Bridge Design Pattern

 // Implementor: Device

class Device {

constructor() {}

isEnabled() {}

enable() {}

disable() {}

getVolume() {}

setVolume(percent) {}

getChannel() {}

setChannel(channel) {}

}

// Concrete Implementor: TV

class TVDevice extends Device {

constructor(name) {

super();

this.enabled = false;

this.volume = 50;

this.channel = 1;

this.name =name;

}

isEnabled() {

return this.enabled;

}

enable() {

this.enabled = true;

}

disable() {

this.enabled = false;

}

getVolume() {

return this.volume;

}

setVolume(percent) {

this.volume = percent;

}

getChannel() {

return this.channel;

}

setChannel(channel) {

this.channel = channel;

}

}

// Concrete Implementor: Radio

class RadioDevice extends Device {

constructor(name) {

super();

this.enabled = false;

this.volume = 30;

this.channel = 100;

this.name = name;

}

isEnabled() {

return this.enabled;

}

enable() {

this.enabled = true;

}

disable() {

this.enabled = false;

}

getVolume() {

return this.volume;

}

setVolume(percent) {

this.volume = percent;

}

getChannel() {

return this.channel;

}

setChannel(channel) {

this.channel = channel;

}

}

// Abstraction: Remote

class Remote {

constructor(device) {

this.device = device;

}

togglePower() {

if (this.device.isEnabled()) {

this.device.disable();

console.log(`on ${this.device.name} Power Down Called`)

} else {

this.device.enable();

console.log(`on ${this.device.name} Power Up Called`)

}

}

volumeUp() {

this.device.setVolume(this.device.getVolume() + 10);

console.log(`on ${this.device.name} volumeUp called`)

}

volumeDown() {

this.device.setVolume(this.device.getVolume() - 10);

console.log(`on ${this.device.name} volumeDown called`)

}

channelUp() {

this.device.setChannel(this.device.getChannel() + 1);

console.log(`on ${this.device.name} channelUp called`)

}

channelDown() {

this.device.setChannel(this.device.getChannel() - 1);

console.log(`on ${this.device.name} channelDown called`)

}

}

// Usage

const tv = new TVDevice('MyTv');

const tvRemote = new Remote(tv);

const radio = new RadioDevice('MyRadio');

const radioRemote = new Remote(radio);

tvRemote.togglePower();

tvRemote.volumeUp();

tvRemote.channelUp();

radioRemote.togglePower();

radioRemote.volumeUp();

radioRemote.channelUp();