# updateFunction

> A native engine system. To get a valid value for this, you must copy it from one of the PlayerLoopSystems returned by GetDefaultPlayerLoop.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.LowLevel](/engine/6000.7/script-reference/unityengine/lowlevel.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public nint updateFunction
```