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	Command reference

ARNEXT

Array is a new data type that is currently in preview and may be subject to change.

Syntax text Syntax diagram API methods

ARNEXT key

Client:

arnext(
    name: KeyT
) → int | None

arNext(
    key: RedisArgument
) → NumberReply | NullReply

arnext(
    key: K  // the key of the array.
) → Long  // the next insert index, or 0 if the key does not exist, or null if the cursor is exhausted.

arnext(
    key: K  // the key of the array.
) → RedisFuture<Long>  // the next insert index, or 0 if the key does not exist, or null if the cursor is exhausted.

arnext(
    key: K  // the key of the array.
) → Mono<Long>  // the next insert index, or 0 if the key does not exist, or null if the cursor is exhausted.

ARNext(
    ctx: context.Context,  // Context
    key: string
) → *UintCmd

arnext(
    $key: string
) → int|null

Available since:: Redis Open Source 8.8.0
Time complexity:: O(1)
ACL categories:: @read, @array, @fast,
Compatibility:: Redis Software and Redis Cloud compatibility

Returns the next index ARINSERT would use.

Required arguments

key

The name of the key that holds the array.

Examples

redis> ARINSERT myarray "a"
(integer) 0
redis> ARINSERT myarray "b"
(integer) 1
redis> ARNEXT myarray
(integer) 2

Redis Software and Redis Cloud compatibility

Redis Software	Redis Cloud	Notes
❌ Standard ❌ Active-Active	❌ Standard ❌ Active-Active

Return information

RESP2 RESP3

One of the following:

Integer reply: The next index ARINSERT would use. Returns 0 for missing keys or when no insert happened yet.
Nil reply: Null when the insertion cursor is exhausted (next insert would overflow).