---
title: "reduce(into:_:)"
framework: swift-package-manager
role: symbol
role_heading: Instance Method
path: "swift-package-manager/documentation/packageplugin/filelist/reduce(into:_:)"
---

# reduce(into:_:)

Inherited from Sequence.reduce(into:_:).

## Declaration

```swift
func reduce<Result>(into initialResult: Result, _ updateAccumulatingResult: (inout Result, Self.Element) throws -> ()) rethrows -> Result
```