observer-subject

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.

type	data type	name	Description
parameter	object	observer	The object to be notified.
throws	Type Exception	n/a	Will throw an error if observer does not have a function named notify.

.unregisterObserver(observer)

Will no longer notify the specified observer.

type	data type	name	Description
parameter	object	observer	The object to be notified.
returns	boolean	n/a	true if the observer was found and removed, otherwise false

.notifyObservers(..args)

Calls each observers notify function with the arguments provided.

type	data type	name	Description
returns	boolean	n/a	true if game has ended, otherwise false.

observer.notify(...args)

Callback that the observable object uses to notify the observer.

type	data type	name	Description
parameter	...*	args	Arguments from the observable object.