What types of publishers exist in Swift Combine?
There are several types of publishers in the Combine framework for Swift language, each designed to handle specific use cases:
AnyPublisher: A type-erasing publisher that can wrap any publisher, allowing you to hide the specific publisher type from the rest of your code.PassthroughSubject: A publisher that allows you to manually send values to its subscribers. This is useful for cases where you need to trigger events manually, such as handling user input.CurrentValueSubject: A publisher that allows you to set an initial value and then emit new values over time, as we discussed in the previous answer.Future: A publisher that represents a single value that will be delivered in the future. This is useful for cases where you need to perform an asynchronous operation and return a value when it completes.Just: A publisher that emits a single value and then finishes immediately. This is useful for cases where you need to represent a constant value or a one-time event.Empty: A publisher that immediately finishes without emitting any values. This is useful for cases where you need to represent a one-time event that doesn’t have any associated data.Fail: A publisher that immediately fails with a specified error. This is useful for cases where you need to represent an error condition.Zip: A publisher that combines the latest values from multiple other publishers into a single value, and emits that value whenever any of the input publishers emit a new value.CombineLatest: A publisher that combines the latest values from multiple other publishers into a single value, and emits that value whenever any of the input publishers emit a new value.Merge: A publisher that merges the output of multiple publishers into a single stream of values.
These are just some of the most common types of publishers in Combine. Depending on your specific use case, you may find that other types of publishers, such as Deferred, SwitchToLatest, or Retry, are more appropriate for your needs.
