Prepends one or more elements to a list. Creates the key if it doesn’t exist.
LPUSH
key element
[element…]
Insert all the specified values at the head of the list stored at
key
. If key
does not exist, it is created as
empty list before performing the push operations. When key
holds a value that is not a list, an error is returned.
It is possible to push multiple elements using a single command call
just specifying multiple arguments at the end of the command. Elements
are inserted one after the other to the head of the list, from the
leftmost element to the rightmost element. So for instance the command
LPUSH mylist a b c
will result into a list containing
c
as first element, b
as second element and
a
as third element.
Integer reply: the length of the list after the push operation.
O(1) for each element added, so O(N) to add N elements when the command is called with multiple arguments.
@fast @list @write
127.0.0.1:6379> LPUSH mylist "world"
(integer) 1
127.0.0.1:6379> LPUSH mylist "hello"
(integer) 2
127.0.0.1:6379> LRANGE mylist 0 -1
1) "hello"
2) "world"
element
arguments.BLMOVE, BLMPOP, BLPOP, BRPOP, LINDEX, LINSERT, LLEN, LMOVE, LMPOP, LPOP, LPOS, LPUSHX, LRANGE, LREM, LSET, LTRIM, RPOP, RPUSH, RPUSHX.