---
title: Publishers.Zip4.Output
framework: combine
role: symbol
role_heading: Type Alias
path: combine/publishers/zip4/output
---

# Publishers.Zip4.Output

The kind of values published by this publisher.

## Declaration

```swift
typealias Output = (A.Output, B.Output, C.Output, D.Output)
```

## Discussion

Discussion This publisher produces four-element tuples, whose members’ types correspond to the types produced by the upstream publishers.

## See Also

### Declaring supporting types

- [Publishers.Zip4.Failure](combine/publishers/zip4/failure.md)