---
title: array.concat() function
description: array.concat() appends two arrays and returns a new array.
url: https://docs.influxdata.com/flux/v0/stdlib/experimental/array/concat/
estimated_tokens: 344
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/experimental/array/concat/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.155.0 – 0.173.0

InfluxDB support

> [!Important]
> `array.concat()` is experimental and [subject to change at any time](/flux/v0/stdlib/experimental/#experimental-packages-are-subject-to-change).

`array.concat()` appends two arrays and returns a new array.

#### Deprecated

Experimental `array.concat()` is deprecated in favor of[`array.concat()`](/flux/v0/stdlib/array/concat).

Neither input array is mutated and a new array is returned.

##### Function type signature

```js
(<-arr: [A], v: [A]) => [A]
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### arr

First array. Default is the piped-forward array (`<-`).

### v

(Required)
Array to append to the first array.

## Examples

### Merge two arrays

```js
import "experimental/array"

a = [1, 2, 3]
b = [4, 5, 6]

c = a |> array.concat(v: b)

// Returns [1, 2, 3, 4, 5, 6]
// Output each value in the array as a row in a table
array.from(rows: c |> array.map(fn: (x) => ({_value: x})))
```

[](#view-example-output)

View example output

#### Output data

|\_value|
|-------|
|   1   |
|   2   |
|   3   |
|   4   |
|   5   |
|   6   |

#### Related

* [Work with arrays](/flux/v0/data-types/composite/array/)

[array](/flux/v0/tags/array/)[tables](/flux/v0/tags/tables/)
| _value |
| --- |
| _value |
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |