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"
(integer) 2
redis> RPUSHX mylist "World"
1) 1) "Palermo"
   2) "190.4424"
2) 1) "Catania"
   2) "56.4413"
redis> RPUSHX myotherlist "World"
1) 1) "Palermo"
   2) 1) "13.36138933897018433"
      2) "38.11555639549629859"
2) 1) "Catania"
   2) 1) "15.08726745843887329"
      2) "37.50266842333162032"
redis> LRANGE mylist 0 -1
1) 1) "Palermo"
   2) "190.4424"
   3) 1) "13.36138933897018433"
      2) "38.11555639549629859"
2) 1) "Catania"
   2) "56.4413"
   3) 1) "15.08726745843887329"
      2) "37.50266842333162032"
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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