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How to use the BehaviorSubject function from rxjs

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

rxjs.BehaviorSubject is a type of observable in RxJS library that emits the most recent value to its subscribers upon subscription and continues to emit any new values.

taskRunner.js

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        log.info(msg(id, progress.defaultMessage))
        return progress
    })
)

const finalState$ = new BehaviorSubject(completedState)

return concat(
    of(initialState),
    progressState$.pipe(

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application.js

GitHub: particl/particl-desktop

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const { Observable, Subject, BehaviorSubject, of, timer } = require('rxjs');
const { auditTime, concatMap, tap, takeUntil } = require('rxjs/operators');
const settingsManager = require('./settingsManager');


let updateEmitter = new BehaviorSubject(false);
let checkerSubject;

const UPDATE_TIMEOUT = 1_800_000; // 30 minutes

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How does rxjs.BehaviorSubject work?

rxjs.BehaviorSubject is a type of Subject in RxJS that emits the most recent value to all new subscribers and keeps track of its current value. When a new subscriber subscribes to the BehaviorSubject, it immediately receives the last emitted value as its first notification. Under the hood, BehaviorSubject stores its current value as a private variable and exposes it through the getValue() method. Any time a new value is passed to the next() method, BehaviorSubject emits the new value to all of its subscribers.

rxChat.js

GitHub: CreativeBuilds/dlive-js

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const makeSocket = (blockchainUsername, returnWs) => {
  try {
    // User is in browser!
    const socket$ = new BehaviorSubject(null);

    const messages$ = new BehaviorSubject(null).pipe(filter(x => !!x));

    socket$.pipe(filter(x => !!x)).subscribe(ws => {
      ws.send(
        JSON.stringify({

+ 7 other calls in file

index.js

GitHub: jacobgoh101/web-scraping-with-rxjs

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    }),
    finalize(() => console.log('We are done!'))
  );
};

const allUrl$ = new BehaviorSubject(baseUrl);

const uniqueUrl$ = allUrl$.pipe(
  // only crawl IMDB url
  filter(url => url.includes(baseUrl)),

+ 3 other calls in file

Ai Example

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import { BehaviorSubject } from "rxjs";

const subject = new BehaviorSubject("initial value");

subject.subscribe({
  next: (value) => console.log(`Received value: ${value}`),
  error: (error) => console.error(`Error: ${error}`),
  complete: () => console.log("Completed!"),
});

subject.next("new value");

In this example, we create a new BehaviorSubject instance with an initial value of 'initial value'. We then subscribe to the subject and log any received values to the console. We also log any errors and completion events. Finally, we call next() on the subject to emit a new value of 'new value'. Since BehaviorSubject always emits the current value to new subscribers, the initial value of 'initial value' and subsequent value of 'new value' are both logged to the console.

tools.js

GitHub: Supamiu/ffxiv-teamcraft

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  }
}

const getAllPages = (endpoint, body, label) => {
  let progress;
  const page$ = new BehaviorSubject(1);
  const complete$ = new Subject();
  return page$.pipe(
    mergeMap(page => {
      let url = endpoint;

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+ 3 other calls in file

index.js

GitHub: lucasteles/reactivehooks

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    useSubscribe(rxInput.onValueChanges$, function (x) { return setValue(x); });
    return [value, function (newValue) { return setValue(newValue); }];
};
exports.useRxInputValue = useRxInputValue;
var createLoaderControl = function () {
    var subject = new rxjs_1.BehaviorSubject(false);
    return {
        start: function () {
            return function (x) {
                return x.pipe(operators_1.finalize(function () { return subject.next(false); }), operators_1.tap(function () { return subject.next(true); }));

subjective.ts

GitHub: otodockal/subjective

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    },
);

// BehaviorSubject
const productStateBS = new ProductState();
const stateBehaviorSubject = new BehaviorSubject(productStateBS);

// add tests
const suite = new Benchmark.Suite();
suite

temp.js

GitHub: zizifn/thoughts

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// import { distinctUntilChanged, distinct } from "rxjs/operators"
var equal = require('fast-deep-equal');
var rxjs = require('rxjs');
var rxjsOper = require('rxjs/operators');
var lodash = require('lodash')
var subject = new rxjs.BehaviorSubject({});


var b = {
    a: [1, '3', 4]

index.js

GitHub: caosbad/api

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exports.Observable = rxjs.Observable;
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;

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db.js

GitHub: Tzahi12345/YoutubeDL-Material

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const local_adapter = new FileSync('./appdata/local_db.json');
const local_db = low(local_adapter);

let database = null;
exports.database_initialized = false;
exports.database_initialized_bs = new BehaviorSubject(false);

const tables = {
    files: {
        name: 'files',

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Hardware.js

GitHub: votingworks/election-results-reporting

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    manufacturer: exports.OmniKeyCardReaderManufacturer,
    vendorId: exports.OmniKeyCardReaderVendorId,
    productId: exports.OmniKeyCardReaderProductId,
    serialNumber: '',
};
this.devicesSubject = new rxjs_1.BehaviorSubject(this.connectedDevices);
/**
 * Subscribe to USB device updates.
 */
this.devices = this.devicesSubject;

subject.js

GitHub: AkatQuas/kiddo-plays

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}


m3();


function m4() {
    const subject = new BehaviorSubject(0); // 0 is the initial value


    const subscription = subject.subscribe({
        next: (v) => console.log(`Behavior observerA: ${v}`)
    });

game-manager.test.js

GitHub: feugy/tabulous

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    action: new Subject(),
    cameraSaves: new Subject(),
    handMeshes: new Subject(),
    engine: new BehaviorSubject(),
    loadCameraSaves: vi.fn(),
    selectedMeshes: new BehaviorSubject([]),
    remoteSelection: new Subject()
  }
})
vi.mock('@src/stores/notifications')

+ 15 other calls in file

communicator.js

GitHub: temporary2565/custom-ap-encryption

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this.streamArr = streamArr
this.beaconsSubject = new BehaviorSubject([])
this.beaconsObs = this.beaconsSubject.asObservable()
this.errSubject = new BehaviorSubject(null)
this.errObs = this.errSubject.asObservable()
this.logSubject = new BehaviorSubject(null)
this.logObs = this.logSubject.asObservable()
this.syncStatusArr = []
this.failedRetBeacons = []
this.failedSync = []

+ 35 other calls in file

scraper.js

GitHub: piclouds/deal-scraper

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this.id = id;
this.frequency = frequency;
this.name = name;

// Data subject to notify changes
this.data$ = new rxjs.BehaviorSubject([]);

// Request latest items
this.getLatestItems();

+ 27 other calls in file

ring-device.js

GitHub: condagroup/ring-client-api

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function RingDevice(initialData, location, assetId) {
    var _this = _super.call(this) || this;
    _this.initialData = initialData;
    _this.location = location;
    _this.assetId = assetId;
    _this.onData = new rxjs_1.BehaviorSubject(_this.initialData);
    _this.zid = _this.initialData.zid;
    _this.id = _this.zid;
    _this.deviceType = _this.initialData.deviceType;
    _this.categoryId = _this.initialData.categoryId;

+ 60 other calls in file

ring-camera.js

GitHub: condagroup/ring-client-api

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_this.isDoorbot = isDoorbot;
_this.restClient = restClient;
_this.avoidSnapshotBatteryDrain = avoidSnapshotBatteryDrain;
_this.onRequestUpdate = new rxjs_1.Subject();
_this.onNewNotification = new rxjs_1.Subject();
_this.onActiveNotifications = new rxjs_1.BehaviorSubject([]);
_this.onDoorbellPressed = _this.onNewNotification.pipe((0, operators_1.filter)(function (notification) { return notification.action === ring_types_1.PushNotificationAction.Ding; }), (0, operators_1.share)());
_this.onMotionDetected = _this.onActiveNotifications.pipe((0, operators_1.map)(function (notifications) {
    return notifications.some(function (notification) { return notification.action === ring_types_1.PushNotificationAction.Motion; });
}), (0, operators_1.distinctUntilChanged)(), (0, operators_1.publishReplay)(1), (0, operators_1.refCount)());

+ 125 other calls in file

cjs.js

GitHub: gamfi/mysqldump

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    }
}
// eslint-disable-next-line complexity, import/no-default-export
function main(inputOptions) {
    let connection;
    const status = new rxjs.BehaviorSubject({ progress: 0, message: 'Initialing...' });
    const observable = status.asObservable();
    try {
        // assert the given options have all the required properties
        assert(inputOptions.connection, ERRORS.MISSING_CONNECTION_CONFIG);

+ 2 other calls in file

Web3Manager.js

GitHub: ACDI-Argentina/efem-dapp

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web3.providerName = "Http";
web3.networkId = this.config.network.requiredId;
web3.walletBrowserRequired = false; // Almacenamiento de Web3

if (!this.web3Subject) {
  this.web3Subject = new _rxjs.BehaviorSubject(web3);
} else {
  this.web3Subject.next(web3);
} // Almacenamiento de la dirección de la cuenta.

+ 3 other calls in file

common-utils.js

GitHub: technosoft-admin/LTSE_Attendance_APP

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// site inforamation  end
//----------- user type start ------------
this._userTypeCheck = new rxjs_1.BehaviorSubject(null);
// user type end
//--------- menu data fetch start ---------------
this._menudata = new rxjs_1.BehaviorSubject([]);
// menu data fetch end
//--------- menu permission fetch start ---------------
this._menuPermission = new rxjs_1.BehaviorSubject([]);
// menu permission fetch end

+ 299 other calls in file

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