Javascript oop. This example illustrates that es5 constructors and es6 classes are interoperable in an inheritance chain. So es6 classes are sugar syntax, while the prototype based inheritance is still the underlying implementation by the language.

parasitic-combination-inheritance.js

class Car {
  constructor (config) {
    this.make = config.make || 'Unknown';
    this.model = config.model || 'Unknown';
  }
  
  get price() {
    return this.price;
  }
  
  set price(price) {
    this.price = price;
  }
  
  print() {
    console.log(this.make + ' ' + this.model);
  }
  
  static getConstants() {
    return {one: 1};
  }
  
}

//
function SUV(config) {
  this.capacity = config.capacity || 2000;
  SUV.superclass.constructor.call(this, config);
}
  
SUV.superclass = Car.prototype;
SUV.prototype = Object.create(Car.prototype);
SUV.prototype.constructor = SUV;

SUV.prototype.print = function () {
  SUV.superclass.print.apply(this, arguments);
  console.log('Capacity: ' + this.capacity);
}

SUV.prototype.carryLuggage = function () {
  console.log(this.make + ' ' +  this.model +  ' carrying luggage..')  
}

SUV.prototype.canCarry = function (weight) {
  return weight <= this.capacity;
}

//
class LuxurySUV extends SUV {
  constructor(config) {
    super(config);
    this.features = config.features || [];
  }
  
  hasFeature(feature) {
    return this.features.indexOf(feature) >= 0; 
  }
  
  carryLuggage() {
    super.carryLuggage();
    console.log('with luxuries on the ride');
  }
}

var crv = new SUV({
  make: 'Honda',
  model: 'CRV',
  capacity: 3000
});

crv.print();
crv.carryLuggage();
crv.canCarry(5000);

var bmwX5 = new LuxurySUV({
  make: 'BMW',
  model: 'X5',
  capacity: 4000,
  features: ['leather_seat', 'e_drive']
});

bmwX5.carryLuggage();
console.log(bmwX5.hasFeature('e_drive'));
console.log(bmwX5.hasFeature('moon_roof'));


console.log(crv instanceof Car);
console.log(crv instanceof SUV);
console.log(Car.prototype.isPrototypeOf(crv));
console.log(SUV.prototype.isPrototypeOf(crv));

console.log(crv.constructor);
console.log(bmwX5.constructor);

console.log(bmwX5 instanceof Car);
console.log(bmwX5 instanceof SUV);
console.log(bmwX5 instanceof LuxurySUV);