---
title: length() function
description: >
  `length()` returns the number of elements in an array.
menu:
  flux_0_x_ref:
    name: length
    parent: universe
    identifier: universe/length
weight: 101

introduced: 0.7.0
---

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`length()` returns the number of elements in an array.



##### Function type signature

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

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

## Parameters

### arr

Array to evaluate. Default is the piped-forward array (`<-`).




## Examples

### Return the length of an array

```js
people = ["John", "Jane", "Abed"]

people |> length()// Returns 3


```