#Nulls unit

| **Note**                                                     |
| :----------------------------------------------------------- |
| For versions 2019/2020 LTS, download the visual scripting solution from the [Unity Asset Store](https://assetstore.unity.com/packages/tools/visual-bolt-163802). |

Null units deal with the null value, which is scripting lingo for "nothing".

###The null unit

The null unit always returns null as a value. Leaving a Unity object reference field empty ("None") automatically means null.


###Null Check

The null check is a shortcut for a branch on an equality comparison with null. It can be useful to direct the flow in different directions depending on whether a value is null.

For example, it can be used to handle a situation differently whether a transform has a parent in the hierarchy or not.

![](images/bolt-nulls1.png)

###Null Coalesce

The null coalesce unit provides a fallback value in case the original input is null.

For example, the null coalesce unit defines a default fallback audio clip in case the one on the audio source is missing.

![](images/bolts-nulls2.png)