists
Usage is lpushx key value.
Example
| Command> | lpush mylist Hello |
| Result> | 1 |
| Command> | lpushx mylist Redis |
| Result> | 2 |
| Command> | lpushx mylist2 World Cannot insert into a key that does not exist. Returns 0. |
| Result> | 0 |
| Command> | exists mylist2 |
| Result> | 0 |
Syntax
LPUSHX key value
- Available since version 2.2.0.
- Time complexity is O(1).
| Related commands | RPUSHX, LPUSH, RPUSH |
| Clients for Java | Jedis, Lettuce, Redisson | Clients for C | Hiredis |
| << RPOPLPUSH | LPUSHX | RPUSHX >> |
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