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How to use the ReplaySubject function from rxjs

Find comprehensive JavaScript rxjs.ReplaySubject code examples handpicked from public code repositorys.

rxjs.ReplaySubject is a type of Observable in RxJS that emits the last n values to its subscribers, even if they subscribe after the values have been emitted.

package-task.js

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                                                                  : createScopedPackageJSON(target, format),
                                            2);
    return Observable.forkJoin(
      observableFromStreams(gulp.src(metadataFiles), gulp.dest(out)), // copy metadata files
      observableFromStreams(gulp.src(`package.json`), jsonTransform, gulp.dest(out)) // write packageJSONs
    ).publish(new ReplaySubject()).refCount();
}))({});


module.exports = packageTask;
module.exports.packageTask = packageTask;

+ 9 other calls in file

cached.js

GitHub: nxtedition/nxt-lib

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return new Observable((o) => {
  let entry = cache.get(key)

  if (!entry) {
    const observable = bufferSize ? new ReplaySubject(bufferSize) : Subject()

    entry = {
      observable,
      subscription: fn(...args).subscribe(observable),

+ 3 other calls in file

How does rxjs.ReplaySubject work?

rxjs.ReplaySubject is a type of Observable in RxJS that allows its subscribers to receive the last n values emitted by the Observable, even if they subscribe after the values have been emitted. When a new rxjs.ReplaySubject is created, it is initialized with a buffer size that determines how many values it can store. Each time a new value is emitted, it is added to the buffer, and when a subscriber subscribes to the Observable, it immediately receives the last n values emitted, up to the buffer size. By default, rxjs.ReplaySubject emits all values in its buffer to a new subscriber. However, you can also specify the number of values to emit using the ReplaySubject constructor's bufferSize parameter. Additionally, you can specify a windowTime parameter to limit how long the ReplaySubject should keep values in the buffer, and a scheduler parameter to specify the Scheduler to use. One use case for rxjs.ReplaySubject is when you want to cache the results of an expensive operation, such as a network request. You can use a ReplaySubject to emit the cached results to subscribers, even if they subscribe after the results have been cached. Overall, rxjs.ReplaySubject is a powerful tool in RxJS that allows subscribers to receive the last n values emitted by an Observable, even if they subscribe after the values have been emitted. This can be useful in a variety of use cases, such as caching, and ensuring that subscribers always have access to the most recent data.

index.js

GitHub: caosbad/api

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exports.ConnectableObservable = rxjs.ConnectableObservable;
exports.GroupedObservable = rxjs.GroupedObservable;
exports.observable = rxjs.observable;
exports.Subject = rxjs.Subject;
exports.BehaviorSubject = rxjs.BehaviorSubject;
exports.ReplaySubject = rxjs.ReplaySubject;
exports.AsyncSubject = rxjs.AsyncSubject;
exports.asap = rxjs.asap;
exports.asapScheduler = rxjs.asapScheduler;
exports.async = rxjs.async;

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dev-server.js

GitHub: zxbodya/reactive-widgets

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    });
} else {
  devServerConfig.entry = devClient.concat(devServerConfig.entry);
}

const frontStatus$ = new ReplaySubject();
const frontEndCompiler = webpack(devServerConfig);
frontEndCompiler.plugin('compile', () => frontStatus$.next({ status: 'compile' }));
frontEndCompiler.plugin('invalid', () => frontStatus$.next({ status: 'invalid' }));
frontEndCompiler.plugin('done', (stats) => frontStatus$.next({ status: 'done', stats }));

+ 3 other calls in file

Ai Example

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const { ReplaySubject } = require("rxjs");

const subject = new ReplaySubject(2); // initialize with buffer size of 2

subject.subscribe({
  next: (value) => console.log(`Subscriber A received: ${value}`),
  complete: () => console.log("Subscriber A complete"),
});

subject.next("Value 1");
subject.next("Value 2");
subject.next("Value 3");

subject.subscribe({
  next: (value) => console.log(`Subscriber B received: ${value}`),
  complete: () => console.log("Subscriber B complete"),
});

subject.next("Value 4");
subject.complete();

In this example, we first import ReplaySubject from the rxjs library, and create a new instance of it with a buffer size of 2 using new ReplaySubject(2). We then subscribe to the subject Observable with Subscriber A, and emit three values with subject.next('Value'). Since the buffer size is 2, Value 1 and Value 2 are stored in the buffer, and both values are emitted to Subscriber A immediately. Value 3 is also added to the buffer, but is not emitted to any subscribers yet. We then subscribe to the subject Observable again with Subscriber B, and emit Value 4. Since the buffer size is 2, Value 3 and Value 4 are stored in the buffer, and both values are emitted to Subscriber B immediately. Finally, we complete the subject Observable with subject.complete(), which triggers the complete callback for both subscribers. When the code is run, the output will be: less Copy code

subject.js

GitHub: AkatQuas/kiddo-plays

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    subject.next(5);
}
m5();


function m6() {
    const subject = new ReplaySubject(100, 500 /* windowTime */);


    subject.subscribe({
        next: (v) => console.log(`replay with time observerA: ${v}`)
    });

index.cjs

GitHub: tristar123456/reactive_component_manager

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const {ReplaySubject, combineLatest, switchMap, startWith, shareReplay} = require('rxjs');
const {map} = require('rxjs/operators');


class ReactiveComponentManager {
	_events = {};
	_registerEvent$ = new ReplaySubject(1);
	listeners = this._registerEvent$.pipe(
		map((listeners) => Object.entries(listeners)),
		switchMap((listenersList) => combineLatest(listenersList.map((nameAndListener)=> nameAndListener[1].onEvent.pipe(startWith(undefined))))
			.pipe(

+ 135 other calls in file

rest-client.js

GitHub: condagroup/ring-client-api

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var _a;
this.authOptions = authOptions;
this.timeouts = [];
this.sessionPromise = undefined;
this.using2fa = false;
this.onRefreshTokenUpdated = new rxjs_1.ReplaySubject(1);
this.baseSessionMetadata = {
    api_version: apiVersion,
    device_model: (_a = this.authOptions.controlCenterDisplayName) !== null && _a !== void 0 ? _a : 'ring-client-api'
};

+ 64 other calls in file

streaming-session.js

GitHub: condagroup/ring-client-api

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__extends(StreamingSession, _super);
function StreamingSession(camera, connection) {
    var _this = _super.call(this) || this;
    _this.camera = camera;
    _this.connection = connection;
    _this.onCallEnded = new rxjs_1.ReplaySubject(1);
    _this.onUsingOpus = new rxjs_1.ReplaySubject(1);
    _this.onVideoRtp = new rxjs_1.Subject();
    _this.onAudioRtp = new rxjs_1.Subject();
    _this.audioSplitter = new camera_utils_1.RtpSplitter();

location.js

GitHub: condagroup/ring-client-api

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            return _this.receivedAssetDeviceLists.includes(asset.uuid);
        }));
}), (0, operators_1.shareReplay)(1));
_this.onSessionInfo = _this.onDataUpdate.pipe((0, operators_1.filter)(function (m) { return m.msg === 'SessionInfo'; }), (0, operators_1.map)(function (m) { return m.body; }));
_this.onConnected = new rxjs_1.BehaviorSubject(false);
_this.onLocationMode = new rxjs_1.ReplaySubject(1);
_this.onLocationModeRequested = new rxjs_1.Subject();
_this.reconnecting = false;
_this.disconnected = false;
_this.receivedAssetDeviceLists = [];

+ 2 other calls in file

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