---
title: Publishers.ContainsWhere
framework: combine
role: symbol
role_heading: Structure
path: combine/publishers/containswhere
---

# Publishers.ContainsWhere

A publisher that emits a Boolean value upon receiving an element that satisfies the predicate closure.

## Declaration

```swift
struct ContainsWhere<Upstream> where Upstream : Publisher
```

## Topics

### Creating a contains where publisher

- [init(upstream:predicate:)](combine/publishers/containswhere/init(upstream:predicate:).md)

### Declaring supporting types

- [Publishers.ContainsWhere.Output](combine/publishers/containswhere/output.md)
- [Publishers.ContainsWhere.Failure](combine/publishers/containswhere/failure.md)

### Inspecting publisher properties

- [upstream](combine/publishers/containswhere/upstream.md)
- [predicate](combine/publishers/containswhere/predicate.md)

## Relationships

### Conforms To

- [Publisher](combine/publisher.md)

## See Also

### Applying matching criteria to elements

- [Publishers.Contains](combine/publishers/contains.md)
- [Publishers.TryContainsWhere](combine/publishers/trycontainswhere.md)
- [Publishers.AllSatisfy](combine/publishers/allsatisfy.md)
- [Publishers.TryAllSatisfy](combine/publishers/tryallsatisfy.md)