---
title: array.map() function
description: >
  `array.map()` iterates over an array, applies a function to each element to produce a new element,
  and then returns a new array.
menu:
  flux_v0_ref:
    name: array.map
    parent: array
    identifier: array/map
weight: 101

introduced: 0.173.0
---

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`array.map()` iterates over an array, applies a function to each element to produce a new element,
and then returns a new array.



##### Function type signature

```js
(<-arr: [A], fn: (x: A) => B) => [B]
```

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

## Parameters

### arr

Array to operate on. Defaults is the piped-forward array (`<-`).



### fn
({{< req >}})
Function to apply to elements. The element is represented by `x` in the function.




## Examples

### Convert an array of integers to an array of records

```js
import "array"

a = [
    1,
    2,
    3,
    4,
    5,
]
b = a |> array.map(fn: (x) => ({_value: x}))

// b returns [{_value: 1}, {_value: 2}, {_value: 3}, {_value: 4}, {_value: 5}]
// Output the array of records as a table
array.from(rows: b)

```

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{{% expand "View example output" %}}

#### Output data

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

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