# ARMSET

> Set values at several array indexes.

Use `ARMSET` to write several index-value pairs into an array in one atomic call.

Unlike [`ARSET`](/redis/commands/array/arset), which fills a contiguous run from a starting index, `ARMSET` takes an explicit index for every value, so scattered slots can be updated together without a round trip each. The reply counts the slots that were newly occupied; pairs that overwrote an existing value contribute nothing to it.

If the same index appears more than once in one call, the last value given for it wins.

See the [array command overview](/redis/commands/array/overview) for the data model these commands share.

## Syntax

```redis
ARMSET <key> <index> <value> [<index> <value> ...]
```

## Arguments

| Argument | Required | Repeatable | Description |
| --- | --- | --- | --- |
| `<key>` | Yes | No | Array key targeted by the command. |
| `<index> <value>` | Yes | Yes | Index and the value to store in it. Repeat to write several slots in one call. |

## Important points

- The number of arguments after the key must be even; an odd count returns a wrong number of arguments error.
- The reply counts newly occupied slots only. Overwriting an existing value contributes `0`.

## Response

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.

| Protocol | Reply |
| --- | --- |
| RESP2 | Integer |
| RESP3 | Integer |

<Note>
  Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.
</Note>

## Examples

TCP examples use the TLS `REDIS_URL` from the Upstash console. REST examples use `UPSTASH_REDIS_REST_URL` and `UPSTASH_REDIS_REST_TOKEN`.

<AccordionGroup>

<Accordion title="Redis CLI" icon="terminal">

```bash
ARMSET my-array 0 hello 5 world
```

</Accordion>

<Accordion title="@upstash/redis" icon="node-js" iconType="brands">

<Note>
  This command is not supported yet in `@upstash/redis`.
</Note>

</Accordion>

<Accordion title="upstash_redis" icon="python" iconType="brands">

<Note>
  This command is not supported yet in `upstash_redis`.
</Note>

</Accordion>

<Accordion title="ioredis" icon="node-js" iconType="brands">

```ts
import Redis from "ioredis";

const redis = new Redis(process.env.REDIS_URL!);
const result = await redis.armset("my-array", 0, "hello", 5, "world");
console.log(result);
```

</Accordion>

<Accordion title="node-redis" icon="node-js" iconType="brands">

```ts
import { createClient } from "redis";

const client = await createClient({ url: process.env.REDIS_URL })
  .on("error", console.error)
  .connect();
const result = await client.arMSet("my-array", { 0: "hello", 5: "world" });
console.log(result);
```

</Accordion>

<Accordion title="redis-py" icon="python" iconType="brands">

```python
import os
import redis

client = redis.from_url(os.environ["REDIS_URL"])
result = client.armset("my-array", {0: "hello", 5: "world"})
print(result)
```

</Accordion>

<Accordion title="go-redis" icon="golang" iconType="brands">

```go
package main

import (
    "context"
    "fmt"
    "os"

    "github.com/redis/go-redis/v9"
)

func main() {
    opts, err := redis.ParseURL(os.Getenv("REDIS_URL"))
    if err != nil {
        panic(err)
    }
    client := redis.NewClient(opts)
    result, err := client.ARMSet(context.Background(), "my-array", redis.AREntry{Index: 0, Value: "hello"}, redis.AREntry{Index: 5, Value: "world"}).Result()
    if err != nil {
        panic(err)
    }
    fmt.Println(result)
}
```

</Accordion>

<Accordion title="jedis" icon="java" iconType="brands">

```java
import java.net.URI;
import java.util.Map;

import redis.clients.jedis.Jedis;

try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {
  Object result = jedis.armset("my-array", Map.of(0L, "hello", 5L, "world"));
  System.out.println(result);
}
```

</Accordion>

<Accordion title="redis-rs" icon="rust" iconType="brands">

```rust
fn main() -> redis::RedisResult<()> {
    let url = std::env::var("REDIS_URL").expect("REDIS_URL is not set");
    let client = redis::Client::open(url)?;
    let mut connection = client.get_connection()?;

    let mut command = redis::cmd("ARMSET");
    command.arg("my-array");
    command.arg("0");
    command.arg("hello");
    command.arg("5");
    command.arg("world");
    let result: redis::Value = command.query(&mut connection)?;
    println!("{result:?}");
    Ok(())
}
```

</Accordion>

</AccordionGroup>