LINDEX · Valkey

LINDEX

Returns an element from a list by its index.

Usage

LINDEX key index

Description

Returns the element at index index in the list stored at key. The index is zero-based, so 0 means the first element, 1 the second element and so on. Negative indices can be used to designate elements starting at the tail of the list. Here, -1 means the last element, -2 means the penultimate and so forth.

When the value at key is not a list, an error is returned.

Reply RESP2

One of the following:

Reply RESP3

One of the following:

Complexity

O(N) where N is the number of elements to traverse to get to the element at index. This makes asking for the first or the last element of the list O(1).

ACL Categories

@list @read @slow

Examples

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> LINDEX mylist 0
"Hello"
127.0.0.1:6379> LINDEX mylist -1
"World"
127.0.0.1:6379> LINDEX mylist 3
(nil)

History

See also

BLMOVE, BLMPOP, BLPOP, BRPOP, LINSERT, LLEN, LMOVE, LMPOP, LPOP, LPOS, LPUSH, LPUSHX, LRANGE, LREM, LSET, LTRIM, RPOP, RPUSH, RPUSHX.