JavaScript inheritance

function TXInstance(settings) {
  this.transmit = function(data) {
    // Transmit data using settings
  }
}

function RXInstance(settings) {
  this.receive = function(data) {
    // Receive data using settings
  }
}


function Device(settings) {
  this.settings = settings;
}

Device.prototype.asTransmitter = function() {
  this._txInstance = new TXInstance(this.settings);
  this.transmit = function(data) {
    this._txInstance.transmit(data);
  }
  return this;
}

Device.prototype.asReceiver = function() {
  this._rxInstance = new RXInstance(this.settings);
  this.receive = function(data) {
    this._rxInstance.receive();
  }
  return this;
}

Device.prototype.asTransceiver = function() {
  this.asTransmitter(this);
  this.asReceiver(this);
  return this;
}

var d = new Device({foo: 'bar'});
console.log(d);
var tx = new Device({foo: 'bar'}).asTransmitter();
console.log(tx);
var rx = new Device({foo: 'bar'}).asReceiver();
console.log(rx);
var txrx = new Device({foo: 'bar'}).asTransceiver();
console.log(txrx);