# EntityCollection Implementations ## Topics ### Instance Methods [`func append(contentsOf: S)`](/documentation/RealityKit/Entity/ChildCollection/append(contentsOf:)) Adds the specified list of entity as children to this entity. [`func remove(Entity)`](/documentation/RealityKit/Entity/ChildCollection/remove(_:)) Removes the specified child from this entity. [`func remove(at: Int)`](/documentation/RealityKit/Entity/ChildCollection/remove(at:)) Removes the specified child from this entity. [`func removeAll()`](/documentation/RealityKit/Entity/ChildCollection/removeAll()) Removes all children from this entity. [`func replaceAll(S)`](/documentation/RealityKit/Entity/ChildCollection/replaceAll(_:)) Removes all children from this entity and adds the specified list of entities as the new children. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)