JavaScript "class"

javascript-classes

// naming a class
function Car(brand,model,powerOutput){
  var
    _brand = brand,
    _model = model,
    _spec = powerOutput > 200 ? 'race' : 'street';
    
  Object.defineProperties(this,{
    brand:{
      get: function (){ return _brand},
      set: function (brand){ _brand = brand},
      enumerable: true
    },
    model: {
      get: function (){ return _model},
      set: function (model){ _model = model},
      enumerable:true
    },
    spec: {
      get: function (){ return _spec},
      enumerable:true
    }
  });
  
  Object.seal(this);
}
// make the Car class non overwritable
Object.defineProperty(window, 'Car', { value: Car, enumerable: true, writable:false });

// inheritance
function FastCar(type){
  var 
    _type = type,
    _racer;
  
  Object.defineProperties(this, {
    type: {
      get: function () { return _type; },
      enumerable: true
    },
    racer:{
      get: function (){ return _racer;},
      set: function (v){ _racer = v;},
      enumerable: true
    }
  });
  // call father (super);
  Car.call(this,'Honda','Civic SI',202);
  // make this object non extensible
  Object.seal(this); 
}
FastCar.prototype = Object.create(Car.prototype,{constructor:{value:FastCar}});
Object.defineProperty(window, 'FastCar', { value: FastCar, enumerable: true, writable:false });

//make some Singleton
var CarType = (function (){
  var types = Object.create(Object.prototype);
  Object.defineProperties(types,{
    GT:{value:1},
    Prototype:{value:2},
    Dragster:{value:3},
    Monoposto:{value:4}
  });
  return types;
})();
Object.defineProperty(window, 'CarType', { value: CarType, enumerable: true, writable:false });