> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/cortex-xdr-3.x/cortex-xdr-3.x-documentation/cortex-xdr-xql/functions/arrayindexof.md).

# arrayindexof

**Syntax**

```programlisting
arrayindexof(<array>, <condition>)
```

```programlisting
arrayindexof(<array>, "@element"<operator>"<array element>")
```

{% hint style="info" %}

### Note

The `<operator>` can be any of the ones supported, such as `=` and `!=`.
{% endhint %}

**Description**

The `arrayindexof()` function enables you to return a value related to an array in one of the following ways.

* Returns 0 if a particular array is not empty and the specified condition is true. If the condition is not met, a NULL value is returned.
* Returns the 0-based index of a particular array element if a particular array is not empty and the specified condition using an `@element` is true. If the condition is not met, a NULL value is returned.

**Examples**

**Condition**

Use the [alter](/cortex-xdr-3.x/cortex-xdr-3.x-documentation/cortex-xdr-xql/stages/alter.md) stage to assign a value returned by the `arrayindexof` function to a field called `x`. The `arrayindexof` function reviews the `dfe_labels` array and returns 0 if the array is not empty and the `backtrace_identities` array contains more than 1 element. Otherwise, a NULL value is assigned to the `x` field.

```programlisting
dataset in (xdr_data) 
| alter x = arrayindexof(dfe_labels , array_length(backtrace_identities) > 1) 
| fields x, dfe_labels 
| limit 100 
```

**@Element**

When the `dfe_labels` array is not empty, use the [alter](/cortex-xdr-3.x/cortex-xdr-3.x-documentation/cortex-xdr-xql/stages/alter.md) stage to assign the 0-based index value returned by the `arrayindexof` function to a field called `x`. The `arrayindexof` function reviews the `dfe_labels` array and looks for the array element set to `network`. Otherwise, a NULL value is assigned to the `x` field.

```programlisting
dataset = xdr_data 
| filter dfe_labels != null
| alter x = arrayindexof(dfe_labels , "@element" = "network") 
| fields x, dfe_labels 
| limit 100 
```


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