---
title: Entity.Observable.Components
framework: realitykit
role: symbol
role_heading: Structure
path: realitykit/entity/observable-swift.struct/components-swift.struct
---

# Entity.Observable.Components

An observable collection of an entity’s attached components, allowing for reactive updates based on component changes.

## Declaration

```swift
struct Components
```

## Overview

Overview Reading a component from this set establishes observation tracking. See Observation for more details.

## Topics

### Subscripts

- [subscript(_:)](realitykit/entity/observable-swift.struct/components-swift.struct/subscript(_:).md)