Bridging Result to async/await
Converting callback-based Result APIs into async throwing functions.
Welcome
Legacy callback-based APIs return `Result`. Modern code uses async/await. Bridging between them is a common task — Swift has clean patterns for both directions.
withCheckedThrowingContinuation
```swift
func fetchAsync(url: URL) async throws -> Data {
try await withCheckedThrowingContinuation { cont in
fetchCallback(url) { result in
cont.resume(with: result)
}
}
}
```
`cont.resume(with: result)` accepts a `Result` directly.
All lessons in this course
- Result Fundamentals
- map and flatMap on Result
- Custom Error Types with LocalizedError
- Bridging Result to async/await