# IsNull

### **Description**‌

The IsNull function replaces empty input values with the specified replacement value. If the input value is not empty will the value not be replaced.

### **Syntax**

‌The syntax for the IsNull function is:

`IsNull(input, replacement)`

#### ‌**Parameters**

input - the string which, if it is empty, will be replaced. 

replacement - the value which will replace an empty input.

### **Returns**

‌The IsNull function returns a string. 

### **Example**‌

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

```
IsNull("", 0)
Result: 0
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.novacuraflow.com/development/flowscript/functions/text-functions/isnull.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.