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| # RxSwift to ReactiveSwift Cheatsheet | ||
| This is a Cheatsheet for [RxSwift](https://github.com/ReactiveX/RxSwift) developers migrating to projects using [ReactiveSwift](https://github.com/ReactiveCocoa/ReactiveSwift). | ||
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| Inspired by the [RxSwift to Combine cheatsheet](https://github.com/CombineCommunity/rxswift-to-combine-cheatsheet) | ||
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| ## Basics | ||
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| | | RxSwift | ReactiveSwift | | ||
| |-----------------------|----------------------------------|--------------------------------------------| | ||
| | Deployment Target | iOS 8.0+ | iOS 8.0+ | ||
| | Platforms supported | iOS, macOS, tvOS, watchOS, Linux | iOS, macOS, tvOS, watchOS, Linux | ||
| | Spec | Reactive Extensions (ReactiveX) | Originally ReactiveX, with significant divergence | ||
| | Framework Consumption | Third-party | Third-party | ||
| | Maintained by | Open-Source / Community | Open-Source / Community | ||
| | UI Bindings | RxCocoa | ReactiveCocoa | ||
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| ## Core Components | ||
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| | RxSwift | ReactiveSwift | Notes | | ||
| |---------------------------|---------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------| | ||
| | AnyObserver | Signal.Observer | In practice, since there are no different Observer types, the AnyObserver concept is redundant in ReactiveSwift | ||
| | BehaviorRelay | Property / MutableProperty | Since `MutableProperty` can never have errors, we don't need a Relay specific version. | ||
| | BehaviorSubject | Property / MutableProperty | | ||
| | Completable | Signal / SignalProducer | A `Signal` or `SignalProducer` where `Value == Never` can only complete or emit an error event | ||
| | CompositeDisposable | CompositeDisposable | | ||
| | ConnectableObservableType | ❌ | | ||
| | Disposable | Disposable | In ReactiveSwift you rarely have to keep hold of Disposables or manage their lifetime manually, it's mostly automatic. | ||
| | DisposeBag | CompositeDisposable | The concepte of a DisposeBag is not really needed in ReactiveSwift, see above. | ||
| | Driver | ❌ | | ||
| | Maybe | ❌ | Trivial to create using `take(first: 1)` | ||
| | Observable | Signal / SignalProducer | Signal is a "hot" observable, and SignalProducer is a "cold" observable that will only emit values once a subscription is started | ||
| | Observer | Signal.Observer | | ||
| | PublishRelay | ❌ | Could be recreated easily in ReactiveSwift using the `flatMapError` operator on a Signal.pipe() | ||
| | PublishSubject | Signal.pipe() | There is no Subject type, but `Signal.pipe()` returns a tuple of `(output: Signal, input: Signal.Observer)` which you use to both observe and send values | ||
| | ReplaySubject | ❌ | Can be created using the `replayLazily(upTo:)` operator | ||
| | ScheduledDisposable | ❌ | | ||
| | SchedulerType | Scheduler | | ||
| | SerialDisposable | SerialDisposable | | ||
| | Signal | ❌ | Not to be confused with ReactiveSwift `Signal` which is completely different | ||
| | Single | ❌ | Could easily be created as an initializer for `SignalProducer` | ||
| | SubjectType | Signal.pipe() | There is no Subject type, but `Signal.pipe()` returns a tuple of `(output: Signal, input: Signal.Observer)` which you use to both observe and send values | ||
| | TestScheduler | TestScheduler | | ||
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| ## Operators | ||
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| | RxSwift | Combine | Notes | | ||
| |-----------------------|------------------------------------------|----------------------------------------------------------------------------------------------------------| | ||
| | amb() | flatten(.race) | | ||
| | asObservable() | ❌ | Not required in ReactiveSwift, although `Property.producer` and `Property.signal` are similar | ||
| | asObserver() | ❌ | | ||
| | bind(to:) | <~ operator (BindingTargets) | | ||
| | buffer | ❌ | (it used to exist, but was removed) | ||
| | catchError | flatMapError | | ||
| | catchErrorJustReturn | ❌ | Easy to create as `flatMapError { _ in SignalProducer<Value, Never> (value: value) }` | ||
| | combineLatest | combineLatest | | ||
| | compactMap | compactMap | | ||
| | concat | concat / prefix | | ||
| | concatMap | ❌ | | ||
| | create | SignalProducer.init { } | | ||
| | debounce | debounce | | ||
| | debug | logEvents | | ||
| | deferred | ❌ | Trivial to create | ||
| | delay | delay | | ||
| | delaySubscription | ❌ | | ||
| | dematerialize | dematerialize | | ||
| | distinctUntilChanged | skipRepeats | | ||
| | do | on | | ||
| | elementAt | ❌ | | ||
| | empty | SignalProducer.empty | | ||
| | enumerated | ❌ | | ||
| | error | SignalProducer.init(error:) | | ||
| | filter | filter | | ||
| | first | take(first:) | See also `take(last:)` | ||
| | flatMap | flatMap(.merge) | | ||
| | flatMapFirst | flatMap(.throttle) | | ||
| | flatMapLatest | flatMap(.latest) | | ||
| | from(optional:) | ❌ | Easy to create using `.init(.value: Value?).skipNil()` | ||
| | groupBy | ❌ | | ||
| | ifEmpty(default:) | ❌ | | ||
| | ifEmpty(switchTo:) | ❌ | | ||
| | ignoreElements | ❌ | Easy to create | ||
| | interval | ❌ | | ||
| | just | SignalProducer.init(value:) | | ||
| | map | map | | ||
| | materialize | materialize | | ||
| | merge | merge | | ||
| | merge(maxConcurrent:) | ❌ | | ||
| | multicast | replayLazily(upTo:) | | ||
| | never | SignalProducer.never | | ||
| | observeOn | observe(on:) | | ||
| | of | SignalProducer.init(_ values:) | | ||
| | publish | ❌ | | ||
| | range | ❌ | | ||
| | reduce | reduce | | ||
| | refCount | ❌ | Not meaningful in ReactiveSwift | ||
| | repeatElement | repeat | | ||
| | retry, retry(3) | retry(upTo:) | | ||
| | retryWhen | ❌ | | ||
| | sample | sample(on:), sample(with:) | | ||
| | scan | scan | | ||
| | share | replayLazily(upTo:) | | ||
| | skip | skip(first:) | | ||
| | skipUntil | skip(until:) | | ||
| | skipWhile | skip(while:) | | ||
| | startWith | prefix | | ||
| | subscribe | startWithValues / observeValues | | ||
| | subscribeOn | start(on:) / observe(on:) | | ||
| | takeLast | take(last:) | | ||
| | takeUntil | take(until:) | | ||
| | throttle | throttle | | ||
| | timeout | timeout | | ||
| | timer | SignalProducer.timer | | ||
| | toArray | collect | | ||
| | window | ❌ | | ||
| | withLatestFrom | combineLatest | | ||
| | zip | zip | |
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