---
title: "buildExpression(_:)"
framework: realitykit
role: symbol
role_heading: Type Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+]
path: "realitykit/skeletonresource/jointbuilder/buildexpression(_:)"
---

# buildExpression(_:)

Treats a single Joint value in the closure body as one child of the parent.

## Declaration

```swift
static func buildExpression(_ expression: SkeletonResource.Joint) -> [SkeletonResource.Joint]
```