> For the complete documentation index, see [llms.txt](https://kinematicsoup.gitbook.io/reactor/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kinematicsoup.gitbook.io/reactor/architecture/ksmultitype.md).

# ksMultiType

## Summary

`ksMultiType` is the value type Reactor uses to carry many common data types through one API. Properties and RPC arguments use it, which lets a single method or map hold different kinds of data. It is part of the [Reactor Technical Overview](/reactor/architecture.md).

## What It Holds

A `ksMultiType` can hold any of these, with implicit conversions to and from the matching C# type:

* **Primitives**: byte, short, ushort, int, uint, long, ulong, float, double, char, bool, string.
* **Math types**: Vector2, Vector3, Vector2Int, Vector3Int, Quaternion, Color.
* **Arrays**: an array form of each primitive and math type above. Arrays may be null.
* **Custom types**: any type that implements `ksISerializable`.

Because the conversions are implicit, you assign and read values with the plain C# type and let `ksMultiType` carry it:

```csharp
entity.Properties[Prop.SCORE] = 10;        // int in
int score = entity.Properties[Prop.SCORE]; // int out
```

## Where It Is Used

* **Properties**: a property map is a mapping of a numeric id to a `ksMultiType`. See [Automatic Client Data Syncing](/reactor/architecture/data-syncing.md).
* **RPC arguments**: RPC handlers receive `ksMultiType` values, so one call can pass mixed argument types. A handler can take a `ksMultiType[]` or list specific parameter types that convert from it. See [Messaging and RPCs](/reactor/architecture/messaging-rpcs.md).

## Where to Go Next

* [Automatic Client Data Syncing](/reactor/architecture/data-syncing.md): how properties sync.
* [Messaging and RPCs](/reactor/architecture/messaging-rpcs.md): how RPC arguments are passed.