gistfile1.txt

function Car() {
    this.wheels = arguments[0];
    this.type = arguments[1];
}

function SportsCar() {
    this.speed = arguments[0];
}

SportsCar.prototype = new Car();
SportsCar.prototype.constructor = SportsCar;

var ferrari = new SportsCar('300km/h');
var fuscaoPreto = new Car(4, 'motor');

console.log(ferrari);
console.log(fuscaoPreto);
​