---
title: "build_subscript(_:_:default:)"
framework: foundation
role: symbol
role_heading: Type Method
path: "foundation/predicateexpressions/build_subscript(_:_:default:)"
---

# build_subscript(_:_:default:)

## Declaration

```swift
static func build_subscript<Wrapped, Key, Default>(_ wrapped: Wrapped, _ key: Key, default: Default) -> PredicateExpressions.DictionaryKeyDefaultValueSubscript<Wrapped, Key, Default> where Wrapped : PredicateExpression, Key : PredicateExpression, Default : PredicateExpression, Wrapped.Output == [Key.Output : Default.Output], Key.Output : Hashable
```