# Custom Functions

## 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**

<figure><img src="/files/ypkDpj82XBBgvtCft7tP" alt=""><figcaption><p>Example of a custom function that add two numbers and return the result as a string</p></figcaption></figure>

## Use a Custom Function

<figure><img src="/files/qccRaX8qSyQmIAH3I3tR" alt=""><figcaption><p>Example of use of a custom function that increment by 1 an observable on button click</p></figcaption></figure>


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