How do I create custom Result types and error domains?

In Swift, you can create custom `Result` types and error domains to handle asynchronous tasks more effectively. This allows for better error handling and a more descriptive representation of outcomes in your applications.

Here’s a simple example of how to create a custom `Result` type and an associated error type.

// Define an enum for custom errors enum MyError: Error { case networkError case parsingError case unknownError } // Define a custom Result type struct Result { var value: T? var error: U? } // Example of using the custom Result type func fetchData(completion: (Result) -> Void) { // Simulate a network call let success = true // Change to false to simulate an error if success { completion(Result(value: "Data fetched successfully", error: nil)) } else { completion(Result(value: nil, error: .networkError)) } } // Usage fetchData { result in switch result { case let .success(value): print(value) case let .failure(error): print("Error: \(error)") } }

custom Result types error domains Swift error handling asynchronous tasks custom errors

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