# Data Types \ String \ Expression

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### ![Response_Expression_String.png](https://simlab-soft.com/help/uploads/images/gallery/2024-09/response-expression-string.png) Evaluate String Expression

![Ceiling Node.png](https://simlab-soft.com/help/uploads/images/gallery/2024-09/scaled-1680-/ncjimage.png)The **Evaluate String Expression** response enables the system to implement an expression in Lua language. Supported expressions can be found at this **[link](https://devdocs.io/lua~5.4/)**. Once the response is executed, the expression result can be acquired through the Result port.

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#### Example

In this example, an **Evaluate String Expression** response enables the system to execute a Lua expression. Once the response is executed, the result of the expression can be retrieved through the **Result** port and can be displayed using a variable writer during the VR Experience.

![image.png](https://simlab-soft.com/help/uploads/images/gallery/2024-09/scaled-1680-/rykimage.png)


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