Commandslrem
LREM
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Redis Regular Inspection / Technical Support
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Redis Enterprise Server
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Remove by value
Usage is lrem key count value.
If count is positive, the specified value is removed from the left of the list up to count times.
If count is 0, all matching values are removed. Returns the number of removed values.
Example
| Command> | lpush mylist value2 value2 value2 value1 |
| Result> | 4 |
| Command> | lrange mylist 0 -1 |
| Result> | 0) value1 1) value2 2) value2 3) value2 |
| Command> | lrem mylist 1 value2 |
| Result> | 1 |
| Command> | lrange mylist 0 -1 |
| Result> | 0) value1 1) value2 2) value2 |
| Command> | lrem mylist 0 value2 |
| Result> | 2 Returns the number of removed values |
| Command> | lrange mylist 0 -1 |
| Result> | 0) value1 |
Use a negative count to remove from the right
If count is negative, values are removed from the right up to |count| times.
Example
| Command> | lpush mylist value2 value2 value2 value1 |
| Result> | 4 |
| Command> | lrem mylist -2 value2 |
| Result> | 2 |
| Command> | lrange mylist 0 -1 |
| Result> | 0) value1 1) value2 |
Remove by index
You can specify an index to remove a value.
Indexes start at 0. The last index can be -1 or the result of LLEN.
A reverse index can be used.
When you know the index, it is faster than using the value.
Example
| Command> | lrem mylist 1 by index |
| Result> | 2 |
| Command> | lrem mylist -1 by index |
| Result> | 1 |
| This feature is available on Enterprise servers. |
Syntax
LREM key [count value] | [<index> by index]
- Available since version 1.0.0.
- Time complexity is O(N). N is the number of elements.
- Returns the number of removed elements.
| Related commands | LTRIM, LINSERT, LSET, DEL |
| Clients for Java | Jedis, Lettuce, Redisson | Clients for C | Hiredis |
| << LINSERT | LREM | LRM >> |
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