<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 18.0.0 -",
    "macOS: 15.0.0 -",
    "tvOS: 18.0.0 -",
    "visionOS: 2.0.0 -",
    "watchOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Swift",
  "identifier" : "/documentation/Swift/AsyncStream/Iterator/next()-2smzy",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Swift"
    ],
    "preciseIdentifier" : "s:ScI12_ConcurrencyE4next7ElementQzSgyYa7FailureQzYKF::SYNTHESIZED::s:ScS8IteratorV"
  },
  "title" : "next()"
}
-->

# next()

Default implementation of `next()` in terms of `next(isolation:)`, which
is required to maintain backward compatibility with existing async
iterators.

```
mutating func next() async throws(Self.Failure) -> Self.Element?
```

---

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)