278 lines
18 KiB
Markdown
278 lines
18 KiB
Markdown
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# RxDart
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<p align="right">
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<a href="https://flutter.dev/docs/development/packages-and-plugins/favorites"><img src="https://docs.flutter.dev/assets/images/docs/development/packages-and-plugins/FlutterFavoriteLogo.png" width="100" alt="build"></a>
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</p>
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<p align="center">
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<img src="https://github.com/ReactiveX/rxdart/blob/master/packages/rxdart/screenshots/logo.png?raw=true" height="200" alt="RxDart" />
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</p>
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[](https://github.com/ReactiveX/rxdart/actions)
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[](https://codecov.io/gh/ReactiveX/rxdart)
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[](https://pub.dartlang.org/packages/rxdart)
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[](https://pub.dartlang.org/packages/rxdart)
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[](https://gitter.im/ReactiveX/rxdart)
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[](https://docs.flutter.dev/data-and-backend/state-mgmt/options#bloc--rx)
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[](https://github.com/ReactiveX/rxdart/actions/workflows/flutter-example.yml)
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[](https://www.apache.org/licenses/LICENSE-2.0)
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[](https://hits.seeyoufarm.com)
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## About
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RxDart extends the capabilities of Dart
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[Streams](https://api.dart.dev/stable/dart-async/Stream-class.html) and
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[StreamControllers](https://api.dart.dev/stable/dart-async/StreamController-class.html).
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Dart comes with a very decent
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[Streams](https://api.dart.dev/stable/dart-async/Stream-class.html) API
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out-of-the-box; rather than attempting to provide an alternative to this API,
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RxDart adds functionality from the reactive extensions specification on top of
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it.
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RxDart does not provide its Observable class as a replacement for Dart
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Streams. Instead, it offers several additional Stream classes, operators
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(extension methods on the Stream class), and Subjects.
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If you are familiar with Observables from other languages, please see [the Rx
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Observables vs. Dart Streams comparison chart](#rx-observables-vs-dart-streams)
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for notable distinctions between the two.
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## Upgrading from RxDart 0.22.x to 0.23.x
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RxDart 0.23.x moves away from the Observable class, utilizing Dart 2.6's new
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extension methods instead. This requires several small refactors that can be
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easily automated -- which is just what we've done!
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Please follow the instructions on the
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[rxdart_codemod](https://pub.dev/packages/rxdart_codemod) package to
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automatically upgrade your code to support RxDart 0.23.x.
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## How To Use RxDart
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### For Example: Reading the Konami Code
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```dart
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import 'package:rxdart/rxdart.dart';
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void main() {
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const konamiKeyCodes = <int>[
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KeyCode.UP,
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KeyCode.UP,
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KeyCode.DOWN,
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KeyCode.DOWN,
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KeyCode.LEFT,
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KeyCode.RIGHT,
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KeyCode.LEFT,
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KeyCode.RIGHT,
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KeyCode.B,
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KeyCode.A,
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];
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final result = querySelector('#result')!;
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document.onKeyUp
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.map((event) => event.keyCode)
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.bufferCount(10, 1) // An extension method provided by rxdart
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.where((lastTenKeyCodes) => const IterableEquality<int>().equals(lastTenKeyCodes, konamiKeyCodes))
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.listen((_) => result.innerHtml = 'KONAMI!');
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}
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```
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## API Overview
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RxDart adds functionality to Dart Streams in three ways:
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* [Stream Classes](#stream-classes) - create Streams with specific capabilities, such as combining or merging many Streams.
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* [Extension Methods](#extension-methods) - transform a source Stream into a new Stream with different capabilities, such as throttling or buffering events.
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* [Subjects](#subjects) - StreamControllers with additional powers
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### Stream Classes
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The Stream class provides different ways to create a Stream: `Stream.fromIterable` or `Stream.periodic`. RxDart provides additional Stream classes for a variety of tasks, such as combining or merging Streams!
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You can construct the Streams provided by RxDart in two ways. The following examples are equivalent in terms of functionality:
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- Instantiating the Stream class directly.
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- Example: `final mergedStream = MergeStream([myFirstStream, mySecondStream]);`
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- Using static factories from the Rx class, which are useful for discovering which types of Streams are provided by RxDart. Under the hood, these factories call the corresponding Stream constructor.
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- Example: `final mergedStream = Rx.merge([myFirstStream, mySecondStream]);`
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#### List of Classes / Static Factories
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- [CombineLatestStream](https://pub.dev/documentation/rxdart/latest/rx/CombineLatestStream-class.html) (combine2, combine3... combine9) / [Rx.combineLatest2](https://pub.dev/documentation/rxdart/latest/rx/Rx/combineLatest2.html)...[Rx.combineLatest9](https://pub.dev/documentation/rxdart/latest/rx/Rx/combineLatest9.html)
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- [ConcatStream](https://pub.dev/documentation/rxdart/latest/rx/ConcatStream-class.html) / [Rx.concat](https://pub.dev/documentation/rxdart/latest/rx/Rx/concat.html)
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- [ConcatEagerStream](https://pub.dev/documentation/rxdart/latest/rx/ConcatEagerStream-class.html) / [Rx.concatEager](https://pub.dev/documentation/rxdart/latest/rx/Rx/concatEager.html)
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- [DeferStream](https://pub.dev/documentation/rxdart/latest/rx/DeferStream-class.html) / [Rx.defer](https://pub.dev/documentation/rxdart/latest/rx/Rx/defer.html)
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- [ForkJoinStream](https://pub.dev/documentation/rxdart/latest/rx/ForkJoinStream-class.html) (join2, join3... join9) / [Rx.forkJoin2](https://pub.dev/documentation/rxdart/latest/rx/Rx/forkJoin2.html)...[Rx.forkJoin9](https://pub.dev/documentation/rxdart/latest/rx/Rx/forkJoin9.html)
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- [FromCallableStream](https://pub.dev/documentation/rxdart/latest/rx/FromCallableStream-class.html) / [Rx.fromCallable](https://pub.dev/documentation/rxdart/latest/rx/Rx/fromCallable.html)
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- [MergeStream](https://pub.dev/documentation/rxdart/latest/rx/MergeStream-class.html) / [Rx.merge](https://pub.dev/documentation/rxdart/latest/rx/Rx/merge.html)
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- [NeverStream](https://pub.dev/documentation/rxdart/latest/rx/NeverStream-class.html) / [Rx.never](https://pub.dev/documentation/rxdart/latest/rx/Rx/never.html)
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- [RaceStream](https://pub.dev/documentation/rxdart/latest/rx/RaceStream-class.html) / [Rx.race](https://pub.dev/documentation/rxdart/latest/rx/Rx/race.html)
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- [RangeStream](https://pub.dev/documentation/rxdart/latest/rx/RangeStream-class.html) / [Rx.range](https://pub.dev/documentation/rxdart/latest/rx/Rx/range.html)
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- [RepeatStream](https://pub.dev/documentation/rxdart/latest/rx/RepeatStream-class.html) / [Rx.repeat](https://pub.dev/documentation/rxdart/latest/rx/Rx/repeat.html)
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- [RetryStream](https://pub.dev/documentation/rxdart/latest/rx/RetryStream-class.html) / [Rx.retry](https://pub.dev/documentation/rxdart/latest/rx/Rx/retry.html)
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- [RetryWhenStream](https://pub.dev/documentation/rxdart/latest/rx/RetryWhenStream-class.html) / [Rx.retryWhen](https://pub.dev/documentation/rxdart/latest/rx/Rx/retryWhen.html)
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- [SequenceEqualStream](https://pub.dev/documentation/rxdart/latest/rx/SequenceEqualStream-class.html) / [Rx.sequenceEqual](https://pub.dev/documentation/rxdart/latest/rx/Rx/sequenceEqual.html)
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- [SwitchLatestStream](https://pub.dev/documentation/rxdart/latest/rx/SwitchLatestStream-class.html) / [Rx.switchLatest](https://pub.dev/documentation/rxdart/latest/rx/Rx/switchLatest.html)
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- [TimerStream](https://pub.dev/documentation/rxdart/latest/rx/TimerStream-class.html) / [Rx.timer](https://pub.dev/documentation/rxdart/latest/rx/Rx/timer.html)
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- [UsingStream](https://pub.dev/documentation/rxdart/latest/rx/UsingStream-class.html) / [Rx.using](https://pub.dev/documentation/rxdart/latest/rx/Rx/using.html)
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- [ZipStream](https://pub.dev/documentation/rxdart/latest/rx/ZipStream-class.html) (zip2, zip3, zip4, ..., zip9) / [Rx.zip](https://pub.dev/documentation/rxdart/latest/rx/Rx/zip2.html)...[Rx.zip9](https://pub.dev/documentation/rxdart/latest/rx/Rx/zip9.html)
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- If you're looking for an [Interval](https://reactivex.io/documentation/operators/interval.html) equivalent, check out Dart's [Stream.periodic](https://api.dart.dev/stable/2.7.2/dart-async/Stream/Stream.periodic.html) for similar behavior.
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### Extension Methods
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The extension methods provided by RxDart can be used on any `Stream`. They convert a source Stream into a new Stream with additional capabilities, such as buffering or throttling events.
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#### Example
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```dart
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Stream.fromIterable([1, 2, 3])
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.throttleTime(Duration(seconds: 1))
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.listen(print); // prints 1
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```
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#### List of Extension Methods
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- [buffer](https://pub.dev/documentation/rxdart/latest/rx/BufferExtensions/buffer.html)
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- [bufferCount](https://pub.dev/documentation/rxdart/latest/rx/BufferExtensions/bufferCount.html)
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- [bufferTest](https://pub.dev/documentation/rxdart/latest/rx/BufferExtensions/bufferTest.html)
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- [bufferTime](https://pub.dev/documentation/rxdart/latest/rx/BufferExtensions/bufferTime.html)
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- [concatWith](https://pub.dev/documentation/rxdart/latest/rx/ConcatExtensions/concatWith.html)
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- [debounce](https://pub.dev/documentation/rxdart/latest/rx/DebounceExtensions/debounce.html)
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- [debounceTime](https://pub.dev/documentation/rxdart/latest/rx/DebounceExtensions/debounceTime.html)
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- [defaultIfEmpty](https://pub.dev/documentation/rxdart/latest/rx/DefaultIfEmptyExtension/defaultIfEmpty.html)
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- [delay](https://pub.dev/documentation/rxdart/latest/rx/DelayExtension/delay.html)
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- [delayWhen](https://pub.dev/documentation/rxdart/latest/rx/DelayWhenExtension/delayWhen.html)
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- [dematerialize](https://pub.dev/documentation/rxdart/latest/rx/DematerializeExtension/dematerialize.html)
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- [distinctUnique](https://pub.dev/documentation/rxdart/latest/rx/DistinctUniqueExtension/distinctUnique.html)
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- [doOnCancel](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnCancel.html)
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- [doOnData](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnData.html)
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- [doOnDone](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnDone.html)
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- [doOnEach](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnEach.html)
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- [doOnError](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnError.html)
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- [doOnListen](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnListen.html)
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- [doOnPause](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnPause.html)
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- [doOnResume](https://pub.dev/documentation/rxdart/latest/rx/DoExtensions/doOnResume.html)
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- [endWith](https://pub.dev/documentation/rxdart/latest/rx/EndWithExtension/endWith.html)
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- [endWithMany](https://pub.dev/documentation/rxdart/latest/rx/EndWithManyExtension/endWithMany.html)
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- [exhaustMap](https://pub.dev/documentation/rxdart/latest/rx/ExhaustMapExtension/exhaustMap.html)
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- [flatMap](https://pub.dev/documentation/rxdart/latest/rx/FlatMapExtension/flatMap.html)
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- [flatMapIterable](https://pub.dev/documentation/rxdart/latest/rx/FlatMapExtension/flatMapIterable.html)
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- [groupBy](https://pub.dev/documentation/rxdart/latest/rx/GroupByExtension/groupBy.html)
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- [interval](https://pub.dev/documentation/rxdart/latest/rx/IntervalExtension/interval.html)
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- [mapNotNull](https://pub.dev/documentation/rxdart/latest/rx/MapNotNullExtension/mapNotNull.html)
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- [mapTo](https://pub.dev/documentation/rxdart/latest/rx/MapToExtension/mapTo.html)
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- [materialize](https://pub.dev/documentation/rxdart/latest/rx/MaterializeExtension/materialize.html)
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- [max](https://pub.dev/documentation/rxdart/latest/rx/MaxExtension/max.html)
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- [mergeWith](https://pub.dev/documentation/rxdart/latest/rx/MergeExtension/mergeWith.html)
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- [min](https://pub.dev/documentation/rxdart/latest/rx/MinExtension/min.html)
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- [onErrorResume](https://pub.dev/documentation/rxdart/latest/rx/OnErrorExtensions/onErrorResume.html)
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- [onErrorResumeNext](https://pub.dev/documentation/rxdart/latest/rx/OnErrorExtensions/onErrorResumeNext.html)
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- [onErrorReturn](https://pub.dev/documentation/rxdart/latest/rx/OnErrorExtensions/onErrorReturn.html)
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- [onErrorReturnWith](https://pub.dev/documentation/rxdart/latest/rx/OnErrorExtensions/onErrorReturnWith.html)
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- [pairwise](https://pub.dev/documentation/rxdart/latest/rx/PairwiseExtension/pairwise.html)
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- [sample](https://pub.dev/documentation/rxdart/latest/rx/SampleExtensions/sample.html)
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- [sampleTime](https://pub.dev/documentation/rxdart/latest/rx/SampleExtensions/sampleTime.html)
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- [scan](https://pub.dev/documentation/rxdart/latest/rx/ScanExtension/scan.html)
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- [skipLast](https://pub.dev/documentation/rxdart/latest/rx/SkipLastExtension/skipLast.html)
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- [skipUntil](https://pub.dev/documentation/rxdart/latest/rx/SkipUntilExtension/skipUntil.html)
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- [startWith](https://pub.dev/documentation/rxdart/latest/rx/StartWithExtension/startWith.html)
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- [startWithMany](https://pub.dev/documentation/rxdart/latest/rx/StartWithManyExtension/startWithMany.html)
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- [switchIfEmpty](https://pub.dev/documentation/rxdart/latest/rx/SwitchIfEmptyExtension/switchIfEmpty.html)
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- [switchMap](https://pub.dev/documentation/rxdart/latest/rx/SwitchMapExtension/switchMap.html)
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- [takeLast](https://pub.dev/documentation/rxdart/latest/rx/TakeLastExtension/takeLast.html)
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- [takeUntil](https://pub.dev/documentation/rxdart/latest/rx/TakeUntilExtension/takeUntil.html)
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- [takeWhileInclusive](https://pub.dev/documentation/rxdart/latest/rx/TakeWhileInclusiveExtension/takeWhileInclusive.html)
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- [throttle](https://pub.dev/documentation/rxdart/latest/rx/ThrottleExtensions/throttle.html)
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- [throttleTime](https://pub.dev/documentation/rxdart/latest/rx/ThrottleExtensions/throttleTime.html)
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- [timeInterval](https://pub.dev/documentation/rxdart/latest/rx/TimeIntervalExtension/timeInterval.html)
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- [timestamp](https://pub.dev/documentation/rxdart/latest/rx/TimeStampExtension/timestamp.html)
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- [whereNotNull](https://pub.dev/documentation/rxdart/latest/rx/WhereNotNullExtension/whereNotNull.html)
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- [whereType](https://pub.dev/documentation/rxdart/latest/rx/WhereTypeExtension/whereType.html)
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- [window](https://pub.dev/documentation/rxdart/latest/rx/WindowExtensions/window.html)
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- [windowCount](https://pub.dev/documentation/rxdart/latest/rx/WindowExtensions/windowCount.html)
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- [windowTest](https://pub.dev/documentation/rxdart/latest/rx/WindowExtensions/windowTest.html)
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- [windowTime](https://pub.dev/documentation/rxdart/latest/rx/WindowExtensions/windowTime.html)
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- [withLatestFrom](https://pub.dev/documentation/rxdart/latest/rx/WithLatestFromExtensions.html)
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- [zipWith](https://pub.dev/documentation/rxdart/latest/rx/ZipWithExtension/zipWith.html)
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### Subjects
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Dart provides the [StreamController](https://api.dart.dev/stable/dart-async/StreamController-class.html) class to create and manage a Stream. RxDart offers two additional StreamControllers with additional capabilities, known as Subjects:
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- [BehaviorSubject](https://pub.dev/documentation/rxdart/latest/rx/BehaviorSubject-class.html) - A broadcast StreamController that caches the latest added value or error. When a new listener subscribes to the Stream, the latest value or error will be emitted to the listener. Furthermore, you can synchronously read the last emitted value.
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- [ReplaySubject](https://pub.dev/documentation/rxdart/latest/rx/ReplaySubject-class.html) - A broadcast StreamController that caches the added values. When a new listener subscribes to the Stream, the cached values will be emitted to the listener.
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## Rx Observables vs Dart Streams
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In many situations, Streams and Observables work the same way. However, if you're used to standard Rx Observables, some features of the Stream API may surprise you. We've included a table below to help folks understand the differences.
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Additional information about the following situations can be found by reading the [Rx class documentation](https://pub.dev/documentation/rxdart/latest/rx/Rx-class.html).
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| Situation | Rx Observables | Dart Streams |
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| ------------- |------------- | ------------- |
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| An error is raised | Observable Terminates with Error | Error is emitted and Stream continues |
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| Cold Observables | Multiple subscribers can listen to the same cold Observable, and each subscription will receive a unique Stream of data | Single subscriber only |
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| Hot Observables | Yes | Yes, known as Broadcast Streams |
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| Is {Publish, Behavior, Replay}Subject hot? | Yes | Yes |
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| Single/Maybe/Completable ? | Yes | Yes, uses [rxdart_ext Single](https://pub.dev/documentation/rxdart_ext/latest/rxdart_ext/Single-class.html) (`Completable == Single<void>` and `Maybe<T> == Single<T?>`) |
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| Support back pressure| Yes | Yes |
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| Can emit null? | Yes, except RxJava | Yes |
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| Sync by default | Yes | No |
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| Can pause/resume a subscription*? | No | Yes |
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## Examples
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Web and command-line examples can be found in the `example` folder.
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### Web Examples
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In order to run the web examples, please follow these steps:
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1. Clone this repo and enter the directory `examples/web`
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2. Run `dart pub get`
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3. Run `dart pub global activate webdev`
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4. Run `webdev serve`
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||
|
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5. Navigate to http://localhost:8080/ in your browser
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||
|
|
|
||
|
|
### Command Line Examples
|
||
|
|
|
||
|
|
In order to run the command line example, please follow these steps:
|
||
|
|
|
||
|
|
1. Clone this repo and enter the directory
|
||
|
|
2. Run `pub get`
|
||
|
|
3. Run `dart examples/fibonacci/lib/example.dart 10`
|
||
|
|
|
||
|
|
### Flutter Example
|
||
|
|
|
||
|
|
#### Install Flutter
|
||
|
|
|
||
|
|
To run the flutter example, you must have Flutter installed. For installation instructions, view the online
|
||
|
|
[documentation](https://flutter.io/).
|
||
|
|
|
||
|
|
#### Run the app
|
||
|
|
|
||
|
|
1. Open up an Android Emulator, the iOS Simulator, or connect an appropriate mobile device for debugging.
|
||
|
|
2. Open up a terminal
|
||
|
|
3. `cd` into the `examples/flutter/github_search` directory
|
||
|
|
4. Run `flutter doctor` to ensure you have all Flutter dependencies working.
|
||
|
|
5. Run `flutter packages get`
|
||
|
|
6. Run `flutter run`
|
||
|
|
|
||
|
|
## Notable References
|
||
|
|
|
||
|
|
- [Documentation on the Dart Stream class](https://api.dart.dev/stable/dart-async/Stream-class.html)
|
||
|
|
- [Tutorial on working with Streams in Dart](https://www.dartlang.org/tutorials/language/streams)
|
||
|
|
- [ReactiveX (Rx)](https://reactivex.io/)
|
||
|
|
|
||
|
|
## Changelog
|
||
|
|
|
||
|
|
Refer to the [Changelog](https://github.com/ReactiveX/rxdart/blob/master/packages/rxdart/CHANGELOG.md) to get all release notes.
|
||
|
|
|
||
|
|
## Extensions
|
||
|
|
|
||
|
|
Check out [rxdart_ext](https://pub.dev/packages/rxdart_ext), which provides many extension methods and classes built on top of RxDart.
|
||
|
|
|
||
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|
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