---
title: "removeDuplicates(by:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/result/publisher-swift.struct/removeduplicates(by:)"
---

# removeDuplicates(by:)

## Declaration

```swift
func removeDuplicates(by predicate: (Result<Success, Failure>.Publisher.Output, Result<Success, Failure>.Publisher.Output) -> Bool) -> Result<Result<Success, Failure>.Publisher.Output, Failure>.Publisher
```