JavaScript exercise 2

function Car(make, creed){
      this.wheels = 4;
      this.colour = "red";
      this.make = make;
      this.model = creed;
}

Car.prototype.getSummary = function(){
      return "this car has " + this.wheels + " wheels, is " +
      this.colour + ", manufactored by " + this.make + " and is a " + this.model;
};

var instance1 = new Car();
// set properties
instance1["make"] = "ford";
instance1.model = "mustang";

// check properties
console.log(instance1.getSummary());