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# Publishers.CompactMap

A publisher that republishes all non-nil results of calling a closure with each received element.

```
struct CompactMap<Upstream, Output> where Upstream : Publisher
```

## Topics

### Creating a compact map publisher

[`init(upstream:transform:)`](/documentation/Combine/Publishers/CompactMap/init(upstream:transform:))

Creates a publisher that republishes all non-`nil` results of calling a closure with each received element.

### Declaring supporting types

[`Publishers.Output`](/documentation/Combine/Publishers/Output)

A publisher that publishes elements specified by a range in the sequence of published elements.

[`Publishers.CompactMap.Failure`](/documentation/Combine/Publishers/CompactMap/Failure)

The kind of errors this publisher might publish.

### Mapping elements

[`map(_:)`](/documentation/Combine/Publishers/CompactMap/map(_:))

[`compactMap(_:)`](/documentation/Combine/Publishers/CompactMap/compactMap(_:))

### Inspecting publisher properties

[`upstream`](/documentation/Combine/Publishers/CompactMap/upstream)

The publisher from which this publisher receives elements.

[`transform`](/documentation/Combine/Publishers/CompactMap/transform)

A closure that receives values from the upstream publisher and returns optional values.


---

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