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

# tryScan(_:_:)

## Declaration

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