> For the complete documentation index, see [llms.txt](https://docs.goril.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.goril.app/main-pages/custom-code/custom-functions.md). # Custom Functions Create a custom function reusable throughout the application. ## Creating a Custom Function In order to create a **Custom Function** follow the next steps : * Click on the **Add** button and select **Functions** in the opened list * Set the **Name** of your function on the right properties panel * Add a **Tag** to group your custom functions * Choose if your function should be **Async** or not * Add any **Parameters** you need * Choose the **Return Type** * Write your code in the central editor * Save by clicking on the top right button **Save**

Example of a custom function that add two numbers and return the result as a string

## Use a Custom Function

Example of use of a custom function that increment by 1 an observable on button click