# IsNullOrWhitespace (StringValue) | **Name** | ***IsNullOrWhitespace (String)*** | | ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Syntax | IsNullOrWhitespace (String val) | | Purpose | To determine whether a string is null, if its length is zero, or if it contains only white space characters. | | Description |

Returns true if the specified string contains null value, if string length is zero, or if a string contains only white space characters.

Note: White space characters are space, tab, return, and linefeed.

| | Return Type | Boolean | | Parameters | val \[System.String] – Expression that will be evaluated | **Example**
In this example, we will pass a whitespace value to the function transformation object using a *Variables* object. ![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/1%20\(15\).png) ![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/2%20\(15\).png) In the output, you can see that the Boolean value, True, has been returned as the passed value consisted of whitespaces. If the same variable was passed through the *IsNullOrEmpty* function, The output would be false.