---
title: "scan(_:_:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/result/publisher-swift.struct/scan(_:_:)"
---

# scan(_:_:)

## Declaration

```swift
func scan<T>(_ initialResult: T, _ nextPartialResult: (T, Result<Success, Failure>.Publisher.Output) -> T) -> Result<T, Failure>.Publisher
```