---
title: "reduce(_:_:)"
framework: combine
role: symbol
role_heading: Instance Method
path: "combine/publishers/sequence/reduce(_:_:)"
---

# reduce(_:_:)

## Declaration

```swift
func reduce<T>(_ initialResult: T, _ nextPartialResult: @escaping (T, Publishers.Sequence<Elements, Failure>.Output) -> T) -> Result<T, Failure>.Publisher
```

## See Also

### Reducing elements

- [collect()](combine/publishers/sequence/collect().md)
- [ignoreOutput()](combine/publishers/sequence/ignoreoutput().md)
- [tryReduce(_:_:)](combine/publishers/sequence/tryreduce(_:_:).md)