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

# build_filter(_:_:)

## Declaration

```swift
static func build_filter<LHS, RHS>(_ lhs: LHS, _ builder: (PredicateExpressions.Variable<LHS.Output.Element>) -> RHS) -> PredicateExpressions.Filter<LHS, RHS> where LHS : PredicateExpression, RHS : PredicateExpression, LHS.Output : Sequence, RHS.Output == Bool
```