---
title: "subscript(_:)"
framework: foundation
role: symbol
role_heading: Instance Subscript
path: "foundation/data/subscript(_:)-59z5z"
---

# subscript(_:)

Accesses the bytes at the specified range of indexes.

## Declaration

```swift
subscript<R>(rangeExpression: R) -> Data where R : RangeExpression, R.Bound : FixedWidthInteger { get set }
```