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# Publishers.Catch

A publisher that handles errors from an upstream publisher by replacing the failed publisher with another publisher.

```
struct Catch<Upstream, NewPublisher> where Upstream : Publisher, NewPublisher : Publisher, Upstream.Output == NewPublisher.Output
```

## Topics

### Creating a catch publisher

[`init(upstream:handler:)`](/documentation/Combine/Publishers/Catch/init(upstream:handler:))

Creates a publisher that handles errors from an upstream publisher by replacing the failed publisher with another publisher.

### Declaring supporting types

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

The kind of values published by this publisher.

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

The kind of errors this publisher might publish.

### Inspecting publisher properties

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

The publisher from which this publisher receives its elements.

[`handler`](/documentation/Combine/Publishers/Catch/handler)

A closure that accepts the upstream failure as input and returns a publisher to replace the upstream publisher.


---

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