LREM
Syntax
LREM key count element
- Available since:
- 1.0.0
- Time complexity:
- O(N+M) where N is the length of the list and M is the number of elements removed.
- ACL categories:
-
@write
,@list
,@slow
,
Removes the first count
occurrences of elements equal to element
from the list
stored at key
.
The count
argument influences the operation in the following ways:
count > 0
: Remove elements equal toelement
moving from head to tail.count < 0
: Remove elements equal toelement
moving from tail to head.count = 0
: Remove all elements equal toelement
.
For example, LREM list -2 "hello"
will remove the last two occurrences of
"hello"
in the list stored at list
.
Note that non-existing keys are treated like empty lists, so when key
does not
exist, the command will always return 0
.