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hkwon/Observable.js

Created July 29, 2019 02:05
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  1. hkwon created this gist Jul 29, 2019.
    17 changes: 17 additions & 0 deletions Observable.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,17 @@
    module.exports = class Observable {
    constructor() {
    this._observers = new Set();
    }

    subscribe(observer) {
    this._observers.add(observer);
    }

    unsubscribe(observer) {
    this._observers = [...this._observers].filter(subscriber => subscriber !== observer);
    }

    notify(data) {
    this._observers.forEach(observer => observer(data));
    }
    };