# Watch Boolean Expression

### ![State_Expression_Boolean.png](https://simlab-soft.com/help/uploads/images/gallery/2024-08/state-expression-boolean.png) Watch Boolean Expression

![Ceiling Node.png](https://simlab-soft.com/help/uploads/images/gallery/2024-08/scaled-1680-/5dMimage.png)

The **Watch Boolean Expression** node enables the user to check the value of specific variable(s) with **OnTrue/OnFalse** ports to execute responses or **Output Boolean** port that is compatible with event nodes.

#### Examples

![image.png](https://simlab-soft.com/help/uploads/images/gallery/2024-08/scaled-1680-/Of8image.png)

In this example, a **Watch Boolean Expression** node is used to check the value of **a string variable** to determine if it is true or false, depending on the result, the object named Activate can be triggered. Once the event is triggered, the object named Table will be shown during the VR Experience.


![image.png](https://simlab-soft.com/help/uploads/images/gallery/2024-08/scaled-1680-/1PWimage.png)

In this example, a **Watch Boolean Expression** node is used to check the value of **a number variable** to determine if it is true or false, depending on the result, the object named Activate can be triggered. Once the event is triggered, the object named Table will be shown during the VR Experience.


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