---
title: keyPath1
framework: combine
role: symbol
role_heading: Instance Property
path: combine/publishers/mapkeypath3/keypath1
---

# keyPath1

The key path of a second property to publish.

## Declaration

```swift
let keyPath1: KeyPath<Upstream.Output, Output1>
```

## See Also

### Inspecting publisher properties

- [upstream](combine/publishers/mapkeypath3/upstream.md)
- [keyPath0](combine/publishers/mapkeypath3/keypath0.md)
- [keyPath2](combine/publishers/mapkeypath3/keypath2.md)