<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Swift",
  "identifier" : "/documentation/Swift/AsyncCompactMapSequence",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "Swift"
    ],
    "preciseIdentifier" : "s:12_Concurrency23AsyncCompactMapSequenceV"
  },
  "title" : "AsyncCompactMapSequence"
}
-->

# AsyncCompactMapSequence

An asynchronous sequence that maps a given closure over the asynchronous
sequence’s elements, omitting results that don’t return a value.

```
struct AsyncCompactMapSequence<Base, ElementOfResult> where Base : AsyncSequence
```

## Topics

### Structures

[`struct Iterator`](/documentation/Swift/AsyncCompactMapSequence/Iterator)

The iterator that produces elements of the compact map sequence.

### Type Aliases

[`typealias Failure`](/documentation/Swift/AsyncCompactMapSequence/Failure)

The type of the error that can be produced by the sequence.

### Default Implementations

[AsyncSequence Implementations](/documentation/Swift/AsyncCompactMapSequence/AsyncSequence-Implementations)

## Relationships

### Conforms To

[`Sendable`](/documentation/Swift/Sendable)

[`AsyncSequence`](/documentation/Swift/AsyncSequence)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Escapable`](/documentation/Swift/Escapable)

[`Copyable`](/documentation/Swift/Copyable)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)