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title: indexOf
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# indexOf

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

## indexOf<T>(array: Array<T>, toFind: T): Number

Returns the index of the first occurrence of an element within the array. If the value is not found,
the function returns `-1`.

_Introduced in DataWeave version 2.2.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>array</code></p></td><td><p>The array of elements.</p></td></tr><tr><td><p><code>toFind</code></p></td><td><p>The element to find.</p></td></tr></tbody></table>

### Example

This example returns the index of the matching value from the input array. The index of `"Julian"`
is `2`.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Arrays
output application/json
var users = ["Mariano", "Leandro", "Julian"]
---
indexOf(users, "Julian")
```

#### Output

```json
2
```