inheritance and Object.create

gistfile1.js

// resources gathered around inheritance and Object.create
// http://ericleads.com/2012/09/stop-using-constructor-functions-in-javascript/
// https://speakerdeck.com/anguscroll/parlez-vous-javascript
// http://dailyjs.com/2012/06/04/js101-object-create/

// inheritance via prototype
// both constructors A, B are initialized
function A() {
  console.log("init A");
  this.log = "A";
}

function B() {
  console.log('init B');
  this.log = "B";
}

B.prototype.print = function () {
  console.log(this.log);
}

A.prototype = new B();
var a1 = new A();
a1.print();

// inheritance via Object.create
// D constructor not initialized
function C() {
  console.log('init C');
  this.log = 'C';
}

// D never executed
function D() {
  console.log('init D');
  this.log = "D";
}

D.prototype.print = function () {
  console.log(this.log);
}

C.prototype = Object.create(D.prototype);
var c = new C();
c.print();


// no constructors

var mixin = {
  print: function () {
    console.log(this.log);
  }
};

var createE = function createE() {
  return Object.create(mixin, {log: {value: "E"}});
};

var e = createE();
e.print();