---
title: "Nan Steps"
slug: "isnan-double"
updated: 2023-11-22T13:42:00Z
published: 2023-11-22T13:42:00Z
canonical: "documentation.decisions.com/isnan-double"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.decisions.com/llms.txt
> Use this file to discover all available pages before exploring further.

# IsNaN (Double)

| Step Details |
| --- |
| **Introduced in Version** | 8.17 |
| **Last Modified in Version** | -- |
| **Location** | Data > Text > Numbers |

NaN serves as a way to indicate that a numerical result is undefined or cannot be expressed as a real number.

The [IsNaN](https://learn.microsoft.com/en-us/dotnet/api/system.double.isnan?view=net-8.0) Rule step outputs a boolean value, indicating whether the given input is not a number. This step is used in conjunction with the [Create NaN](/step-library/docs/create-nan-double) step.

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## Properties

#### Inputs

| Property | Description | Data Type |
| --- | --- | --- |
| Value | Allows to pass a NaN value | Double |

![](https://cdn.document360.io/6ef8bcc1-6489-4486-9ad1-83acff7e5df0/Images/Documentation/image-1700659902135.png)

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Related Information:

[Create NaN](/step-library/docs/create-nan-double)