es6 classes

classes.js

function ParentWidget(properties) {
  Object.assign(this, properties);
}

function farewell() {
  console.log('Goodbye Cruel ' + this.name);
}

ParentWidget.prototype.farewell = farewell;

function Widget(properties) {
  ParentWidget.call(this, properties);
}



Widget.prototype.prototype = ParentWidget.prototype

Object.assign(Widget.prototype, {
  farewell: function farewell() {
    ParentWidget.prototype.farewell();
  },
  
  greet: function greet() {
    console.log("Hello " + this.name);
  }
});

// usage:

var widget = new Widget({ name: 'Ben' });

widget.greet(); // Hello Ben
widget.farewell(); // Goodbye Cruel Ben

//es6

class ParentWidget {
  constructor(properties) {
    Object.assign(this, properties);
  }

  farewell() {
    console.log('Goodbye Cruel ' + this.name);
  }
}

class Widget extends ParentWidget {
  farewell() {
    super();
  }

  greet() {
    console.log("Hello " + this.name);
  }
}

widget.greet(); // Hello Ben
widget.farewell(); // Goodbye Cruel Ben