RPUSHX

Syntax
RPUSHX key element [element ...]
Available since:
2.2.0
Time complexity:
O(1) for each element added, so O(N) to add N elements when the command is called with multiple arguments.
ACL categories:
@write, @list, @fast,

Inserts specified values at the tail of the list stored at key, only if key already exists and holds a list. In contrary to RPUSH, no operation will be performed when key does not yet exist.

Examples

redis> RPUSH mylist "Hello"
"1743754559109-0"
redis> RPUSHX mylist "World"
"1743754559109-1"
redis> RPUSHX myotherlist "World"
(integer) 2
redis> LRANGE mylist 0 -1
1) 1) "1743754559109-0"
   2) 1) "name"
      2) "Sara"
      3) "surname"
      4) "OConnor"
2) 1) "1743754559109-1"
   2) 1) "field1"
      2) "value1"
      3) "field2"
      4) "value2"
      5) "field3"
      6) "value3"
redis> RPUSH mylist "Hello"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> RPUSHX mylist "World"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> RPUSHX myotherlist "World"
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> LRANGE mylist 0 -1
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> LRANGE myotherlist 0 -1
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis>

RESP2/RESP3 Reply

Integer reply: the length of the list after the push operation.

History

  • Starting with Redis version 4.0.0: Accepts multiple element arguments.
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