---
title: predicate
framework: combine
role: symbol
role_heading: Instance Property
path: combine/publishers/removeduplicates/predicate
---

# predicate

The predicate closure used to evaluate whether two elements are duplicates.

## Declaration

```swift
let predicate: (Publishers.RemoveDuplicates<Upstream>.Output, Publishers.RemoveDuplicates<Upstream>.Output) -> Bool
```

## See Also

### Inspecting publisher properties

- [upstream](combine/publishers/removeduplicates/upstream.md)