---
title: d
framework: combine
role: symbol
role_heading: Instance Property
path: combine/publishers/merge4/d
---

# d

A fourth publisher to merge.

## Declaration

```swift
let d: D
```

## See Also

### Inspecting publisher properties

- [a](combine/publishers/merge4/a.md)
- [b](combine/publishers/merge4/b.md)
- [c](combine/publishers/merge4/c.md)