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---
---
product: DataWeave
version: 2.3
---

# index

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## index(Number): PathElement

This function creates a `PathElement` data type to use for selecting an _array element_ and
populates the type’s `selector` field with the specified index.

Some versions of the `update` and `mask` functions accept a `PathElement` as an argument.

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>index</code></p></td><td><p>The index.</p></td></tr></tbody></table>

### Example

This example creates an selector for a specified index. It sets the selector’s value to `0`. In the
output, also note that the value of the `"kind"` key is `"Array"`.

#### Source

```DataWeave
 %dw 2.0
 output application/json
 import * from dw::util::Values
 ns ns0 http://acme.com/foo
 ---
 index(0)
```

#### Output

```Json
{
   "kind": "Array",
   "namespace": null,
   "selector": 0
 }
```