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

# filter(_:)

## Declaration

```swift
func filter(_ isIncluded: (Publishers.Sequence<Elements, Failure>.Output) -> Bool) -> Publishers.Sequence<[Publishers.Sequence<Elements, Failure>.Output], Failure>
```

## See Also

### Filtering elements

- [compactMap(_:)](combine/publishers/sequence/compactmap(_:).md)
- [removeDuplicates()](combine/publishers/sequence/removeduplicates().md)