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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>The factory pattern</title>
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<body>

<script id="jsbin-javascript">
/*A common implementation of this pattern is usually using
  a class or static method of a class.
  The purposes of such a class or method are as follows:
         - It abstracts out repetitive operations when creating
         similar objects
         - It allows the consumers of the factory to create
         objects without knowing the internals of the object creation
*/

//Car Factory Constructor
function CarFactory() {};
CarFactory.prototype.info = function() {
  console.log('This car has ' + this.doors + 'doors and a ' + this.engine_capacity + 'liter engine');
};

// The static Factory Method
CarFactory.make = function (type) {
  var constr = type, car;
  CarFactory[constr].prototype = new CarFactory();

  // Create a new instance
  car = new CarFactory[constr]();
  return car;

};

CarFactory.Compact = function () {
  this.doors = 4;
  this.engine_capacity = 2;
}

var golf = CarFactory.make('Compact');
console.log(golf);

</script>


<script id="jsbin-source-javascript" type="text/javascript">/*A common implementation of this pattern is usually using
  a class or static method of a class.
  The purposes of such a class or method are as follows:
         - It abstracts out repetitive operations when creating
         similar objects
         - It allows the consumers of the factory to create
         objects without knowing the internals of the object creation
*/

//Car Factory Constructor
function CarFactory() {};
CarFactory.prototype.info = function() {
  console.log('This car has ' + this.doors + 'doors and a ' + this.engine_capacity + 'liter engine');
};

// The static Factory Method
CarFactory.make = function (type) {
  var constr = type, car;
  CarFactory[constr].prototype = new CarFactory();

  // Create a new instance
  car = new CarFactory[constr]();
  return car;

};

CarFactory.Compact = function () {
  this.doors = 4;
  this.engine_capacity = 2;
}

var golf = CarFactory.make('Compact');
console.log(golf);
</script></body>
</html>