Simple ES Javascript Plugin for Data Manager & Observer (Single state of truth)

ssz_data_manager_observer.js

class DataManager {
    _listeners = [];

    constructor(initialData) {
        this._data = initialData;
    }

    dispatch = (data) => {
        this._data = data;

        for (let listener of this._listeners) {
            listener(data)
        }
    }

    get data() {
        return this._data;
    }

    subscribe(callback) {
        this._listeners.push(callback);
        let from = this._listeners.length - 1;

        return () => {
            this._listeners.splice(from, 1)
        }
    }
}

let dataMgr = new DataManager({});

let unsubscribe = dataMgr.subscribe((data) => {
    console.log(data)
})

setInterval(() => {
    dataMgr.dispatch("This is a plain old message, there are many in this world, but this is mine")
}, 1000)

setTimeout(() => {
    unsubscribe()
}, 5000)