observer-subject v1.1.1

Observer Design Pattern Subject

An implementation of the subject in an Observer Design Pattern.

Example

let Observable = require('observer-subject'),
  subject = new Observable(),
  observer1 = {
    notify(...args) {

      console.log(`#1`, ...args);

    }

  },
  observer2 = {

    notify(...args) {

      console.log(`#2`, ...args);

    }

  };

subject.registerObserver(observer1);
subject.registerObserver(observer2);
subject.notifyObservers(42);
// #1 42
// #2 42

subject.unregisterObserver(observer1);
subject.notifyObservers(32);
// #2 32

Installation

$ npm install observer-subject

API

let Observer = require('observer-subject');

.registerObserver(observer)

Will start notifying the observer.

.unregisterObserver(observer)

Will no longer notify the specified observer.

.notifyObservers(..args)

Calls each observers notify function with the arguments provided.

observer.notify(...args)

Callback that the observable object uses to notify the observer.