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# merge(with:_:_:_:)

Combines elements from this publisher with those from four other publishers, delivering an interleaved sequence of elements.

```
func merge<B, C, D, E>(with b: B, _ c: C, _ d: D, _ e: E) -> Publishers.Merge5<Self, B, C, D, E> where B : Publisher, C : Publisher, D : Publisher, E : Publisher, Self.Failure == B.Failure, Self.Output == B.Output, B.Failure == C.Failure, B.Output == C.Output, C.Failure == D.Failure, C.Output == D.Output, D.Failure == E.Failure, D.Output == E.Output
```

## Parameters

`b`

A second publisher.

`c`

A third publisher.

`d`

A fourth publisher.

`e`

A fifth publisher.

## Return Value

A publisher that emits an event when any upstream publisher emits an event.

## Discussion

Use [`merge(with:_:_:_:)`](/documentation/Combine/Publisher/merge(with:_:_:_:)) when you want to receive a new element whenever any of the upstream publishers emits an element. To receive tuples of the most-recent value from all the upstream publishers whenever any of them emit a value, use [`combineLatest(_:_:_:)`](/documentation/Combine/Publisher/combineLatest(_:_:_:)-48buc).
To combine elements from multiple upstream publishers, use [`zip(_:_:_:)`](/documentation/Combine/Publisher/zip(_:_:_:)-16rcy).

In this example, as [`merge(with:_:_:_:)`](/documentation/Combine/Publisher/merge(with:_:_:_:)) receives input from the upstream publishers, it republishes the interleaved elements to the downstream:

```
 let pubA = PassthroughSubject<Int, Never>()
 let pubB = PassthroughSubject<Int, Never>()
 let pubC = PassthroughSubject<Int, Never>()
 let pubD = PassthroughSubject<Int, Never>()
 let pubE = PassthroughSubject<Int, Never>()

 cancellable = pubA
     .merge(with: pubB, pubC, pubD, pubE)
     .sink { print("\($0)", terminator: " " ) }

 pubA.send(1)
 pubB.send(40)
 pubC.send(90)
 pubD.send(-1)
 pubE.send(33)
 pubA.send(2)
 pubB.send(50)
 pubC.send(100)
 pubD.send(-2)
 pubE.send(33)

 // Prints: "1 40 90 -1 33 2 50 100 -2 33"
```

The merged publisher continues to emit elements until all upstream publishers finish.
If an upstream publisher produces an error, the merged publisher fails with that error.

---

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