---
title: "subscript(_:)"
framework: usdkit
role: symbol
role_heading: Instance Subscript
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+]
path: "usdkit/usdvalue/vec4d/subscript(_:)"
---

# subscript(_:)

Accesses the component at the specified index.

## Declaration

```swift
subscript(index: Int) -> Double { get set }
```