---
title: "subscript(_:_:_:)"
framework: foundation
role: symbol
role_heading: Instance Subscript
path: "foundation/attributedstring/runs-swift.struct/subscript(_:_:_:)-10o3s"
---

# subscript(_:_:_:)

## Declaration

```swift
@preconcurrency subscript<T, U, V>(t: KeyPath<AttributeDynamicLookup, T>, u: KeyPath<AttributeDynamicLookup, U>, v: KeyPath<AttributeDynamicLookup, V>) -> AttributedString.Runs.AttributesSlice3<T, U, V> where T : AttributedStringKey, U : AttributedStringKey, V : AttributedStringKey, T.Value : Sendable, U.Value : Sendable, V.Value : Sendable { get }
```