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

# scan(_:_:)

## Declaration

```swift
func scan<T>(_ initialResult: T, _ nextPartialResult: @escaping (T, Publishers.Sequence<Elements, Failure>.Output) -> T) -> Publishers.Sequence<[T], Failure>
```

## See Also

### Mapping elements

- [map(_:)](combine/publishers/sequence/map(_:).md)
- [setFailureType(to:)](combine/publishers/sequence/setfailuretype(to:).md)
- [replaceNil(with:)](combine/publishers/sequence/replacenil(with:).md)