LPUSHX key value

Syntax

LPUSHX key value

     Insert value into the list only if list exists.

Returns

Length of the list after push operation.

127.0.0.1:6379> keys * 
1) "hello" 
2) "var1" 
3) "welcome" 
127.0.0.1:6379> 
127.0.0.1:6379> lpushx ids 1 
(integer) 0 
127.0.0.1:6379> 
127.0.0.1:6379> keys * 
1) "hello" 
2) "var1" 
3) "welcome" 
127.0.0.1:6379> 
127.0.0.1:6379> lpush ids 1 2 3 
(integer) 3 
127.0.0.1:6379> 
127.0.0.1:6379> keys * 
1) "hello" 
2) "ids" 
3) "var1" 
4) "welcome" 
127.0.0.1:6379> lpushx ids 1 
(integer) 4 
127.0.0.1:6379> lrange ids 0 3 
1) "1" 
2) "3" 
3) "2" 
4) "1" 

 

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