Created
August 19, 2020 05:20
-
-
Save velotiotech/06814919d613a19c19bed4c04ec92fec to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Publisher | |
class Video { | |
constructor(observable, name, content) { | |
this.observable = observable; | |
this.name = name; | |
this.content = content; | |
// publish the ‘video-uploaded’ event | |
this.observable.publish('video-uploaded', { | |
name, | |
content, | |
}); | |
} | |
} | |
// Subscriber | |
class User { | |
constructor(observable) { | |
this.observable = observable; | |
this.intrestedVideos = []; | |
// subscribe with the event naame and the call back function | |
this.observable.subscribe('video-uploaded', this.addVideo.bind(this)); | |
} | |
addVideo(video) { | |
this.intrestedVideos.push(video); | |
} | |
} | |
// Observer | |
class Observable { | |
constructor() { | |
this.handlers = []; | |
} | |
subscribe(event, handler) { | |
this.handlers[event] = this.handlers[event] || []; | |
this.handlers[event].push(handler); | |
} | |
publish(event, eventData) { | |
const eventHandlers = this.handlers[event]; | |
if (eventHandlers) { | |
for (var i = 0, l = eventHandlers.length; i < l; ++i) { | |
eventHandlers[i].call({}, eventData); | |
} | |
} | |
} | |
} | |
// usage | |
const observable = new Observable(); | |
const user = new User(observable); | |
const video = new Video(observable, 'ES6 Design Patterns', videoFile); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment