# Combine(params ComponentType[][])

> Combine multiple array of component type into one. Duplicate types are removed. It will allocate an array containing all component type. Useful for creating queries during initialization of systems.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

## Combine(ComponentType\[]\[])

```csharp
[ExcludeFromBurstCompatTesting("Takes a managed array")]
public static ComponentType[] Combine(params ComponentType[][] componentTypes)
```

### Parameters

**** (\[ComponentType\[]\[]]\(/engine/7000.0/script-reference/unity/entities/componenttype)): 

### Returns

| Type                                                                                 | Description |
| ------------------------------------------------------------------------------------ | ----------- |
| [ComponentType\[\]](/engine/7000.0/script-reference/unity/entities/componenttype.md) |             |