> For the complete documentation index, see [llms.txt](https://help.novacuraflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.novacuraflow.com/development/flowscript/functions/number-functions/isnan.md).

# IsNaN

This Flow Script tutorial explains how to use the IsNaN function with syntax and examples.

### **Description**‌

The IsNaN function returns a value indicating whether 'x' is a "not a number" value (usually originating in a null value from a database).

### **Syntax**

‌The syntax for the IsNaN function is:

`IsNaN(x)`

‌**Parameters**

x - the value that is to be checked if it is a number or not.

### **Returns**

‌The IsNaN function returns True or False.

### **Example**‌

Let's look at some IsNaN function examples and explore how to use the IsNaN function.‌

```
IsNaN("hello")
Result: True

IsNaN(55)
Result: False
```


---

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