A Swift protocol for adding customizable delayed completion to asynchronous operations, supporting generic result types.

DelayedCompletionHandler.swift

protocol DelayedCompletionHandler {
    // Define a generic method for delayed completion
    func delayedCompletion<T>(
        _ result: Result<T, Error>,
        _ completion: @escaping (Result<T, Error>) -> Void
    )
}

extension DelayedCompletionHandler {
    // Generic function with a generic result type
    func delayedCompletion<T>(
        _ result: Result<T, Error>,
        _ completion: @escaping (Result<T, Error>) -> Void
    ) {
        // Generate a random delay between 1 millisecond and 1 second
        let delay = Double.random(in: 0.001...1.0)
        DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
            completion(result)
        }
    }
}

func simpleImplementation(completion: @escaping (Result<String, Error>) -> Void) {
        delayedCompletion(.success("Hello World"), completion)
}