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# init(upstream:isIncluded:)

Creates a publisher that republishes all elements that match a provided error-throwing closure.

```
init(upstream: Upstream, isIncluded: @escaping (Upstream.Output) throws -> Bool)
```

## Parameters

`upstream`

The publisher from which this publisher receives elements.

`isIncluded`

An error-throwing closure that indicates whether this filter should republish an element.

---

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